Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1986-11-12
1988-05-24
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148102, H01F 104
Patent
active
047463783
ABSTRACT:
A process for producing an Sm.sub.2 Co.sub.17 alloy suitable for use as a permanent magnet, the alloy also containing iron, copper and zirconium or a similar group IVB or VB transition metal, and optionally praseodymium in partial replacement of the samarium. The process comprises providing the alloy in a preliminary form, sintering the alloy at an elevated temperature to achieve a high density and high remanence, selecting a solution heat treatment temperature which is marginally below the solid+liquid/solid phase transformation temperature of said alloy, cooling the sintered alloy body from the sintering temperature to the solution treatment temperature in a controlled manner to put the alloy constituents into a substantially uniform 2-17 Sm-Co solid solution, holding at the solid solution treatment temperature, quenching the alloy to room temperature, reheating the alloy to a first aging temperature to transform the 2-17 Sm-Co solid solution into a structure comprising a network of the 1-5 Sm-Co phase within a 2-17 Sm-Co matrix, cooling the alloy to a second aging temperature in a controlled manner to cause regions of 2-17 Sm-Co phase to nucleate coherently within the 1-5 Sm-Co phase network and create lattice strain which results in high coercivity and good loop squareness, and cooling the alloy to room temperature.
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Clegg Maurice A.
Fraser Robert W.
Wysiekierski Andrew G.
Delbridge Robert F.
Fors Arne I.
Sheehan John P.
Sherritt Gordon Mines Limited
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