Refractory metal substrate and coatings therefor

Details Refractory metal substrate and coatings therefor Refractory metal substrate and coatings therefor

1988-01-25

1989-03-14

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

65 1, 6537412, 219 69E, 373 28, 373 30, 373 36, 420429, B32B 1501, C03B 542

Patent

active

048123722

ABSTRACT:
A refractory metal substrate suitable for use in contact with an oxygen- or nitrogen-containing environment at a temperature greater than the oxidation or mitridation acceleration temperature of the substrate is disclosed. The refractory metal substrate comprises a refractory metal comprised of molybdenum and having a coating comprised of chromium metal. In an alternative embodiment the refractory metal can be an alloy comprised of in weight percent: from about 10 to about 20 chromium, from about 0 to about 5 alumina (Al.sub.2 O.sub.3), from about 0 to about 1 yttria (Y.sub.2 O.sub.3), from about 0 to about 0.5 titanium, from about 0 to about 0.1 zirconium, the balance being essentially molybdenum to make 100% of the composition; and, optionally having a coating of chromium metal.

REFERENCES:
patent: 2018814 (1935-10-01), Smith
patent: 2144250 (1939-01-01), Allen et al.
patent: 2304297 (1942-12-01), Anton
patent: 3425116 (1969-02-01), Crooks et al.
patent: 3479161 (1969-11-01), Evans
patent: 4366571 (1982-12-01), Palmquist
patent: 4668262 (1987-05-01), Kithany
Harwood, "Protecting Molybdenum at High Temperatures", Materials and Methods, Reinhold Publishing Corp., Dec. 1956.

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