Alumina ceramic comprising a siliceous binder and at least one of zirconia and hafnia
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United States of America Patent
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Nov 12, 1985
Grant Date -
N/A
app pub date -
Jun 27, 1984
filing date -
Jun 27, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ceramic composed of 1 to 15 percent of glass and 99 to 85 percent of a mixture of particulates is disclosed. The glass, present as a vitreous phase bonding the particulates into a dense, gas impervious structure, contains 45 to 80 percent of SiO.sub.2, 8 to 65 percent of CaO and MgO and not more than 15 percent of Al.sub.2 O.sub.3. The particulates, which are finer than 15 microns in ultimate particle size, include Al.sub.2 O.sub.3 and at least one of ZrO.sub.2, HfO.sub.2 and solid solutions of the two. The ceramics are subject to microcracking, which can be cured by refiring, or prevented by including particulate Y.sub.2 O.sub.3 as a stabilizer.
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