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研究了双层辉光等离子渗Cr对TC4合金650、750、850℃恒温氧化性能的影响。结果表明:渗Cr后,表面梯度合金层显著提高了TC4合金的高温氧化性能,Ti-Cr互扩散层可有效阻止氧向基体扩散。氧化过程中,Ti、Cr向外扩散形成TiO2/Cr2O3氧化膜,其形态与氧化温度有关。850℃氧化100 h后,渗Cr试样表面形成致密Cr2O3膜,恒温氧化性能优于NiCrAlY热障涂层。
The effects of Cr (superscript 2 +) plasma infiltration on the isothermal oxidation properties of TC4 alloy at 650, 750 and 850 ℃ were studied. The results show that the surface graded alloy layer can significantly improve the high temperature oxidation performance of the TC4 alloy after infiltrating Cr, and the Ti-Cr interdiffusion layer can effectively prevent the diffusion of oxygen to the matrix. In the oxidation process, Ti and Cr diffuse outwards to form TiO2 / Cr2O3 oxide film, the morphology of which is related to the oxidation temperature. After oxidation at 850 ℃ for 100 h, the compact Cr2O3 film was formed on the surface of Cr-infiltrated samples, and the oxidation behavior at constant temperature was better than that of NiCrAlY thermal barrier coatings.