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针对TiC涂层在高温烧蚀过程中氧化生成熔融TiO_2,当温度高于2000℃时,熔融TiO_2的厚度随之增加,这将进一步导致涂层结合强度降低,本文采用等离子喷涂方法制备了不同ZrO_2添加量的TiC/ZrO_2复相涂层,以提高涂层的抗冲刷性能。分别利用XRD、SEM和EDS对烧蚀前后材料的相结构、微观形貌和成分进行了分析,探讨了添加高熔点相ZrO_2的复合涂层的抗烧蚀机理。结果表明:TiC/ZrO_2复相涂层展现出更好的抗烧蚀性能,2000℃下的质量烧蚀率仅为1.5×10-4 g·cm~(-2)·s~(-1)。烧蚀过程中产生的ZrO_2层可以阻止内部TiC的进一步氧化,并且可以在一定程度上降低氧乙炔焰对涂层产生的剪切力,以提高涂层的抗冲刷性能。
In view of the oxidation of TiC coating to molten TiO_2 during the high temperature ablation, the thickness of the molten TiO_2 increases when the temperature is higher than 2000 ℃, which will further reduce the bonding strength of the coating. In this paper, different ZrO_2 Adding TiC / ZrO 2 composite coating to improve the anti-erosion performance of the coating. The phase structure, microstructure and composition of the material before and after ablation were analyzed by XRD, SEM and EDS respectively. The anti-ablation mechanism of the composite coating with high melting point phase ZrO 2 was discussed. The results show that the TiC / ZrO 2 composite coating shows better ablation resistance, and the mass ablation rate at 2000 ℃ is only 1.5 × 10-4 g · cm ~ (-2) s ~ (-1) . The ZrO 2 layer produced during the ablation process can prevent further oxidation of the TiC and can reduce the shear force generated by the oxyacetylene flame to the coating to some extent to improve the anti-erosion performance of the coating.