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采用电弧离子镀技水在NiCrAlY涂层与O相Ti_2AlNb合金之间沉积不同Al:Al_2O_3比例的Al-Al_2O_3薄膜作为扩散阻挡层.研究了900℃下恒温氧化500 h后NiCrAlY/Al-Al_2O_3/Ti_2AlNb体系中Al-Al_2O_3层阻挡合金元素互扩散的行为,以及对涂层氧化动力学曲线的影响.结果表明,没有添加扩散阻挡层的NiCrAlY/Ti_2AlNb体系,涂层和基体之间的元素互扩散十分严重,涂层丧失抗氧化能力;而添加扩散阻挡层的材料体系,涂层和基体之间的元素互扩散受到抑制,涂层的长期抗高温氧化性能得到提高.对于3Al-Al_2O_3,1Al-Al_2O_3和0Al-Al_2O_3 3种扩散阻挡层,综合比较材料体系的抗氧化性能、阻挡层阻挡涂层和基体元素互扩散能力、以及涂层和基体之间结合力,当1Al-Al_2O_3薄膜作为扩散阻挡层时,材料性能最优异.同时,本文利用扩散阻挡系数简洁定量地表示出不同Al:Al_2O_3比例阻挡层的阻挡扩散能力.
Al-Al_2O_3 thin films with different Al: Al_2O_3 ratios were deposited as diffusion barriers between NiCrAlY coating and O-phase Ti_2AlNb alloy by arc ion plating technique. The effects of NiCrAlY / Al-Al_2O_3 / Ti_2AlNb Al_2O_3 layer interferes with the inter-diffusion of alloying elements in the system and the effect on the oxidation kinetics of the coating.The results show that the inter-diffusion of elements between NiCrAlY / Ti_2AlNb without diffusion barrier and the matrix Serious, the coating loss of antioxidant capacity; and adding diffusion barrier material system, the inter-elemental diffusion between the coating and the matrix is inhibited, the long-term high temperature oxidation resistance of the coating is improved.For 3Al-Al 2 O 3, 1 Al-Al 2 O 3 And 0Al-Al_2O_3 diffusion barriers, a comprehensive comparison of the oxidation resistance of the material system barrier barrier coating and matrix elements interdiffusion ability, as well as the bonding force between the coating and the matrix, when 1Al-Al_2O_3 film as a diffusion barrier , The material properties are the most excellent.At the same time, the diffusion barrier coefficient of the Al (Al 2 O 3) barrier layer is used to describe the barrier diffusion ability of the Al 1 O 3 layer in a simple and quantitative way.