SOLID STATE THERMAL CONVERSION OF POLYCRYSTALLINE ALUMINA TOSAPPHIRE
SOLID STATE THERMAL CONVERSION OF POLYCRYSTALLINE ALUMINA TO SAPPHIRE 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 onehalf of the melting temperature...
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Main Authors | , , , |
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Format | Patent |
Language | English French |
Published |
25.03.1995
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Summary: | SOLID STATE THERMAL CONVERSION OF POLYCRYSTALLINE ALUMINA TO SAPPHIRE 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 onehalf 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. |
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Bibliography: | Application Number: CA19942132185 |