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Preparation method of zero-expansion LAS/SiC composite material
Disclosed is a preparation method of a zero-expansion LAS/SiC composite material. The method comprises: firstly, preparing LAS powder via a powder sintering method; then adopting SiC powder with a matching diameter as a conditioning agent of the zero-expansion LAS/SiC composite material; calculating the ratio of LAS powder and SiC powder for macro-control of the thermal expansion coefficient of the composite material; and finally adopting a hot pressed sintering method and post-process treatment to prepare the zero-expansion LAS/SiC composite material. The composite material obtained in the invention is high in densification degree. A matrix is softened at a high temperature, so that densification is beneficial to perform. Further, the externally-applied pressure quickens the densification process, so that pores, which cannot be discharged in the absence of pressure, can be forced to be eliminated under the action of stress. Organization is homogenized; the pore ratio is reduced; and the strength of the composite material is improved.
Preparation method of zero-expansion LAS/SiC composite material
Disclosed is a preparation method of a zero-expansion LAS/SiC composite material. The method comprises: firstly, preparing LAS powder via a powder sintering method; then adopting SiC powder with a matching diameter as a conditioning agent of the zero-expansion LAS/SiC composite material; calculating the ratio of LAS powder and SiC powder for macro-control of the thermal expansion coefficient of the composite material; and finally adopting a hot pressed sintering method and post-process treatment to prepare the zero-expansion LAS/SiC composite material. The composite material obtained in the invention is high in densification degree. A matrix is softened at a high temperature, so that densification is beneficial to perform. Further, the externally-applied pressure quickens the densification process, so that pores, which cannot be discharged in the absence of pressure, can be forced to be eliminated under the action of stress. Organization is homogenized; the pore ratio is reduced; and the strength of the composite material is improved.
Preparation method of zero-expansion LAS/SiC composite material
WANG BO (author) / ZHANG HUI (author) / ZHANG YAMING (author) / GUO HAIXIA (author) / ZENG DEJUN (author) / DENG YUCHEN (author) / YANG JIANFENG (author)
2015-09-09
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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