Invar alloy on the basis of iron having a crystal structure of t

Details Invar alloy on the basis of iron having a crystal structure of t Invar alloy on the basis of iron having a crystal structure of t

1985-02-14

1986-04-15

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75228, 75249, B22F 100

Patent

active

045825351

ABSTRACT:
An Invar type alloy on the basis of iron is formed by an intermetallic compound having a cubic crystal structure of the NaZn.sub.13 type having a nominal composition La(FeCoX).sub.13, wherein X is Si or Al. By subjecting the present intermetallic compound after melting to a tempering treatment at 800.degree.-1,000.degree. C. and cooling it in an accelerated 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.degree. C. to 200.degree. C.

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