C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/1, 148/11
C22C 38/02 (2006.01) C22C 38/10 (2006.01)
Patent
CA 1222890
ABSTRACT: An invar alloy on the basis of iron is formed by an intermetallic compound having a cubic crystal struc- ture of the NaZnl3 type having a nominal composition La(Fe,Co,X)13, wherein X is Si or A1. By subjecting the present intermetallic compound after melting to a temper- ing treatment at 800-1,000°C and coolinq it in an accel- arated manner, a brittle material is obtained which can be ground to form a powder. From this powder, articles having any desired (optionally complicated) shape can be produced by means of powder metallurgy. By mixing powders of two different intermetallic compounds, a material can be obtained having a substantially negligible coefficient of linear thermal expansion in the temperature range from 0°C to 200 C.
446586
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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