China's Refractories

《中国耐火材料》英文版

China's Refractories ›› 2025, Vol. 34 ›› Issue (3): 43-47.DOI: 10.19691/j.cnki.1004-4493.2025.03.007

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Preparation of Al4SiC4 by Hot Pressing Sintering with SiC as Raw Material

WEI Haoyu, WANG Li*, LIU Shijie, HUANG Ke, XU Yuting, JI Xiaoyu, MA Qing, ZHAI Yukun, WANG Caiyun   

  1. Luoyang Institute of Science and Technology, Luoyang 471023, China
  • Online:2025-09-15 Published:2025-09-24
  • Contact: *e-mail: wangli6433@sina.com
  • About author:Wei Haoyu, born in 2003, received his bachelor’s degree in inorganic nonmetallic materials engineering from Luoyang Institute of Technology in 2025. Currently, he is pursuing a master’s degree in materials and chemical engineering at Hubei University.

Abstract: In order to solve the problems of traditional long sintering time and relatively low density of synthesized Al4SiC4, Al4SiC4 was prepared via hot pressing sintering using aluminum powder, silicon carbide powder, flake graphite, and pretreated synthetic Al4C3 as raw materials. The phase composition of the Al4C3 specimen, which was prepared by pretreating aluminum powder and flake graphite at different temperatures, was investigated. The effects of the heat treatment temperature and duration on the phase composition, microstructure, physical properties, and oxidation resistance of the Al4SiC4 specimen were also explored. The results show that under the condition of firing at 1 650 °C for 3 h, the Al4SiC4 specimen exhibits an apparent porosity of 13.1%, a bulk density of 2.88 g·cm-3, a cold compressive strength as high as 63.23 MPa, and a mass loss rate of 1.2%. The preparation of relatively-high-density Al4SiC4 ceramics by hot pressing sintering has potential industrial application prospects.

Key words: hot pressing sintering, Al4SiC4, SiC, compressive strength