Alumina sintered body and base substrate for optical device

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United States of America Patent

PATENT NO 10336625
APP PUB NO 20180044195A1
SERIAL NO

15797127

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Abstract

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An alumina sintered body according to the present invention includes a surface having a degree of c-plane orientation of 5% or more, the degree of c-plane orientation being determined by a Lotgering method using an X-ray diffraction profile obtained through X-ray irradiation at 2θ=20° to 70°. The alumina sintered body contains Mg and F, a Mg/F mass ratio is 0.05 to 3500, and a Mg content is 30 to 3500 ppm by mass. The alumina sintered body has a crystal grain size of 15 to 200 μm. When a field of view of 370.0 μm long×372.0 μm wide is photographed with a 1000-fold magnification and the photograph is visually observed, a number of pores having a diameter of 0.2 to 0.6 μm is 250 or less.

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Patent Owner(s)

Patent OwnerAddress
NGK INSULATORS LTDNAGOYA-SHI AICHI 467-8530

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Matsushima, Kiyoshi Nagoya, JP 9 11
Nanataki, Tsutomu Toyoake, JP 277 2653
Sato, Kei Tokai, JP 169 1090
Watanabe, Morimichi Nagoya, JP 46 407

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