Materials resistant to metal and salt melts, their production and their use
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United States of America Patent
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Jul 5, 1988
Grant Date -
N/A
app pub date -
Nov 6, 1987
filing date -
Nov 18, 1986
priority date (Note) -
Expired
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Abstract
A material resistant to high temperature melts of metal and salt which comprises a composite material containing silicon nitride, silicon oxynitride, silicon dioxide and silicon prepared by (a) suspending silicon powder in SiO.sub.2 sol to form a pourable mass, (b) molding a workpiece from said mass, (c) hardening the molded workpiece, and (d) nitriding the hardened workpiece in a nitrogen atmosphere to form silicon nitride and silicon oxynitride to a degree that SiO.sub.2 and elemental silicon remain detectable in the nitrided workpiece, is useful as the material of construction for crucibles and tools for confining, handling and treating melts of metals or salts.
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