采用扫描电镜和X射线衍射研究了不同SiC体积分数(30%～50%)的SiC/MoSi_2复合材料的高温(1300℃)氧化性能,建立了SiC/MoSi_2复合材料的高温氧化动力学模型,对SiC/MoSi_2复合材料的高温氧化行为进行了动力学分析,研究了其高温氧化机理.结果表明,SiC/MoSi_2复合材料在高温时具有优异的抗氧化性能,SiC/MoSi_2复合材料的高温抗氧化能力好于纯MoSi_2的;复合材料的高温抗氧化性随SiC体积分数的增加而降低.
The high temperature (1300℃) oxidation properties of SiC-(30～50) vol%/MoSi_2 composites are studied by SEM and XRD.The high temperature oxidation dynamics model of SiC/MoSi_2 composites is built.The oxidation behavior of SiC/MoSi_2 composites is analyzed in dynamics.The high temperature oxidation mechanism is studied.The results show that SiC/MoSi_2 composites possesses excellent oxidation resistance at high temperature.The high temperature oxidation resistance property of composites is better than that of pure MoSi_2 and reduces with the increasing of SiC volume fraction.
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