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Title:
SILICON NITRIDE SINTERED BODY, ROLLING BODY USING SAME, AND BEARING
Document Type and Number:
WIPO Patent Application WO/2022/050290
Kind Code:
A1
Abstract:
Provided are: a silicon nitride sintered body that has good mechanical properties, in particular fracture toughness, and has good product life when processed into a product; a rolling body using same; and a bearing. The silicon nitride sintered body includes a rare earth element and an aluminum element. The rare earth element content is 6%–13% by mass, in oxide terms, relative to the gross mass of the silicon nitride sintered body. The aluminum element content is 6%–13% by mass, in oxide terms, relative to the gross mass of the silicon nitride sintered body. A surface section, being a region within 2 mm of the surface of the silicon nitride sintered body, includes inclusions (I) and the total cross-sectional area ratio of the inclusions (I) relative to the total cross-sectional area of the surface section is at least 0.05%.

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Inventors:
NAKAMURA FUMIYA (JP)
HAYAKAWA YASUTAKE (JP)
Application Number:
PCT/JP2021/032051
Publication Date:
March 10, 2022
Filing Date:
September 01, 2021
Export Citation:
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Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
C04B35/596; B64C27/08; B64C27/14; B64D27/24; F16C19/02; F16C19/06; F16C33/32; F16C33/62
Domestic Patent References:
WO2015099148A12015-07-02
Foreign References:
JP2007297231A2007-11-15
JP2014129223A2014-07-10
JP2008285349A2008-11-27
JP2000256066A2000-09-19
JP2001192258A2001-07-17
JP2013234120A2013-11-21
JP2004149328A2004-05-27
JP2008247716A2008-10-16
JP2013049595A2013-03-14
Attorney, Agent or Firm:
WAKI Hikaru et al. (JP)
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