Ceramic preforms comprising monocrystalline hexagonal platelets of alpha-alumina
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United States of America Patent
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Oct 6, 1998
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N/A
app pub date -
Jun 5, 1995
filing date -
May 23, 1990
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Abstract
Ceramic preforms comprising monocrystalline hexagonal platelets of .alpha.-alumina, well adopted for conversion into refractory bricks or ceramic composites, are prepared by crystallizing a settled fine powder of amorphous alumina, transition alumina or alumina hydrate, advantageously in the presence of a fluoro-compound flux, into a coherent mass of such hexagonal platelets of .alpha.-alumina.
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