Vapor phase redistribution in multi-component systems

Details Vapor phase redistribution in multi-component systems Vapor phase redistribution in multi-component systems

1988-12-15

1990-07-24

Lechert, Jr, Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75236, 75241, 75244, 264125, 264332, 419 10, 419 15, 419 17, 419 19, 419 48, 419 49, 419 68, C22C 2912

Patent

active

049433202

ABSTRACT:
A process for preparing ceramic-metal composites without melting the metal is disclosed. A compact or green body is made from a ceramic and a metal, and the compact is sealed in a vacuum in a container such as a glass envelope. The compact is then heated to a temperature below the melting point of the metal, but high enough so that the vapor pressure of the metal is significant, and the metal redistributes through the ceramic by evaporation and condensation. The composite thereby forms a body having ceramic particles uniformly coated by the metal. Products formed by the process and fabrication of a B.sub.4 C/Cr composite are also disclosed.

REFERENCES:
patent: 4092263 (1978-05-01), Zavitsanos
patent: 4273582 (1981-06-01), Gutjahr et al
"The Chromium Diffusion Process," Product Finishing, v. 3, No. 10, pp. 32-37 (1950).
"Vapor Deposition," I. E. Campbell and C. F. Powell, Iron Age, 169, No. 15, pp. 113-117 (1952).

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