ALUMINA SINTERED BODY AND OPTICAL ELEMENT BASE SUBSTRATE

WIPO Patent Application WO/2016/182011

A1

This alumina sintered body: has a plane having a c-plane orientation of at least 5% as found by the Lotgering method and using an X ray diffraction profile in a range of 2θ = 20-70° when irradiating with X rays; includes Mg and F; has an Mg/F mass ratio of 0.05-3,500; has an Mg content of 30-3,500 ppm by mass; has a crystal particle diameter of 15-200 µm; and has no more than 50 pores having a diameter of at least 1 µm when a photograph is viewed in which a 1,340.4 × 1,607.0 µm (V × H) field of vision is captured at a magnification of 500 times. This alumina sintered body has a linear transmittance of at least 60% in a wavelength range of 300-1,000 nm, at a thickness of 0.5 mm. In other words, this alumina sintered body has excellent transparency because the linear transmittance is high even if the c-plane orientation is at least 5%.

MATSUSHIMA KIYOSHI (JP)
WATANABE MORIMICHI (JP)
SATO KEI (JP)
NANATAKI TSUTOMU (JP)

PCT/JP2016/064095

November 17, 2016

May 12, 2016

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NGK INSULATORS LTD (JP)

C01F7/02; C04B35/115; C01F7/442; G01N23/207; G02B1/02

WO2010082396A1

2010-07-22

JPS53112912A	1978-10-02
JP2001064075A	2001-03-13
JP2006310272A	2006-11-09
US20110039685A1	2011-02-17

HING, P.: "The Influence of Some Processing Parameters on the Optical and Microstructural Properties of Sintered Aluminas", SCIENCE OF CERAMICS, vol. 8, 1976, pages 159 - 172, XP001258323, ISSN: 0080-7575

ITEC INTERNATIONAL PATENT FIRM (JP)
Patent business corporation Itec international patent firm (JP)

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