METHOD OF CARRING OUT VOLUMINOUS TRANSFORMATION OF POLYCRYSTALLINE CERAMIC BODY INTO A MONOCRYSTAL, ESPECIALLY OF POLYCRYSTALLINE ALUMINIUM OXIDE INTO SAPPHIRE AND ARTIFICIAL SAPPHIRE OBTAINED THEREBY
Polycrystalline alumina bodies have been converted to sapphire by a solid state conversion process in which a localized energy source is used to heat only a portion of the body to a temperature above 1800 DEG C. Using a laser as the energy source resulted in conversion to sapphire in less than an ho...
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Main Authors | , , , , , |
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Format | Patent |
Language | English Polish |
Published |
31.07.1998
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Edition | 6 |
Subjects | |
Online Access | Get full text |
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Summary: | Polycrystalline alumina bodies have been converted to sapphire by a solid state conversion process in which a localized energy source is used to heat only a portion of the body to a temperature above 1800 DEG C. Using a laser as the energy source resulted in conversion to sapphire in less than an hour. The polycrystalline alumina bodies had a magnesia content below 50 wppm, an average grain size below 100 microns, and a density greater than 3.97 g/cc. |
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Bibliography: | Application Number: PL19940303479 |