采用电弧离子镀技术(AIP)在HY3(NiCrAlYSi)涂层与镍基高温合金(K5合金)之间沉积一层Al薄膜经过马弗炉870℃加热1h形成Al_2O_3作为扩散障层,研究了Al_2O_3对HY3(NiCrAlYSi)涂层与基体的元素互扩散的阻碍作用和对涂层氧化动力曲线的影响.对于添加扩散障层前后的试样,进行循环抗氧化试验来评价其抗高温氧化性能,并用扫描电镜(SEM)分析氧化前后试样微观形貌和成分,用X-射线衍射仪分析涂层的相结构.试验结果表明:Al_2O_3有效阻止基体与涂层之间的元素互扩散,提高了HY3(NiCrAlYSi)涂层和K5合金的抗高温氧化性能.
Al has been deposited between HY3(NiCrAlYSi)coating and K5 Nickel super-alloy substrate as a diffusion barrier layer by ARC ion plating(AIP)technology. The inhibition effects of diffusion barrier layer on the interdiffusion of the alloy elements and coating system were studied. The influences of the barrier layer on the oxidation kinetics were also investigated. The tests of coating for high-temperature oxidation resistance were conducted. The coatings were characterized by scanning electron microscopy and X-ray diffraction. The results indicated that the Al_2O_3 layer inhibited the inter-diffusion between the coating and the substrate, thus the Al_2O_3 layer could improved the high temperature oxidation resistance of HY3 coatings and K5 super-alloy.
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