Optically transparent gamma-aluminum oxynitride powders and cera

Details Optically transparent gamma-aluminum oxynitride powders and cera Optically transparent gamma-aluminum oxynitride powders and cera

1996-07-19

1997-11-18

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Refractory

501 80, 501127, 501153, 501904, 501905, 423385, 423675, 423631, C04B 35581, C04B 35582

Patent

active

056887302

ABSTRACT:
Gamma-aluminum oxynitride ground powders, white in color and well suited for conversion into optically transparent ceramic shaped articles, 100% of the particles of which being less than 10 .mu.m in size and exhibiting a transmittance of at least 8%, are prepared by grinding particulate gamma-aluminum oxynitride agglomerates having a porosity of greater than 75%, such agglomerates themselves being produced by interreacting dry powdery admixture of aluminum nitride, alpha-alumina, and an alumina of high specific surface area or precursor thereof.

REFERENCES:
patent: 4241000 (1980-12-01), McCauley et al.
patent: 4481300 (1984-11-01), Hartnett et al.
patent: 4520116 (1985-05-01), Gentilman et al.
patent: 4686070 (1987-08-01), Maguire et al.
patent: 4720362 (1988-01-01), Gentilman et al.
patent: 4788167 (1988-11-01), Mathers et al.
patent: 4957886 (1990-09-01), Mathers et al.
patent: 5231062 (1993-07-01), Mathers et al.

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