The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2013
Filed:
Jan. 27, 2009
Mitsuyoshi Nagano, Fukuoka, JP;
Masanobu Takasu, Fukuoka, JP;
Yo Arita, Yamaguchi, JP;
Satoru Sano, Yamaguchi, JP;
Mitsuyoshi Nagano, Fukuoka, JP;
Masanobu Takasu, Fukuoka, JP;
Yo Arita, Yamaguchi, JP;
Satoru Sano, Yamaguchi, JP;
Nippon Tungsten Co., Ltd., Fukuoka, JP;
Ube Material Industries, Ltd., Yamaguchi, JP;
Abstract
The invention provides a polycrystal magnesium oxide (MgO) sintered body which is capable of having a sintered density close to a theoretical density thereof. The MgO sintered body exhibits excellent mechanical properties and heat conductivity, while reducing contamination of an atmosphere due to gas generation. The invention also provides a production method for the sintered body. The polycrystal MgO sintered body has a unique crystalline anisotropy in which (111) faces are oriented along a surface applied with a uniaxial pressure at a high rate. The polycrystalline MgO sintered body is obtained by a method which includes the steps of: sintering an MgO raw material powder, having a particle size of 1 μm or less, under a uniaxial pressure and then subjecting the sintered powder to a heat treatment under an atmosphere containing 0.05 volume % or more of oxygen, at a temperature of 1273 K or more for 1 minute or more.