High temperature-resistant material for devices used for forming glass optical elements with high surface quality
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United States of America Patent
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May 16, 1989
Issued Date -
N/A
app pub date -
Jun 9, 1987
filing date -
Jun 23, 1983
priority date (Note) -
Expired
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Abstract
Inorganic material resisting to high temperatures for installations intended to form structural glass elements which, owing to the precision and the quality of the forming surface, do not require after forming any other surface treatment. The material is comprised of at least one forming surface based on at least one from the groups of a metal oxide a double metal oxide, and a crystalline solid solution. It has a monocrystalline structure. Preferred materials are Al.sub.2 O.sub.3, Cr.sub.2 O.sub.3, MgAl.sub.2 O.sub.4 and/or ZrO.sub.2.
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