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本文论述了高温下涂层材料的氧化防护机理。其界面的高温过程是氧化气氛通过熔融涂层向基体扩散,导致基体合金氧化。另一过程是合金元素和涂层某些组分如硅,在界面处向内扩散。研究结果揭示了涂层一合金体系的氧化作用。涂层的作用在于阻滞氧化气氛的扩散,从而减缓铬的贫化,但不减缓钛、铝的贫化。此外,涂层中的硅,在高温过程中也有少量渗入,其深度在1100℃1000小时后为0.2mm。界面处除生成氧化物外,未发现其它反应生成物。
This article discusses the oxidation protection mechanism of coating materials at high temperatures. The interface of the high temperature process is the oxidation of the atmosphere through the molten coating diffusion to the matrix, resulting in oxidation of the matrix alloy. Another process is that alloying elements and some components of the coating, such as silicon, diffuse inwardly at the interface. The results revealed the oxidation of the coating-alloy system. The role of the coating is to retard the diffusion of the oxidizing atmosphere, thereby reducing the depletion of chromium, but not slowing down the depletion of titanium and aluminum. In addition, the silicon in the coating is also slightly infiltrated during high temperatures, with a depth of 0.2 mm after 1000 hours at 1100 ° C. In addition to the interface at the formation of oxides, no other reaction products were found.