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采用化学气相浸渗/反应法(CVI/CVR)在C/C复合材料表面制备MoSi2-SiC防氧化涂层。首先,制备多孔金属Mo层,然后以甲基三氯硅烷(MTS)为前驱体,利用CVI/CVR技术制备MoSi2-SiC复合涂层。采用XRD、SEM技术研究MoSi2-SiC复合涂层的制备机理,并考察涂层样品的抗氧化性能。结果表明,MTS分解的SiC填充了多孔金属Mo层中的孔隙,并与金属Mo发生反应,制备出致密的MoSi2-SiC复合涂层;在优化工艺条件下所得到的涂层样品在1500°C空气中氧化80h后质量损失仅为1.25%。
MoSi2-SiC anti-oxidant coatings were prepared on C / C composites by chemical vapor infiltration / reaction (CVI / CVR). First, a porous metal Mo layer is prepared, and then a MoSi2-SiC composite coating is prepared by using CVI / CVR technology with methyltrichlorosilane (MTS) as a precursor. The preparation mechanism of MoSi2-SiC composite coating was studied by XRD and SEM, and the oxidation resistance of the coating samples was investigated. The results show that the MTS-decomposed SiC fills the pores in the porous metal Mo layer and reacts with the metal Mo to produce a compact MoSi2-SiC composite coating; the coating sample obtained under the optimized process conditions is sintered at 1500 ° C. The mass loss in air after oxidation for 80h is only 1.25%.