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Preparation method of near-zero expansion porous LAS/SiC composite material
Disclosed is a preparation method of a near-zero expansion porous LAS/SiC composite material. SiC powder with a matching diameter is adopted as a conditioning agent of a near-zero expansion LAS/SiC composite material; the thermal expansion coefficient of the composite material is subjected to macro-control by calculating a ratio; LAS/SiC compound powder is obtained; and finally the near-zero expansion porous LAS/SiC composite material is prepared via microwave sintering. The preparation method has advantages that: the microwave sintering is used for directly heating the inside of a matter via an electromagnetic field, wherein the heating is integral and uniform; the microwave sintering is high in thermal efficiency and sintering speed, and fast in heating rate; a blank directly skips a densification process and forms a sintering body during a sintering process; the sintering time is greatly shortened; and energy is greatly saved. What's more important is an SiC itself has high thermal conductivity and excellent microwave absorption ability (microwave dielectric property) and can be uniformly mixed with LAS to ensure heat distribution of the blank to be uniform in the sintering process. The diameter and distribution of formed pores of the LAS/SiC composite material are relatively uniform.
Preparation method of near-zero expansion porous LAS/SiC composite material
Disclosed is a preparation method of a near-zero expansion porous LAS/SiC composite material. SiC powder with a matching diameter is adopted as a conditioning agent of a near-zero expansion LAS/SiC composite material; the thermal expansion coefficient of the composite material is subjected to macro-control by calculating a ratio; LAS/SiC compound powder is obtained; and finally the near-zero expansion porous LAS/SiC composite material is prepared via microwave sintering. The preparation method has advantages that: the microwave sintering is used for directly heating the inside of a matter via an electromagnetic field, wherein the heating is integral and uniform; the microwave sintering is high in thermal efficiency and sintering speed, and fast in heating rate; a blank directly skips a densification process and forms a sintering body during a sintering process; the sintering time is greatly shortened; and energy is greatly saved. What's more important is an SiC itself has high thermal conductivity and excellent microwave absorption ability (microwave dielectric property) and can be uniformly mixed with LAS to ensure heat distribution of the blank to be uniform in the sintering process. The diameter and distribution of formed pores of the LAS/SiC composite material are relatively uniform.
Preparation method of near-zero expansion porous LAS/SiC composite material
WANG BO (author) / ZHANG HUI (author) / ZHANG YAMING (author) / DENG YUCHEN (author) / ZENG DEJUN (author) / GUO HAIXIA (author) / YANG JIANFENG (author)
2015-09-09
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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