Synthesis of Al<sub>4</sub>SiC<sub>4</sub> Powders from Kaolin Grog, Aluminum and Activated Carbon as Raw Materials

Abstract

In Al-Si-C system, there are many compounds, of which Al 4 SiC 4 is useful as high-temperature structure material and the antioxidant in carbon-containing refractory. In this paper, Al 4 SiC 4 powders were synthesized by using kaolin grog, aluminum and activated carbon as raw materials. The phase changes of the synthesized samples were examined by X-ray diffraction (XRD), and the microstructure was observed by scanning electron microscope (SEM). The effects of synthesis temperature and the proportion of aluminum on phase compositions of Al-Si-C system were investigated. The results show plate-like Al 4 SiC 4 powders can be prepared with optimal ratio of starting materials and synthesis temperature.