C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/119
C22C 38/00 (2006.01) B22F 1/02 (2006.01) C22C 33/02 (2006.01) H01F 1/22 (2006.01)
Patent
CA 1241556
- 35 - ABSTRACT OF THE DISCLOSURE As the raw material of a ferrous sintered alloy, a ferrous composite powder excellent in both compressibility and distribution of alloying elements is obtained by mixing an iron powder or a Sn-free low-alloy iron powder with at least one secondary powder comprising at least one of C, CO, Cr, Cu, Mn, Mo, Ni, P and Si and another powder comprising Sn and heating the powder mixture in a nonoxidizing atmosphere at 250-900°C to result in that the secondary powder(s) is at least partially bonded to the iron particles with Sn as a sort of cementing medium. In the powder mixture the content of Sn is 0.1-20 wt%, and the weight ratio of the secondary powder(s) to Sn is not greater than 50:1. Also disclosed is a ferrous sintered magnetic material high in magnetic flux density and small in iron loss, which contains 1-12 wt% of Si, 0.05-7 wt% of Sn and, optionally, 0.05-2 wt% of P and in which Sn concentrates on the surfaces of iron particles.
484070
Goudreau Gage Dubuc
Kawasaki Steel Corporation
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