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

1984-01-27

1985-07-16

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123K, 75123L, 75246, 75245, 75124, C22C 3802

Patent

active

045294453

ABSTRACT:
An invar alloy on the basis of iron is formed by an intermetallic compound having a cubic crystal structure of the NaZn.sub.13 type having 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.

REFERENCES:
patent: 4279668 (1981-07-01), Kurz et al.
patent: 4374665 (1983-02-01), Koon
patent: 4409043 (1983-10-01), Koon

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