Effects of Y₂O₃ on SiC/MoSi₂ composite by mechanical-assistant combustion synthesis

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• 作者：Fang Chen ; Jianguang Xu ; ^jgxu@163.com ; Jianhui Yan ; Siwen Tang
• 关键词：Y2O3 ; SiC/MoSi2 composite ; Mechanical-assistant combustion synthesis ; Mechanical property ; Oxidation resistance
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：36
• 期：Complete
• 页码：143-148
• 全文大小：1262 K

文摘

MoSi₂ based materials are considered as a potential high temperature structural parts. In this work, a 0.5 wt % Y₂O₃-20 vol % SiC/MoSi₂ composite was successfully prepared by pressureless sintering from mechanical-assistant combustion synthesized powders. Adding a small amount of Y₂O₃ to the SiC/MoSi₂ composite decreased the apparent activation energy of sintering by 10.4 % , resulting in a denser composite with finer grains. The relative density, flexural strength, Vickers hardness and fracture toughness of 0.5 wt % Y₂O₃-20 vol % SiC/MoSi₂ increased by 5.3 % , 27.7 % , 27.2 % and 35.8 % as compared to 20 vol % SiC/MoSi₂, respectively. The oxidation mass gain of Y₂O₃-20 vol % SiC/MoSi₂ at 1200 ¡ãC was higher than that of 20 vol % SiC/MoSi₂ for 16.9 % , while it still exhibited very good oxidation resistance at this temperature.