C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
148/5
C22C 1/04 (2006.01) B22F 3/10 (2006.01) C22C 19/07 (2006.01) H01F 1/055 (2006.01)
Patent
CA 1237965
ABSTRACT OF THE DISCLOSURE A process for producing an Sm2Co17 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 praseo- dymium 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 be- low the solid+liquid/solid phase transformation tempera- ture of said alloy, cooling the sintered alloy body from the sintering temperature to the solution treatment tem- perature in a controlled manner to put the alloy consti- tuents into a substantially uniform 2-17 Sm-Co solid solution, holding at the solid solution treatment tem- perature, quenching the alloy to room temperature, re- heating the alloy to a first aging temperature to trans- form the 2-17 Sm-Co solid solution into a structure com- prising a network of the 1-5 Sm-Co phase within a 2-17 Sm-Co matrix, cooling the alloy to a second aging tem- perature 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.
474045
Clegg Maurice A.
Fraser Robert W.
Wysiekierski Andrew G.
Gowling Lafleur Henderson Llp
The Westaim Corporation
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