High temperature stable alumina and method of manufacturing the

Details High temperature stable alumina and method of manufacturing the High temperature stable alumina and method of manufacturing the

1997-09-26

1999-05-18

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Refractory

501153, C04B35/10

Patent

active

059050489

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.

REFERENCES:
patent: 5137853 (1992-08-01), Ichikawa et al.
T. Hirayama, "High-Temperature Characteristics of Transition A1.sub.2 O.sub.3 Powder with Ultrafine Spherical Particles", Communications of the American Ceramic Society, Jun. 1987, pp. C122-C124.
A. Kato et al., "Preparation of Lanthanum .beta.-Alumina with High Surface Area by Coprecipitation", Communications of the American Ceramic Society, Jul. 1987, pp. C157-C159.
"Surface Segregation & Morphology of Mg Dopd .delta.-Alumina Powders" Monieau et al. J Europ. Ceram Soc. (1995), 15(9), pp. 851-885.
"Surface Segregation, Microstructure and Sinterability of Alpha-Alumina Powders with Magnesium" Durak et al. Metall. Foundry Erg (1994), 20(2), 269-75, 203.

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