Features of the synthesis and consolidation of MeIVB2- (MeIV, Mo)Si2 ceramic powder for high-temperature applications

ZrB2-ZrSi2-MoSi2 and HfB2-HfSi2-MoSi2 composite ceramic powders were obtained by magnesiothermic SHS. The synthesized powders were consolidated by hot pressing in the temperature range of 1200-1250°C at 30 MPa. The structure and phase composition of the powders and compact ceramics were studied by X...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-06, Vol.558 (1)
Main Authors: Pogozhev, Yu S, Lemesheva, M V, Potanin, A Yu, Vershinnikov, V I, Levashov, E A
Format: Article
Language:English
Subjects:
Ceramic powders
Ceramics
Grain size
Hafnium compounds
High temperature
Hot pressing
Molybdenum disilicides
Phase composition
Rapid prototyping
Refractory materials
Sintering (powder metallurgy)
X ray powder diffraction
Zirconium compounds
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Summary:ZrB2-ZrSi2-MoSi2 and HfB2-HfSi2-MoSi2 composite ceramic powders were obtained by magnesiothermic SHS. The synthesized powders were consolidated by hot pressing in the temperature range of 1200-1250°C at 30 MPa. The structure and phase composition of the powders and compact ceramics were studied by X-ray powder diffraction analysis and scanning electron microscopy. ZrB2/HfB2, ZrSi2/HfSi2, ZrSi, and MoSi2 were the key phases of the ceramic powders and sintered ceramics. The average grain size of the powders after grinding was 6-8 μm. Saturation of the ZrSi phase with silicon and increased ZrSi2 content were observed during hot pressing. The dense ceramics had a residual porosity of 1.1-7.4%, which was largely dependent on the contents of silicides in SHS powders.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/558/1/012033