US4099995A — Copper-hardened permanent-magnet alloy

Claim 1

Independent Claim 93 words

A coarse-grained, copper-hardened permanent-magnet alloy having the formula Sm(Co.sub.1-y Cu.sub.y).sub.6+x, wherein 0 ≦ x ≦ 1, and 0.15 < y < 0.35, which is prepared by a process which comprises melting together the mixed components cobalt, copper, and samarium in weight proportions according to the final desired formula: holding the melt at a temperature of about 1400° C for from 3 to 5 minutes: and subsequently solidifying the melt in situ by applying a cooling rate of less than 50° C/min. within the solidification temperature range of between 1300° C and 1200° C.

Claim 2

Dependent Claim 93 words

A coarse-grained, copper-hardened permanent-magnet alloy having the formula Sm(Co.sub.1-y Cu.sub.y).sub.6+x, wherein 0 ≦ x ≦ 1, and 0.15 < y < 0.35, which is prepared by a process which comprises melting together the mixed components cobalt, copper, and samarium in weight proportions according to the final desired formula: holding the melt at a temperature of about 1400° C for from 3 to 5 minutes: and subsequently solidifying the melt in situ by applying a cooling rate of less than 50° C/min. within the solidification temperature range of between 1300° C and 1200° C.

Claim 3

Dependent Claim 27 words

The copper hardened permanent magnet alloy of claim 1, which has the approximate composition Sm(Co 1-y Cu y ) 6 , wherein 0.15 < y < 0.35.

Claim 4

Dependent Claim 26 words

The copper-hardened permanent-magnet alloy of claim 1, which has the approximate composition Sm(Co 0 .75 Cu 0 .25) 6+x , wherein 0 ≦ x ≦ 1.

Claim 5

Dependent Claim 34 words

The alloy of claim 1 wherein said process further comprises heat treating said copper-hardened permanent-magnet alloy at a temperature between about 450° C and 650° C for about 2 hours, after said solidifying step.

Claim 6

Dependent Claim 77 words

The alloy of claim 1 wherein said process further comprises, after said solidifying step, comminuting and grinding the resultant copper-hardened permanent magnet alloy under an inert gas atmosphere to a particle size of from 4 to 20 μm; aligning it in a magnetic field of up to 40 kOe; compressing it to about 60% of its theoretical density at a pressure of 6000 atm; and then sintering it at a temperature between 1140° C and 1100° C.

Claim 7

Dependent Claim 93 words

A coarse-grained, copper-hardened permanent-magnet alloy having the formula Sm(Co.sub.1-y Cu.sub.y).sub.6+x, wherein 0 ≦ x ≦ 1, and 0.20 ≦ y ≦ 0.30, which is prepared by a process which comprises melting together the mixed components cobalt, copper, and samarium in weight proportions according to the final desired formula; holding the melt at a temperature of about 1400° C for from 3 to 5 minutes: and subsequently solidifying the melt in situ by applying a cooling rate of less than 50° C/min. within the solidification temperature range of between 1300° C and 1200° C.

Claim 8

Dependent Claim 93 words

A coarse-grained, copper-hardened permanent-magnet alloy having the formula Sm(Co.sub.1-y Cu.sub.y).sub.6+x, wherein 0 ≦ x ≦ 1, and 0.20 ≦ y ≦ 0.30, which is prepared by a process which comprises melting together the mixed components cobalt, copper, and samarium in weight proportions according to the final desired formula; holding the melt at a temperature of about 1400° C for from 3 to 5 minutes: and subsequently solidifying the melt in situ by applying a cooling rate of less than 50° C/min. within the solidification temperature range of between 1300° C and 1200° C.

Claim 9

Independent Claim 21 words

A method of preparing a coarse-grained, copper-hardened permanent-magnet alloy having the formula Sm(Co.sub.1-y Cu.sub.y).sub.6+x, wherein 0 ≦ x ≦ 1, and

Claim 10

Independent Claim 21 words

A method of preparing a coarse-grained, copper-hardened permanent-magnet alloy having the formula Sm(Co.sub.1-y Cu.sub.y).sub.6+x, wherein 0 ≦ x ≦ 1, and

Claim 11

Dependent Claim 70 words

15 < y < 0.35, which comprises: melting together the mixed components cobalt, copper, and samarium in weight proportions according to the final desired formula; holding the melt at a temperature of about 1400° C for from 3 to 5 minutes: and subsequently solidifying the melt in situ by applying a cooling rate of less than 50° C/min. within the solidification temperature range of between 1300° C and 1200° C.

Claim 12

Dependent Claim 70 words

15 < y < 0.35, which comprises: melting together the mixed components cobalt, copper, and samarium in weight proportions according to the final desired formula; holding the melt at a temperature of about 1400° C for from 3 to 5 minutes: and subsequently solidifying the melt in situ by applying a cooling rate of less than 50° C/min. within the solidification temperature range of between 1300° C and 1200° C.

Claim 13

Dependent Claim 25 words

The method of claim 7, wherein the copper-hardened permanent magnet alloy is further pulverized, aligned in a magnetic field, pressed and then solidified by sintering.

Claim 14

Dependent Claim 10 words

A permanent magnetic made from the alloy of claim 1.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1981-07-10	1982-01-09	1982-07-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1985-07-10	1986-01-09	1986-07-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1989-07-10	1990-01-09	1990-07-11	$7700.00	Window Closed / Lapsed

Copper-hardened permanent-magnet alloy

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