Samarium-cobalt type magnet powder for resin magnet

Claim 2

A samarium-cobalt type magnet powder for use in making a resin magnet, said magnet powder consisting of, by weight of total powder, of 32.7 to 33.4% of samarium; 65.0 to 67.0% of cobalt, said samarium and said cobalt being present as a single phase of SmCo 5 ; up to 1.5% of an additive element selected from the group consisting of lanthanum, cerium, praseodymium and neodymium, at least one said additive element being present; and a balance of inevitably entrained impurities.

Claim 3

A magnet powder according to claim 1, wherein said inevitably entrained impurities comprise Ca.

Claim 4

a magnet powder according to claim 1, wherein said magnet powder as an average particle size in the range of 1 to 20 μm.

Claim 5

A magnet powder according to claim 3, wherein said average particle size is in the range of 5 to 10 μm.

Claim 6

A mixture of a samarium-cobalt type magnet powder with a resin for use in making a resin magnet, said magnet powder consisting of, by weight of total powder, of 32.7 to 33.4% of samarium; 65.0 to 67.0% of cobalt, said samarium and said cobalt being present as a single phase of SmCo 5 ; up to 1.5% of an additive element selected from the group consisting of lanthanum, cerium, praseodymium and neodymium, at least one said additive element being present; and a balance of inevitably entrained impurities; and said resin being selected from a thermoplastic resin and a thermosetting resin.

Claim 7

A mixture of a samarium-cobalt type magnet powder with a resin for use in making a resin magnet, said magnet powder consisting of, by weight of total powder, of 32.7 to 33.4% of samarium; 65.0 to 67.0% of cobalt, said samarium and said cobalt being present as a single phase of SmCo 5 ; up to 1.5% of an additive element selected from the group consisting of lanthanum, cerium, praseodymium and neodymium, at least one said additive element being present; and a balance of inevitably entrained impurities; and said resin being selected from a thermoplastic resin and a thermosetting resin.

Claim 8

A mixture according to claim 5, wherein said thermoplastic resin is at least one member selected from the group consisting of a polyamide resin, a polycarbonate resin, an acrylonitrile-butadiene-styrene copolymer resin, a polyphenylene sulfide resin, and a polyether ether ketone resin.

Claim 9

A mixture according to claim 5, wherein said thermoplastic resin is at least one member selected from the group consisting of an epoxy resin, a phenol resin, an amino resin, and an unsaturated polyester resin.

Claim 10

A samarium-cobalt type magnet powder for use in making a resin magnet, said magnet powder consisting of, by weight of total powder, of 32.7 to 33.4% of samarium; 65.0 to 67.0% of cobalt, said samarium and said cobalt being present as a single phase of SmCo 5 ; up to 1.5% of an additive element selected from the group consisting of lanthanum, cerium, praseodymium and neodymium, at least one additive element being present; and a balance of inevitably entrained impurities; said magnet powder being formed without a heat treatment by the steps of melting a mixture of said samarium, cobalt and additive element, casting said mixture into ingots, and pulverizing said ingots to form said magnet powder.

Claim 11

A samarium-cobalt type magnet powder for use in making a resin magnet, said magnet powder consisting of, by weight of total powder, of 32.7 to 33.4% of samarium; 65.0 to 67.0% of cobalt, said samarium and said cobalt being present as a single phase of SmCo 5 ; up to 1.5% of an additive element selected from the group consisting of lanthanum, cerium, praseodymium and neodymium, at least one additive element being present; and a balance of inevitably entrained impurities; said magnet powder being formed without a heat treatment by the steps of melting a mixture of said samarium, cobalt and additive element, casting said mixture into ingots, and pulverizing said ingots to form said magnet powder.

Claim 12

A samarium-cobalt type magnet powder for use in making a resin magnet, said magnet powder consisting of, by weight of total powder, of 32.7 to 33.4% of samarium; 65.0 to 67.0% of cobalt, said samarium and said cobalt being present as a single phase of SmCo 5 ; up to 1.5% of an additive element selected from the group consisting of lanthanum, cerium, praseodymium nd neodymium, at least one additive element being present; and a balance of inevitably entrained impurities; said magnet powder being formed without a heat treatment by the steps of forming a mixture of samarium oxide cobalt and additive element, subjecting said mixture to a reduction-diffusion reaction to form a reaction product, throwing said reaction product in cold water to produce a slurry, and adding water and an aqueous acid solution to said slurry to form said magnet powder.

Claim 13

A samarium-cobalt type magnet powder for use in making a resin magnet, said magnet powder consisting of, by weight of total powder, of 32.7 to 33.4% of samarium; 65.0 to 67.0% of cobalt, said samarium and said cobalt being present as a single phase of SmCo 5 ; up to 1.5% of an additive element selected from the group consisting of lanthanum, cerium, praseodymium nd neodymium, at least one additive element being present; and a balance of inevitably entrained impurities; said magnet powder being formed without a heat treatment by the steps of forming a mixture of samarium oxide cobalt and additive element, subjecting said mixture to a reduction-diffusion reaction to form a reaction product, throwing said reaction product in cold water to produce a slurry, and adding water and an aqueous acid solution to said slurry to form said magnet powder.