【摘要】 利用双辉等离子渗金属技术和多弧离子镀技术在TC21钛合金表面制备了Al-Cr复合涂层,并于750,850,950℃下进行了抗高温氧化性能研究。结果表明:Al-Cr涂层分为纯Al层、AlCr合金层、纯Cr层及扩散层,厚度约为48μm,涂层连续致密、无贯穿性裂纹,并且与基体结合紧密。氧化过程中,Al-Cr涂层表面能形成致密的Al2O3氧化层,阻止O元素向内扩散侵蚀基体,使涂层具有优异的抗高温氧化性能;Cr的存在既促进了Al的选择性氧化,同时又使得涂层的自修复能力得到增强。Al-Cr复合涂层显著提高了TC21合金的高温抗氧化性。更多还原

【Abstract】 Al-Cr composite coating of TC21 alloy is prepared by the combined process of multi-arc ion planting and double-glow plasma surface alloying technology.And the high temperature oxidation behavior is studied at 750,850,950 ℃.The results show that the Al-Cr coating,consisted of pure Al layer,AlCr alloy layer,pure Cr layer and diffusion layer,is about 48μm in thick.And it is dense,with no cracks,and combined with substrate firmly.At the process of oxidation,a dense Al2O3 layer is formed on the Al-Cr coating surface,which prevents the internal diffusion of O and the external diffusion of Ti,and makes the composite coating possess an excellent protection performance.Cr promotes the formation of dense Al2O3 and improves the self-repairing function of Al-Cr coating.The Al-Cr composite coating significantly increases the oxidation resistance of TC21 alloy.更多还原