Preparation and Characterization of SiC/MoSi2 Composites from Powder Resulting from A Mechanical-Assistant Combustion Synthesis Method
SiC reinforced MoSi2 composites have been successfully prepared by pressureless sintering from mechanical-assistant combustion synthesized powders.The sintering temperatures and holding time were 1500℃~1650℃ at a heating rate of 10K/min and 1 hour,respectively.The microstructure and mechanical properties of the as-sintered composites were investigated.SEM micrographs of SiC/MoSi2 composites showed that SiC particles were homogeneously distributed in MoSi2 matrix.The Vickers hardness,flexural strength and fracture toughness of the SiC/MoSi2 composites were up to 15.50GPa,468.7MPa and 9.35MPa·m1/2,respectively.The morphologies of fractured surface of the composites revealed the mechanism to improve mechanical properties of MoSi2 matrix.At last,the cyclic oxidation behavior of the composites was discussed.The results of this work showed that in situ SiC/MoSi2 composite powder prepared by MASHS technique could be successfully sintered via pressureless sintering process and significant improvement of room temperature mechanical and anti-oxidation properties could be achieved.
MoSi2 Mechanical properties Cyclic oxidation behavior Pressureless sintering
Jianguang Xu Huiqiang Li Houan Zhang
Advanced Materials Synthesis and Application Technology Laboratory, Hunan University of Science and Technology, Xiangtan 411201, Hunan, PR China
国际会议
The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))
哈尔滨
英文
70-74
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）