Fabrication of wood-like porous silicon carbide ceramics without templates |
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Authors: | Guangliang Liu Peiyun DaiYanzhong Wang Jianfeng YangYabin Zhang |
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Affiliation: | a State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, PR China b School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710032, PR China c Key Laboratory of Hollow Fiber Membrane Material and Membrane Process of Ministry of Education, Tianjin Polytechnic University, Tianjin 300160, PR China |
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Abstract: | The porous silicon carbide ceramics with wood-like structure have been fabricated via high temperature recrystallization process by mimicking the formation mechanism of the cellular structure of woods. Silicon carbide decomposes to produce the gas mixture of Si, Si2C and SiC2 at high temperature, and silicon gas plays a role of a transport medium for carbon and silicon carbide. The directional flow of gas mixture in the porous green body induces the surface ablation, rearrangement and recrystallization of silicon carbide grains, which leads to the formation of the aligned columnar fibrous silicon carbide crystals and tubular pores in the axial direction. The orientation degree of silicon carbide crystals and pores in the axial direction strongly depends on the temperature and furnace pressure such as it increases with increasing temperature while it decreases with increasing furnace pressure. |
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Keywords: | SiC Porous ceramics Microstructure Processing |
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