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2018-07-16

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Recently, the research team of the Institute of Silicon Technology, Chinese Academy of Sciences, proposed a sequential silicon infiltration method combining gas-phase and liquid-phase silicon infiltration. The mechanical properties of the final SiC ceramic prepared are equivalent to those of atmospheric pressure solid-phase sintered SiC ceramics, which can greatly improve the environmental temperature of SiC ceramics.

The relevant research results are published in J Eur. Ceram Soc. (Journal of the European Ceramic Society).

The application of silicon carbide structural components in emerging fields is expanding, but their extremely high hardness and significant brittleness make the preparation of large-sized, complex, and special-shaped precision SiC structural components more difficult. Therefore, the preparation technology of 3D printed SiC ceramics has become a hot topic. However, the low density and high silicon content of reaction sintered SiC ceramics prepared by 3D printing route result in lower usage temperature, which limits their performance and application.

The research team led by Huang Zhengren from the Shanghai Institute of Silicon Technology recently proposed a sequential silicon infiltration method that combines gas phase and liquid phase silicon infiltration. Through gas phase infiltration reaction, a porous SiC shell is formed, avoiding rapid and severe reactions of high carbon density ceramic printing bodies in the early stage of liquid phase silicon infiltration. At the same time, the contact area between liquid silicon and solid carbon is limited, so as not to block the infiltration channel, allowing subsequent liquid phase reactions to proceed slowly and continuously.

This study proposes a new strategy for manufacturing SiC composite materials through material extrusion combined with solvent degreasing and gas-liquid two-step silicon infiltration, avoiding the problems of slow degreasing speed and poor stability commonly found in direct thermal degreasing processes. The study also investigates the influence of temperature on the degreasing effect of kerosene solvent.