Accession Number:

ADA244026

Title:

High Temperature Interactions of Metallic Matrices with Ceramic Reinforcements

Descriptive Note:

Final rept. 1 Dec 1987-31 Aug 1991

Corporate Author:

LOCKHEED MISSILES AND SPACE CO INC PALOALTO CA PALO ALTO RESEARCH LAB

Personal Author(s):

Report Date:

1991-08-31

Pagination or Media Count:

205.0

Abstract:

Advanced aerospace systems require low density materials with substantially improved high temperature mechanical properties and oxidation resistance. Metal matrices with ceramic reinforcements offer such potential. The primary objective of this research effort is to develop a scientific understanding of the nature and extent of interactions between these materials at high homologous temperatures. Part of this study is to understand these processes sufficiently well that diffusion barriers can be selected to control the interaction. Interfacial reactions of silicon carbides, aluminum oxides and silicon nitrides with selected high temperature metals have been studied at temperatures between 800 and 1200 C for various times. The metal include neodymium and tantalum strong carbide formers, cobalt, nickel, platinum, Ti3A1, and stainless steel. Reactions of the metals with SiC in this temperature range were extensive various metal sillicides, metal carbides, ternary metal-silicon- carbides, and unreacted carbon were formed as layered reaction products in the reaction zones. Thin films of A12O3 in the 100 to 500 nm thickness range are shown to be effective in minimizing the reaction between Nb and SiC.

Subject Categories:

  • Physical Chemistry
  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE