DEVELOPMENT OF MULLITE SUBSTRATES AND CONTAINERS Silicon Sheet Growth Development for the Large Area Silicon Sheet Task of the Low-Cost Silicon Solar Array Project Quarterly Report No. 3, April 1—July 15, 1978

摘要

Microstructural analysis of sessile drop experiments of silicon on mullite indicate reaction at the liquid solid interface which is especially severe after ten hours. Compositional variation including higher purity and elimination of the glass phase did not affect the reaction. The increased surface area of porous samples caused severe structural damage to these substrates. Reaction phases are found away from the interface after long exposure.nCompositional variations have been found to lower the thermal expansion of the mullite to the expansion of silicon. The addition of silica to a standard mullite body is found to increase the amount of glass phase while lowering expansion. It has also been found that a mixture of fused mullite and fused silica fires to a body with thermal expansion very near that of silicon-The thermal expansion of silicon was measured in the III crystal direction and found to concur with published data.