Accession Number:

ADA125968

Title:

Silicon Carbide Alloys.

Descriptive Note:

Final rept. 15 Dec 78-14 Sep 82,

Corporate Author:

UTAH UNIV SALT LAKE CITY DEPT OF MATERIALS SCIENCE AND ENGINEERING

Report Date:

1983-02-28

Pagination or Media Count:

6.0

Abstract:

SIC-AlN ceramics are fabricated by hot pressing a powder derived from carbothermal reduction of silica and alumina in nitrogen atm. Densities were greater than 99 theoretical. At high temp. a complete solid solution exists but at a low temp. below approx. 1800 C phase separation occurs by i Nucleation and growth, ii Cellular, and iii Spinodal mechanism. This indicates that a miscibility gap exists. Thermal conductivity, expansion coefficient, strength, fracture toughness and Youngs modulus were determined. Extensive electron microscopy was conducted.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Fabrication Metallurgy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE