Title

Study Program to Develop and Evaluate Die and Container Materials for the Growth of Silicon Ribbons

Abstract

Die and container material development efforts under the current program are shared among three organizations. Miami Research Laboratories (MRL) ceramic process development and overall program management, University of Missouri - Rolla (UMR) - silicon sessile drop studies with characterization of reaction products and emphasis on atmospheric effects, Chemetal Corporation, Pacoima, California - special coatings to be applied to test coupons, die shapes and containers provided by MRL and tested/characterized by UMR. Initial sessile drop experiments on SiC, Si3N4 and AlN have been conducted. Very promising results have been achieved on both SiC and Si3N4 where minimal penetration of these CNTD coatings by molten silicon was observed. Efforts during the past quarter continued in the following areas. At MRL, a set of AlN and another set of Si3N4 substrates have been hot pressed. Hot pressing experiments have begun on crucible shapes. Characterization efforts have also begun on coatings and substrates. Chemetal delivered AlN coated substrates and began development efforts to produce Si-0-N coatings as predecessor to Si-0-Al-N coatings. UMR has succeeded in measuring the lowest oxygen partial pressures measured, to the knowledge of the investigators, with a solid electrolyte cell on a dynamic flowing gas buffer system. This was achieved with a yttria doped thoria oxygen sensor cell. Even lower pressures beyond this measurement capability have been acheived.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Department of Energy

Document Type

Report - Technical

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1979 United States. Department of Energy, All rights reserved.


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