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JOURNAL OF SYNTHETIC CRYSTALS ›› 2022, Vol. 51 ›› Issue (7): 1275-1283.

• Research Articles • Previous Articles     Next Articles

Synthesis and Properties of Alumina Foam Ceramics with SiC Nanowires Braided Structure

LAN Fengyi1, YANG Minghao2, LAN Tian1, ZHANG Youfei1, LI Yongjiao1, XIA Zun1, WANG Xiuhui1, YANG Jinglong2   

  1. 1. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China;
    2. State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
  • Received:2022-04-02 Online:2022-07-15 Published:2022-08-11

Abstract: In this paper, Al2O3/Si foam ceramics with porosity up to 96% were prepared by simple and efficient slurry foaming method, and a large number of SiC nanowires were obtained in Al2O3/Si foam ceramics body by simple and convenient burying sintering process of coke. The growth morophology of SiC nanowires were observed and analyzed by controlling sintering temperature. The microstructure, phase composition, specific surface area, porosity, compressive strength and thermal conductivity of foam ceramics were analyzed and characterized by scanning electron microscope (SEM), X-ray diffractometer, BET specific surface area tester and electronic universal testing machine. The results show that the most SiC nanowires are obtained when sintered at 1 450 ℃. It is also observed that the presence of SiC nanowires change the inherent brittle fracture mode of alumina foam ceramics, and SiC nanowires can effectively promote its crack deflection during compression. In this study, a novel foam ceramics were prepared with three-dimensional network structure of nanowires wound on the hole wall, which provides a new method for in-situ growth of SiC nanowires inside the foam ceramics, and the application of foam ceramics in environmental filtration and catalyst carrier is expanded.

Key words: alumina foam ceramics, SiC nanowire, burying sintering, direct foaming method, sintering temperature, in-situ growth of nanowire, three-dimensional network structure

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