Aluminum nitride sintered body

Details Aluminum nitride sintered body Aluminum nitride sintered body

2006-07-25

2006-07-25

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

Reexamination Certificate

active

07081425

ABSTRACT:
An aluminum nitride sintered body having an oxygen concentration of not larger than 400 ppm, a metal impurity concentration of not larger than 150 ppm, and a carbon concentration of not larger than 200 ppm, and having an average crystal grain size of 2 μm to 20 μm. The sintered body exhibits particularly excellent optical properties such as an inclination of a spectral curve in the wavelength region of 260 to 300 nm of not smaller than 1.0 (%
m), a light transmission factor of not smaller than 86% in the wavelength region of 400 to 800 nm, and a wavelength of not longer than 400 nm when the light transmission factor reaches 60% in the spectrum.

REFERENCES:
patent: 6048813 (2000-04-01), Hunter
patent: 6486085 (2002-11-01), Katsuda et al.

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