Fabrication and Properties of Silicon Compounds.
Abstract
The hot-pressing behavior of SiC with additions of Al2O3 was investigated. It was found that a liquid phase was formed at temperatures > 1900C, which caused densification by a solution-reprecipitation mechanism. Al2O3 was identified as a second phase in the dense bodies. The phenomenon of pressureless sintering of Si3N4 (+ 5 wt % MgO) powders was studied. Densities of 90% theoretical and flexural strengths of 60,000 psi could be achieved. The densification behavior can be viewed as a competition between weight loss due to decomposition and shrinkage due to liquid phase sintering. The critical load required to induce surface damage into dense Si3N4 and SiC with a spherical indenter was determined. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 1973
- Accession Number
- AD0764639
Entities
People
- F. F. Lange
- G. R. Terwilliger