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通过X射线衍射,分析讨论了机械合金化和高温自蔓延方法合成稀土-WSi2/MoSi2复合材料粉末过程中的相变化;比较了MoSi2、WSi2/MoSi2和稀土-WSi2/MoSi2等3种材料的性能.结果表明:高温自蔓延合成方法比机械合金化合成方法更合适于合成稀土-WSi2/MoSi2复合材料粉末;采用SHS合成+球磨的工艺可获得高致密的复合材料.机械合金化合成稀土-WSi2/MoSi2复合材料粉末过程中,Mo、W、Si相遵循Mo(W)固溶体、Si固溶于Mo(W)、WSi2/MoSi2相的形成规律;且随着稀土含量的增加,合金化过程延迟.复合添加稀土和WSi2比单一添WSi2对基体MoSi2具有更好有综合强韧化作用.图4,表1,参16.
The phase transformations of rare earth-WSi2 / MoSi2 composite powders synthesized by mechanical alloying and high temperature self-propagating method were analyzed by X-ray diffraction. The properties of MoSi2, WSi2 / MoSi2 and rare earth-WSi2 / MoSi2 were compared .The results show that high temperature self-propagating synthesis method is more suitable than the mechanical alloying synthesis method for the synthesis of rare earth-WSi2 / MoSi2 composite powder; SHS synthesis + ball milling process can be obtained high density composite material.Metallurgical alloying synthesis of rare earth-WSi2 / MoSi2 composite powders, the Mo, W and Si phases follow the formation of Mo (W) solid solution and Si solid solution in Mo (W) and WSi2 / MoSi2 phases, and the alloying process is delayed with the increase of RE content The composite addition of rare earth and WSi2 is better than the single addition of WSi2 on the matrix MoSi2 has a comprehensive toughening effect.