关键词: 无压烧结;磁力搅拌;Ti3SiC2;AlF3

Abstract: Ternary carbide Ti3SiC2was synthesized by pressureless sintering the mixture powders with preliminary liquid magnetic stirring mixing, the influence of Ti/Si/C,Ti/SiC/C/and TiC/Si/Ti raw material systems on the synthesis of Ti 3SiC2was studied, the addition of appropriate Al or Sn to the synthesis process and final product were also evaluated.The powder was characterized with X-ray diffraction and scanning electron microscopy.The results show that high purity Ti 3SiC2was obtained by pressureless sintered 3Ti/1.2Si/2C/0.1Al at 1400 ℃, the addition of Al powder can reduce the initial reaction temperature of mixed powder and conducive the synthesis of high purity Ti 3SiC2, however, use TiC or SiC as Ti or Si source,the product has more impurities and is not suitable for the preparation of Ti3SiC2.After solvothermal reaction of Ti3SiC2in HF solution at 200 ℃, the products are mainly composed of two different crystal forms of SiC and AlF 3cube, along with the increase of reaction time, the content of AlF3increases and the crystallization is improved.

Key words: pressureless sintering;liquid magnetic stirring;Ti3SiC2;AlF3