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Patents

Relating to Magnetic Materials and Assemblies and Methods of Production

Layered magnets and methods for producing same

PATENT NUMBER- 06850140 B1
PATENT DATE- 2005-02-01
INVENTOR(S) - Gleckner, Stephen Craig
ASSIGNEE- Magnetic Technologies Corporation, Rochester, NY

The present invention is directed to layered magnets, magnetic rolls made therefrom, methods for increasing the magnetic field strength of a ferritic magnet, methods for increasing the magnetic field strength of a magnetic roll, methods for increasing the magnetic field uniformity of a rare earth magnet, and methods for increasing the magnetic field uniformity of a magnetic roll. Layered magnets include a rare earth magnet having a magnetic field, and superposed upon the rare earth magnet, a layer of ferritic magnet bonded thereto. Layered magnets exhibit greater magnetic field strength and a substantially more uniform magnetic field.

Thermally stable, high temperature, samarium cobalt molding compound

PATENT NUMBER- 06737451
PATENT DATE- 2004-05-18
INVENTOR(S) - Carlberg, James; Nastas, Paul R.
ASSIGNEE- Arnold Engineering Company Ltd., Marengo, IL
A magnetic compound is formed comprising: (1) 25% to 50% by volume polyphenylene sulfide (PPS); (2) 50% to 70% by volume of coated samarium cobalt (the coating comprising 1 to 30% Kaolin by weight of the coating and 70 to 99% potassium silicate by volume of the coating); and (3) 0% to 5% of an internal lubricant. The PPS polymer component of the compound renders the compound amenable to be injection molded to precise tolerances and also has a low coefficient of linear thermal expansion. The samarium cobalt constituent of the compound provides thermal stability. The potassium silicate/kaolin coating separates the PPS from the samarium cobalt, thus preventing degradation (i.e. PPS viscosity reduction) during manufacture.

Permanent magnets and methods for their fabrication

PATENT NUMBER- 05781843
PATENT DATE- 1998-07-14
INVENTOR(S) - Anderson, Richard L.; Jones, Fred G.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

Novel permanent magnets of Sm sub 2 Co sub 17 type crystal structure are provided herein. The magnets preferably have samarium, cobalt, iron, copper and zirconium in specified amounts. They have superior magnetic properties, including maximum energy product, intrinsic coercivity and second quadrant loop squareness. The compositions of the magnets can be expressed by a general formula (Co sub a Fe sub b Cu sub c Zr sub d) sub e Sm. Preferred embodiments, wherein a is about 0.6 to about 0.7, b is about 0.2 to about 0.3, c is about 0.06 to about 0.07, d is about 0.02 to about 0.03, and e is about 7.2 to about 7.4, have unexpectedly high maximum energy product, high intrinsic coercive force and squareness. Processes for producing the improved alloy are also provided.

Methods for making magnetic strips

PATENT NUMBER- 05716460
PATENT DATE- 1998-02-10
INVENTOR(S) - Manning, Neil T.; Anderson Richard L.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a iron-based alloy having a manganese content of from about 8 to about 18 weight percent. The thin strips can be prepared by annealing the alloy, then cold rolling the alloy to reduce its thickness by at least about 40% to produce an initial strip, thermally treating the initial strip between about 400 degrees C. and its austenitizing temperature, cold rolling the initial strip to reduce its thickness by at least 75% to below about 0.005 inches, and thermally treating this strip at a temperature of at least 525 degrees C. for a period of time between about 0.1 and about 3 minutes. The strips are particularly useful in electronic article surveillance systems.

Gloves and implements containing a flexible magnetic strip to improve grip

PATENT NUMBER- 05715539
PATENT DATE- 1998-02-10
INVENTOR(S) - Benecki, Walter T.; Kosiek, Lawrence J.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

Ways to improve one's grip on an implement through the use of thin, flexible magnetic strips are provided. The flexible magnetic strips can be used with the glove worn by the person gripping the implement or with the implement's gripping surface, or with both. Alternatively, the flexible magnetic strips can be used with either the glove or the implement, with the opposing glove or implement surface coated or imbedded with a magnet attracting material. The user's grip is improved due to the magnetic interaction between the glove and the implement.

Magnetic strips and methods for making the same

PATENT NUMBER- 05653824
PATENT DATE- 1997-08-05
INVENTOR(S) - Manning, Neil R.; Anderson, Richard L.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips can be prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip. The strips can also be prepared by controlling the chemistry of the initial alloy and controlling the processing of that alloy until the desired thickness and requisite magnetic properties are obtained. The strips are particularly useful in EAS systems.

Magnetic strips and methods for making the same

PATENT NUMBER- 05611872
PATENT DATE- 1997-03-18
INVENTOR(S) - Manning, Neil R.; Anderson, Richard L.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than out 0.003 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips are prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip.

Magnetic strips and methods for making the same

PATENT NUMBER- 05527399
PATENT DATE- 1996-06-18
INVENTOR(S) - Manning, Neil R.; Anderson, Richard L.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strip can be prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip. The strips can also be prepared by controlling the chemistry of the initial alloy and controlling the processing of that alloy until the desired thickness and requisite magnetic properties are obtained. The strips are particularly useful in EAS systems.

Rare earth anisotropic magnetic materials for polymer bonded magnets

PATENT NUMBER- 05470400
PATENT DATE- 1995-11-28
INVENTOR(S) - Bogatin, Yakov; Robinson, Mark; Greenwald, Frank S.; Ormerod, J.
ASSIGNEE- SPS Technologies, Inc. Jenkintown, PA

This invention relates to a process for producing a non-pyrophoric, corrosion resistant rare earth-containing material capable of being formed into a polymer bonded permanent magnet comprising forming particles from a rare earth-containing alloy, and treating the alloy with a passivating gas comprised of nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide at a temperature below the phase transformation temperature of the alloy, and heat treating the alloy to produce material having a coercivity of at least 1,000 Oersteds. Rare earth-containing alloys suitable for use in producing magnets, such as Nd-Fe-B and Sm-Co alloys, can be used. If nitrogen is used as the passivating gas, the resultant powder particles have a nitrogen surface concentration of from about 0.4 to about 2 .8 atomic percent. Moreover, if carbon dioxide is used as the passivating gas, the resultant powder particles have a carbon surface concentration of from about 0.02 to about 15 atomic percent. The particles made in accordance with the present invention are capable of being aligned by a magnetic field to produce an anisotropic polymer bonded permanent magnet.

Method for making thin magnetic strips

PATENT NUMBER- 05431746
PATENT DATE- 1995-07-11
INVENTOR(S) - Manning, Neil R.; Anderson, Richard L.
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips are pre prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip.

Permanent magnets and methods for their fabrication

PATENT NUMBER- 05382303
PATENT DATE- 1995-01-17
INVENTOR(S) - Anderson, Richard L.; Jones, Fred G.
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

Novel permanent magnets of Sm sub 2Co sub 17 type crystal structure are provided herein. The magnets preferably have samarium, cobalt, iron, copper and zirconium in specified amounts. They have superior magnetic properties, including maximum energy product, intrinsic coercivity and second quadrant loop squareness. The compositions of the magnets can be expressed by a general formula Co sub a Fe sub b Cu sub c Zr sub d sub e Sm. Preferred embodiments, wherein a is about 0.6 to about 0.7, b is about 0.2 to about 0.3, c is about 0.06 to about 0.07, d is about 0.02 to about 0.03, and e is about 7.2 to about 7.4, have unexpectedly high maximum energy product, high intrinsic coercive force and squareness. Processes for producing the improved allay are also provided.

Process for making Nd-B-Fe type magnets utilizing a hydrogen and oxygen treatment

PATENT NUMBER- 05286307
PATENT DATE- 1994-02-15
INVENTOR(S) - Anderson, Richard L.
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

A process for preparing a permanent magnet is disclosed. The process comprises the steps of exposing material, in particulate form, and having an overall composition comprising 8 to 30 atomic percent of a first constituent selected from the group consisting of rare earth metals, 42 to 90 atomic percent of a second constituent selected from the group consisting of transition metals and 2 to 28 atomic percent of a third constituent selected from the group consisting of substances from Group III of the Periodic Table, to hydrogen gas under conditions such that hydrogen gas is absorbed by the material, exposing the hydrided material, in particulate form, to oxygen or an oxygen-containing gas in an amount and for a period of time sufficient to passivate the material, and compacting the material. Also disclosed are products from this process, namely, passivated, hydrided particles, alloy compacts formed of passivated, hydrided material and permanent magnets, having superior properties.

Magnetic materials and process for producing the same

PATENT NUMBER- 05266128
PATENT DATE- 1993-11-30
INVENTOR(S) - Bogatin, Yakov
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

This invention relates to a process for producing a rare earth-containing powder comprising crushing a rare earth-containing alloy in water, drying the crushed alloy material at a temperature below the phase transformation temperature of the material, and treating the crushed alloy material with a passivating gas at a temperature from the ambient temperature to a temperature below the phase transformation temperature of the material. Rare earth-containing alloys suitable for use in producing magnets utilizing the powder metallurgy technique, such as Nd-Fe-B and Sm-Co alloys, can be used. The passivating gas can be nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide. If nitrogen is used as the passivating gas, the resultant powder has a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent. Moreover, if carbon dioxide is used as the passivating gas, the resultant powder has a carbon surface concentration from about 0.02 to about 15 atomic percent. The present invention further relates to the production of a permanent magnet comprising the above steps for producing the rare earth-containing powder, and then compacting the powder, sintering the compacted material at a temperature of from about 900 degrees C. to about 1200 degrees C., and heat treating the sintered material at a temperature of from about 200 degrees C. to about 1050 degrees C.

Magnetic materials

PATENT NUMBER- 05227247
PATENT DATE- 1993-07-13
INVENTOR(S) - Bogatin, Yakov
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

This invention relates to a process for producing a rare earth-containing material capable of being formed into a permanent magnet comprising crushing a rare earth-containing alloy and treating the alloy with a passivating gas at a temperature below the phase transformation temperature of the alloy. This invention further relates to a process for producing a rare earth-containing powder comprising crushing a rare earth-containing alloy in a passivating gas at a temperature from ambient temperature to a temperature below the phase transformation temperature of the material. This invention also relates to a process for producing a rare earth-containing powder comprising crushing a rare earth-containing alloy in water, drying the crushed alloy material at a temperature below the phase transformation temperature of the material, and treating the crushed alloy material with a passivating gas at a temperature From the ambient temperature to a temperature below the phase transformation temperature of the material. Rare earth-containing alloys suitable for use in producing magnets utilizing the powder metallurgy technique, such as Nd-Fe-B and Sm-Co alloys, can be used. The passivating gas can be nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide. If nitrogen is used as the passivating gas, the resultant powder or compact has a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent. Moreover, if carbon dioxide is used as the passivating gas, the resultant powder or compact has a carbon surface concentration of from about 0.02 to about 15 atomic percent.

Magnetic materials

PATENT NUMBER- 05180445
PATENT DATE- 1993-01-19
INVENTOR(S) - Bogatin, Yakov
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

This invention relates to a process for producing a rare earth-containing powder comprising crushing a rare earth containing alloy in water, drying the crushed alloy material at a temperature below the phase transformation temperature of the material, and treating the crushed alloy material with a passivating gas at a temperature from the ambient temperature to a temperature below the phase transformation temperature of the material. Rare earth-containing alloys suitable for use in producing magnets utilizing the powder metallurgy technique, such as Nd-Fe-B and Sm-Co alloys, can be used. The passivating gas can be nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide. If nitrogen is used as the passivating gas, the resultant powder has a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent. Moreover, if carbon dioxide is used as the passivating gas, the resultant powder has a carbon surface concentration of from about 0.02 to about 15 atomic percent. The present invention further relates to the production of a permanent magnet comprising the above steps for producing the rare earth-containing powder, and then compacting the powder, sintering the compacted material at a temperature of from about 900 degrees C. to about 1200 degrees C., and heat treating the sintered material at a temperature of from about 200 degrees C. to about 1050 degrees C.

Process for making Nd-B-Fe type magnets utilizing a hydrogen and oxygen treatment

PATENT NUMBER- 05129964
PATENT DATE- 1992-07-14
INVENTOR(S) - Anderson, Richard L.
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

A process for preparing a permanent magnet is disclosed. The process comprises the steps of exposing material, in particulate form, and having an overall composition comprising 8 to 30 atomic percent of a first constituent selected from the group consisting of rare earth metals, 42 to 90 atomic percent of a second constituent selected from the group consisting of transition metals and 2 to 28 atomic percent of a third constituent selected from the group consisting of substances from Group III of the Periodic Table, to hydrogen gas under conditions such that hydrogen gas is absorbed by the material, exposing the hydrided material, in particulate form, to oxygen or an oxygen-containing gas in an amount and for a period of time sufficient to passivate the material, and compacting the material. Also disclosed are products from this process, namely, passivated, hydrided particles, alloy compacts formed of passivated, hydrided material and permanent magnets having superior properties.

Magnetic materials

PATENT NUMBER- 05122203
PATENT DATE- 1992-06-16
INVENTOR(S) - Bogatin, Yakov
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

This invention relates to a process for producing a rare earth-containing material capable of being formed into a permanent magnet comprising crushing a rare earth-containing alloy and treating the alloy with a passivating gas at a temperature below the phase transformation temperature of the alloy. This invention further relates to a process for producing a rare earth-containing powder comprising crushing a rare earth-containing alloy in a passivating gas at a temperature from ambient temperature to a temperature below the phase transformation temperature of the material. This invention also relates to a process for producing a rare earth-containing powder comprising crushing a rare earth-containing alloy in water, drying the crushed alloy material at a temperature below the phase transformation temperature of the material, and treating the crushed alloy material with a passivating gas at a temperature from the ambient temperature to a temperature below the phase transformation temperature of the material. Additionally, this invention relates to a process for producing a rare earth-containing powder compact comprising crushing a rare earth-containing alloy in water, compacting the crushed alloy material, drying the compacted alloy material at a temperature below the phase transformation temperature of the material, and treating the compacted alloy material with a passivating gas at a temperature from ambient temperature to a temperature below the phase transformation temperature of the material. Rare earth-containing alloys suitable for use in producing magnets utilizing the powder metallurgy technique, such as Nd-Fe-B and Sm-Co alloys, can be used. The passivating gas can be nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide. If nitrogen is used as the passivating gas, the resultant powder or compact has a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent. Moreover, if carbon dioxide is used as the passivating gas, e resultant powder or compact has a carbon surface concentration of from about 0.02 to about 15 atomic percent. The present invention further relates to the production of a permanent magnet comprising the above steps, and then sintering the compacted material at a temperature of from about 900 degrees C. to about 1200 degrees C., and heat treating the sintered material at a temperature of from about 200 degrees C. to about 1050 degrees C. An improved permanent magnet in accordance with the present invention can have a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent if nitrogen is used as a passivating gas. The improved permanent magnet can also have a carbon surface concentration of from out 0.02 to about 15 atomic percent if carbon dioxide is used as a passivating gas.

Magnetic materials and process for producing the same

PATENT NUMBER- 05114502
PATENT DATE- 1992-05-19
INVENTOR(S) - Bogatin, Yakov
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

This invention relates to a process for producing a rare earth-containing powder comprising crushing a rare earth-containing alloy in water, drying the crushed alloy material at a temperature below the phase transformation temperature of the material, and treating the crushed alloy material with a passivating gas at a temperature from the ambient temperature to a temperature below the phase transformation temperature of the material. Rare earth-containing alloys suitable for use in producing magnets utilizing the powder metallurgy technique, such as Nd-Fe-B and Sm-Co alloys, can be used. The passivating gas can be nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide. If nitrogen is used as the passivating gas, the resultant powder has a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent. Moreover, if carbon dioxide is used as the passivating gas, the resultant powder has a carbon surface concentration from about 0.02 to about 15 atomic percent. The present invention further relates to the production of a permanent magnet comprising the above steps for producing the rare earth-containing powder, and then compacting the powder, sintering the powder compacted material at a temperature of from about 900 degrees C. to about 1200 degrees C., and heat treating the sintered material at a temperature of from about 200 degrees C. to about 1050 degrees C. An improved permanent magnet in accordance with the present invention includes the type of permanent magnet comprised of, in atomic percent of the overall composition, from about 12% to about 24% of at least one rare earth element selected from the group consisting of neodymium, praseodymium, lanthanum, cerium, terbium, dysprosium, holmium, erbium, europium, samarium, gadolinium, promethium, thulium, ytterbium, lutetium, yttrium, and scandium, from about 2% to about 28% boron and at least 52% iron, wherein the improvement comprises a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent. The improved permanent magnet can also have a carbon surface concentration of from about 0.02 to about 15 atomic percent if carbon dioxide is used as a passivating gas.

Magnetic alloy compositions and permanent magnets

PATENT NUMBER- 04929275
PATENT DATE- 1990-05-29
INVENTOR(S) - Bogatin, Yakov
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

This invention relates to novel permanent magnet alloy compositions and high energy permanent magnets comprising from about 0.5 to about 27 atomic percent R wherein R is at least one rare earth element including Y and Sc, from about 0.1 to about 53 atomic percent A wherein A is at least one actinide element, and the balance being at least one metal wherein at least about 50 weight percent of the balance is at least one metal selected from the group consisting of Fe, Co, Ni, and Mn. Preferably, R is from about 12 to about 18 atomic percent and R is a rare earth element selected from the group consisting of Sm, Nd, Pr, and Dy. It is also preferred that A is from about 1 to about 5.1 atomic percent and A is an actinide element selected from the group consisting of Ac, Th, Pa and U. The balance is preferably at least about 90 weight percent of Fe and/or Co. and further comprises from about 0.1 to about 10 weight percent of Zr and/or Cu.

Process for producing permanent magnets

PATENT NUMBER- 04911882
PATENT DATE- 1990-03-27
INVENTOR(S) - Greenwald, Frank S.
ASSIGNEE- SPS Technologies, Inc. Newtown, PA

The present invention relates to the preparation of permanent magnet materials of the Iron-Boron-Rare Earth type. [Note: Exemplary Claims describe processing in a non-oxidizing or reducing atmosphere, using a mean particle size of 0.3 to 80 microns, and having a rare earth component composition of 12 to 24%. Additionally, the boron component concentration is between 4 and 24%. Parts are wet pressed in an orienting field, dried, and sintered between 900 and 1200 degrees C.]

Method for making magnetic rolls

PATENT NUMBER- 04640808
PATENT DATE- 1987-02-03
INVENTOR(S) - Okumura; Kunio (Hachioji, JP), Fukuyama; Yasuo (Uji, JP), Tanaka;
Atsuo (Yawata, JP)
ASSIGNEE- Yamauchi Rubber Industry Co., Ltd. (Osaka, JP)
REASSIGNED TO - Magnetic Technologies Corp., Rochester, NY
REASSIGNMENT DATE - 1987-05-15

Method for making magnetic rolls having a plurality of magnets integrally set fast with a retaining member at stated portions of the periphery of a roll shaft thereby forming a magnetic force generating part, in which the retaining member is made from a rigid synthetic resin or resin foam, and optionally having a strain absorbing groove at a portion outside of said magnetic force generating part are provided.

Magnet developer rolls

PATENT NUMBER- 04608737
PATENT DATE- 1986-09-02
INVENTOR(S) - Parks, Dale B.; Kosmider, Ronald T.
ASSIGNEE- Magnetic Technologies Corp., Rochester, NY

A magnet roll for use in a developer unit of an electrostatic copier having a magnet structure provided by elongated bars of permanent magnet material magnetized to provide radially oriented magnets. The bars are sufficiently rigid to support hubs without the need for a core. A cylindrical shell of conductive material is rotatably mounted on the magnet structure by shafts which are either journaled in or on the hubs of the magnet structure. The bars are made of conductive plastic or ceramic or elastomeric material (rubber) having permanent magnet material therein which is polarized to provide magnetic poles along the axis of the cylindrical shell which are magnetized in a radial direction with respect to the axis. The elastomeric (rubber) magnet bars have a rigid (steel) backing. The entire roll may be fabricated, essentially from plastic material and at low cost.

Magnetic particles and compacts thereof

PATENT NUMBER- 04177089
PATENT DATE- 1979-12-04
INVENTOR(S) - Bankson, Billye
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

Magnetic particles and compacts formed therefrom for use as magnetic cores formed of a blend of iron particles and particles of sendust, with the particles containing a coating of an electrical insulator thereon. The particles are compacted and annealed in the practice of this invention to form magnetic cores.

Magnetic alloy and processing thereof

PATENT NUMBER- 04120704
PATENT DATE- 1978-10-17
INVENTOR(S) - Anderson, Richard L.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

An iron-chromium-cobalt magnetic alloy characterized by good magnetic quality, improved hot and cold ductility and by a reduction in the minimum temperature for complete solutioning; and processing for producing said alloy. Hot ductility is improved through controlled additions of rare earth elements in conjunction with modified refining. Cold ductility is improved through a rapid cool subsequent to hot working and prior to cold working. Solutioning temperatures are lowered through controlled additions of vanadium and titanium.

Hysteresis alloy

PATENT NUMBER- 04021273
PATENT DATE- 1977-05-03
INVENTOR(S) - Handren, Ralph M.; McKay, John P.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

The invention relates to a novel alloy consisting essentially of 13-18% nickel, 7-11% aluminum, 0.5 to 10% cobalt, 0.1 to 2% silicon and the remainder substantially all iron, as is produced by heating the alloy composition to a temperature of about 1650 degrees C or above to form a melt and then casting the melt in a suitable mold. After solidification, the casting is heated to approximately 1150 degrees C, held at that temperature for a sufficient time to insure that the whole mass is heated uniformly, and then cooled at the rate of about 300 degrees C per minute. Parts are then given an aging for the purpose of producing uniform magnetic properties throughout the casting. Magnets thus cast, heat-treated and aged as aforesaid produce very stable magnetic properties with typical values of Br = 10,000, Hc = 150 and BHmax = .85. ; a further improvement in properties can be achieved by a second stage heat treatment wherein castings are heated to about 900 degrees C, held at this temperature for a sufficient time to assure that the whole mass is heated uniformly, and then cooled to about 600 degrees C at the rate of 60 degrees C per minute, followed by aging . Parts thus treated with the second stage heat treatment produce very stable magnetic properties with typical values of Br = 9,500, Hc = 230 and BHmax = 1.2. These properties are extremely well suited to many hysteresis torque producing devices.

Hysteresis alloy

PATENT NUMBER- 04007065
PATENT DATE- 1977-02-08
INVENTOR(S) - Handren, Ralph M.; McKay, John P.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

The invention relates to a novel alloy consisting essentially of 13-18% nickel, 7-11% aluminum, 0.5 to 10% cobalt, 0.1 to 2% silicon and the remainder substantially all iron, as is produced by heating the alloy composition to a temperature of about 1650 degrees C or above to form a melt and then casting the melt in a suitable mold. After solidification, the casting is heated to approximately 1150 degrees C, held at that temperature for a sufficient time to insure that the whole mass is heated uniformly, and then cooled at the rate of about 300 degrees C per minute. Parts are then given an aging for the purpose of producing uniform magnetic properties throughout the casting. Magnets thus cast, heat-treated and aged as aforesaid produce very stable magnetic properties with typical values of Br = 10,000, Hc = 150 and BHmax = .85. ; a further improvement in properties can be achieved by a second stage heat treatment wherein castings are heated to about 900 degrees C, held at this temperature for a sufficient time to assure that the whole mass is heated uniformly, and then cooled to about 600 degrees C at the rate of 60 degrees C per minute, followed by aging . Pxrts thus treated with the second stage heat treatment produce very stable magnetic properties with typical values of Br = 9,500, Hc = 230 and BHmax = 1.2. These properties are extremely well suited to many hysteresis torque producing devices.

Method for making c-shaped magnetizable core

PATENT NUMBER- 03969456
PATENT DATE- 1976-07-13
INVENTOR(S) - Graf, Richard B.; Chant, Jr., Edward H.; Marco, John F.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

A method for making a c-shaped magnetizable core powdered material manufactured by filling a predetermined quantity of the powdered material into a c-shaped mold having two open ends one end being smaller than the other open end and having a trapezoidal cross section, compressing said powdered material to a density of at least 6.0 g/cm sup 3 by a cooperating, c-shaped ram and a combined c-shaped closure-ejector element; the c-shaped ram entering the larger opening and moving toward the smaller opening which is closed by said closure-ejector element, withdrawing the ram and ejecting the core from the die with said closure-ejector element moving from the smaller opening toward the larger opening whereby the trapezoidal sides of the core are released simultaneously whereby the core uniformly expands in all directions as it is ejected from the die to produce a core having a uniform density and of improved structural, magnetic and electrical properties.

Error detection and correction apparatus for use in a magnetic tape system

PATENT NUMBER- 03803552
PATENT DATE- 1974-04-09
INVENTOR(S) - Rooney, Raymond R.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

A magnet assembly includes a permanent magnet having a pair of steel plates one fastened to each of its top and bottom sides. In one embodiment the magnet and plates are tubular with the inside diameter of the magnet being substantially greater than the inside diameter of the plates. A steel outer pole piece is secured to the inside opening of the plates in spaced relationship to a steel inner pole piece so as to provide an air gap therebetween. In another embodiment the plates are solid with the plates having a substantially greater diameter than the magnet. An inner steel pole piece is secured to the outer periphery of the plates in spaced relationship to an outer steel pole piece so as to provide an air gap therebetween. In each embodiment a coil is received in the air gap.

Method of stamping laminations

PATENT NUMBER- 03715943
PATENT DATE- 1973-02-13
INVENTOR(S) - Hirai, Robert K., Boomer, John H., Small, Edward R.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

The present invention is an improvement upon an earlier invention relating to a scrapless method of stamping E laminations from an endless strip of metal. The pattern in this particular method involves stamping small circular and semicircular apertures in the metal strip, respectively, at the regions where right angle die punches cluster and terminate at the edge of the metal strip so that there is no metal in the strip from which spurs may develop. Also, this differs from the previous inventions whereby the inner E's were stamped out first, leaving the outer edges of the strip to be cut off as small and large E laminations. In this invention the patent changes as follows: Two E's are removed from the outer edges of the strip, one small and one large, leaving the center of the strip as a skeleton to subsequently to chopped off as small and large E's.

Mill for rolling a thin, flat product

PATENT NUMBER- 03620362
PATENT DATE- 1971-12-21
INVENTOR(S) - Stone, J.J.
ASSIGNEE- The Arnold Engineering Company, Marengo, IL

A cluster-type rolling mill for rolling very thin sheet, strip or the like, which applies rolling force substantially over only the width of the rolled product thereby eliminating roll flexing forces conventionally existing in the rolls outside the width of the rolled product.