Vaporization Behavior of Silicon Nitride.
Final rept. 1 Jan-31 Dec 72,
CINCINNATI UNIV OHIO DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING
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The vaporization of Si3N4 was studied to determine the gaseous products and the composition of the remaining solid phase. The gas phase above Si3N4 was found to consist mainly of N2, but Si also at mass 28 was detected. Solid Si3N4 cubes of better than 99 theoretical density were heated in a boron nitride Knudsen cell for various lengths of time. The Knudsen cell was in a temperature gradient, the top about 50C cooler than the bottom, so that the free silicon would condense on it. Following heating, the weight loss of the cubes and the silicon collected on the lid was determined, and the silicon nitride to silicon ratio in the solid phase determined. This ratio was also determined using x-ray diffraction techniques. Modified author abstract
- Physical Chemistry
- Ceramics, Refractories and Glass