Title:
SILICON NITRIDE POWDER AND METHOD FOR PRODUCING SILICON NITRIDE SINTERED BODY
Document Type and Number:
WIPO Patent Application WO/2023/176893
Kind Code:
A1
Abstract:
The present invention provides a crystalline silicon nitride powder which is easily sinterable and enables the achievement of a silicon nitride sintered body that has excellent sintered body characteristics such as high-temperature strength. The present invention also provides a crystalline silicon nitride powder which enables the production of a silicon nitride sintered body that has excellent thermal conductivity, while having sufficient mechanical strength. The present invention also provides a method for producing a silicon nitride sintered body which has both high bending strength and excellent thermal conductivity at the same time. This crystalline silicon nitride powder is characterized in that: the specific surface area (SA) as determined by a BET method is 3 m2/g to 16 m2/g; the surface oxygen amount (FSO) as determined by temperature-programmed morphology analysis is 0.2% by mass to 0.6% by mass; the internal oxygen amount (FIO) as determined by temperature-programmed morphology analysis is 0.4% by mass to 1.3% by mass; the ratio (FSO/SA) of the surface oxygen amount to the BET specific surface area is not less than 0.25 mg/m2 but less than 0.50 mg/m2; and the median diameter D50 in the volume-based cumulative particle size distribution as determined by a laser diffraction/scattering method is 0.5 µm to 1.0 µm.
Inventors:
OHMARU TAKUJI (JP)
SHIBATA KOJI (JP)
FUJII TAKAYUKI (JP)
YAMADA TETSUO (JP)
SHIBATA KOJI (JP)
FUJII TAKAYUKI (JP)
YAMADA TETSUO (JP)
Application Number:
PCT/JP2023/010125
Publication Date:
September 21, 2023
Filing Date:
March 15, 2023
Export Citation:
Assignee:
UBE CORP (JP)
International Classes:
C01B21/068; C04B35/587
Domestic Patent References:
| WO2015005390A1 | 2015-01-15 | |||
| WO2013146713A1 | 2013-10-03 |
Foreign References:
| JPH07206409A | 1995-08-08 | |||
| JPH08119609A | 1996-05-14 | |||
| JPH0812306A | 1996-01-16 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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