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Method for preparing Si3N4-O'-Sialon-TiN ceramic ball material
The invention discloses a method for preparing a Si3N4-O'-Sialon-TiN ceramic ball material. Si3N4 powder is used as a raw material, Al2O3-Re2O3-TiO2-SiO2 is used as a sintering aid, Si3N4, Al2O3-Re2O3-SiO2 and TiO2 are mixed and dried in mass fraction respectively, and then Si3N4-Al2O3-Re2O3-SiO2-TiO2 mixed powder is obtained; the mixed powder is heated to the temperature of 1600-2000 DEG C through air pressure sintering, the temperature is kept for 0.5-4 h, the nitrogen pressure in the whole sintering process is 0.1-10 MPa, and the Si3N4-O'-Sialon-TiN ceramic ball material is obtained. The ceramic ball material prepared with the method has the relative density higher than 95%, the hardness ranging from 10 GPa to 22 GPa, the fracture toughness ranging from 3 MPam1/2 to 8 MPam1/2, the bending strength ranging from 600 MPa to 1200 MPa and the TiN particle size ranging from 20 nm to 1000 nm; Al2O3-Re2O3-SiO2 is introduced to improve Si3N4 densification and produce O'-Sialon, nano TiO2 is introduced to realize in-situ production of nano TiN, and the Si3N4-O'-Sialon-TiN ceramic ball material is obtained.
Method for preparing Si3N4-O'-Sialon-TiN ceramic ball material
The invention discloses a method for preparing a Si3N4-O'-Sialon-TiN ceramic ball material. Si3N4 powder is used as a raw material, Al2O3-Re2O3-TiO2-SiO2 is used as a sintering aid, Si3N4, Al2O3-Re2O3-SiO2 and TiO2 are mixed and dried in mass fraction respectively, and then Si3N4-Al2O3-Re2O3-SiO2-TiO2 mixed powder is obtained; the mixed powder is heated to the temperature of 1600-2000 DEG C through air pressure sintering, the temperature is kept for 0.5-4 h, the nitrogen pressure in the whole sintering process is 0.1-10 MPa, and the Si3N4-O'-Sialon-TiN ceramic ball material is obtained. The ceramic ball material prepared with the method has the relative density higher than 95%, the hardness ranging from 10 GPa to 22 GPa, the fracture toughness ranging from 3 MPam1/2 to 8 MPam1/2, the bending strength ranging from 600 MPa to 1200 MPa and the TiN particle size ranging from 20 nm to 1000 nm; Al2O3-Re2O3-SiO2 is introduced to improve Si3N4 densification and produce O'-Sialon, nano TiO2 is introduced to realize in-situ production of nano TiN, and the Si3N4-O'-Sialon-TiN ceramic ball material is obtained.
Method for preparing Si3N4-O'-Sialon-TiN ceramic ball material
GUO WEIMING (author) / YU JUNJIE (author) / LIN HUATAI (author)
2016-01-20
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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