Influence of Nowonty Phase on the Fracture Toughness of SiC/MoSi2 Composites
MoSi2-SiC precursor powder has been synthesized via the mechanical alloy method with the elements Mo, Si and C powder. The SiC/MoSi2 composites with different SiC volume fraction have been prepared by reactive hot-pressing the precursor powder at 1350 °C. There is a significant increase in the fracture toughness due to addition of SiC reinforcement. However, the intermediary ternary phase exists in this system—namely, Mo5Si3C, Nowotny phase, which has negative effect on the fracture toughness, and can be eliminated through high temperature treatment at 1600 °C for 2 hrs.
Yu Zhou, Shan-Tung Tu and Xishan Xie
P. C. Kang et al., "Influence of Nowonty Phase on the Fracture Toughness of SiC/MoSi2 Composites ", Key Engineering Materials, Vols. 353-358, pp. 1326-1329, 2007