High temperature stable alumina and method of manufacturing the same
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United States of America Patent
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May 18, 1999
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app pub date -
Sep 26, 1997
filing date -
Sep 26, 1996
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Expired
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Abstract
To provide a high-temperature stable transition-type alumina that does not undergo transformation into .alpha.-alumina even at high-temperature exceeding 1300.degree. C., and a method for producing the transition-type alumina. A metal aluminum block is placed on a block of .alpha.-alumina composed of Al.sub.2 O.sub.3. Portions of the .alpha.-alumina block and the metal aluminum block close to their boundary was strongly heated by contacting the flame of burning gas with the portions. Alumina and a relatively small amount of magnesium are thereby vaporized, and allowed to react with oxygen in the atmosphere, thereby obtaining a transition-type alumina that contains a small amount of magnesium in the crystal structure. The transition-type alumina obtained by this method is substantially of single crystal type, and does not undergo transformation into .alpha.-alumina even at high temperatures exceeding 1300.degree. C. and, further, exceeding 1400, but retains a complete transition-type crystal configuration such as .delta.-alumina and .theta.-alumina and the like.
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