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:
Oct. 03, 2017
Filed:
Mar. 09, 2016
Applicant:
Ngk Insulators, Ltd., Nagoya, JP;
Inventors:
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 35/185 (2006.01); C04B 35/645 (2006.01); C04B 37/00 (2006.01); C04B 37/02 (2006.01);
U.S. Cl.
CPC ...
C04B 35/185 (2013.01); C04B 35/645 (2013.01); C04B 37/001 (2013.01); C04B 37/008 (2013.01); C04B 37/02 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/6562 (2013.01); C04B 2235/6565 (2013.01); C04B 2235/6586 (2013.01); C04B 2235/77 (2013.01); C04B 2235/785 (2013.01); C04B 2235/96 (2013.01); C04B 2235/963 (2013.01); C04B 2235/9646 (2013.01); C04B 2235/9653 (2013.01); C04B 2237/34 (2013.01); C04B 2237/55 (2013.01); C04B 2237/72 (2013.01);
Abstract
A mullite sintered body according to the present invention has an impurity element content of 1% by mass or less and contains sintered mullite grains having an average grain size of 8 μm or less. When a surface of the mullite sintered body is finished by polishing, pores in the surface have an average largest pore length of 0.4 μm or less. The surface preferably has a center line average surface roughness (Ra) of 3 nm or less. The surface preferably has a maximum peak height (Rp) of 30 nm or less. The number of pores in the surface is preferably 10 or less per unit area of 4 μm×4 μm.