发明名称 |
SOLID STATE THERMAL CONVERSION OF POLYCRYSTALLINE ALUMINA TOSAPPHIRE |
摘要 |
A solid state process for the bulk conversion of a dense polycrystalline ceramic body to a single crystal body has been accomplished by heating the polycrystalline material to a temperature above one-half of the melting temperature of the material but below the melting point of the material. As the process is a solid state process, no melting of the ceramic body is necessary to convert it to a single crystal. The process has been used to convert a dense polycrystalline alumina body (PCA) containing less than 100 wppm of magnesia to sapphire (single crystal alumina) by heating the PCA to temperatures above 1100.degree.C but below 2050.degree.C, the melting point of alumina. |
申请公布号 |
CA2132185(C) |
申请公布日期 |
2006.05.09 |
申请号 |
CA19942132185 |
申请日期 |
1994.09.15 |
申请人 |
GENERAL ELECTRIC COMPANY;MONSANTO COMPANY |
发明人 |
SCOTT, CURTIS E.;LEVINSON, LIONEL M.;MAXWELL, RANDOLPH E.;KALISZEWSKI, MARY SUE |
分类号 |
C04B35/115;C30B1/02;C30B1/04;C30B1/10;C30B29/20;C30B29/66 |
主分类号 |
C04B35/115 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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