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摘要-NiAl涂层是一种非常有前景的抗高温氧化防护材料，然而由于涂层表面氧化膜粘附性差以及界面互扩散现象严重等问题未解决，尚未获得广泛应用。为研究改性-NiAl涂层的抗高温氧化性能，采用EB-PVD的方法在Ni3Al基单晶合金上制备NiAl-0.05Hf-0.05Zr、Pt改性NiAl-0.05Hf-0.05Zr及NiAl-0.05Hf-0.05Zr-1Cr-3Si涂层，并分析Hf/Zr二元活性元素掺杂对NiAl涂层高温氧化性能的影响，进一步分析了电镀Pt、Cr/Si掺杂对NiAlHfZr涂层高温氧化性能和互扩散行为的影响。结果表明，Hf/Zr掺杂有利于提高涂层氧化膜的附着性，增强涂层的抗高温氧化能力；电镀Pt和掺杂Cr/Si均可有效提高涂层氧化膜的抗剥落能力；Pt和Si均可以抑制Mo元素由基体向涂层的外扩散。26441
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关键词 -NiAl涂层 高温氧化 EB-PVD Hf/Zr掺杂 电镀Pt Cr/Si掺杂
毕业论文设计说明书外文摘要
Title Study on the High-Temperature Oxidation Mechanism of Two Reactive Elements Doped β-NiAl Coatings
Abstract
-NiAl coating is a very promising protective coating material which has good high-temperature oxidation resistance. However, -NiAl isn’t widely applied, because serious problems haven’t been solved which include poor adhesion of the oxide scale during cyclic oxidation and interfacial diffusion between the alloy matrix and the coating. NiAl-0.05Hf-0.05Zr, Pt modified NiAl-0.05Hf-0.05Zr and NiAl-0.05Hf-0.05Zr-1Cr-3Si coatings were prepared on Ni3Al based single crystal superalloy by electron beam physical vapor deposition (EB-PVD) in order to understand the high-temperature oxidation resistance of modified -NiAl coatings. High-temperature oxidation resistance of Hf/Zr co-doped β-NiAl coatings was studied. Forthermore, effects on high-temperature oxidation resistance and interdiffusion of electro-plating Pt and co-doping Cr/Si in β-NiAlHfZr coatings were investigated.Conclusions revealed that high-temperature oxidation resistance and oxide scale adhesion of Hf/Zr co-doped β-NiAl coatings were improved; the oxide scale spallation resistance was improved by electro-plating Pt and co-doping Cr/Si in β-NiAlHfZr coatings; outward diffusion of Mo from the alloy to matrix could be prevented by Pt and Si.
Keywords -NiAl coating high-temperature oxidation EB-PVD co-doping Hf/Zr electro-plating Pt co-doping Cr/Si
目 次
1 引言 1
1.1 热障涂层材料 2
1.1.1 陶瓷层材料 2
1.1.2 粘结层材料 3
1.1.3 热生长氧化物层 3
1.2 粘结层材料的研究现状 4
1.2.1 Pt改性β-NiAl涂层 4
1.2.2 活性元素改性β-NiAl涂层 4
1.2.3 Cr、Si改性β-NiAl涂层 6
1.3 热障涂层的制备技术 6
1.3.1 等离子喷涂 6
1.3.2 电子束物理气相沉积 7
1.4 本文的研究目的、意义及主要研究内容 8
1.4.1 研究目的和意义 8
1.4.2 主要研究内容 8
2 实验方法、原料和步骤 9
2.1 实验方法 9
2.2 实验原料 10
2.2.1 基体材料 10
2.2.2 靶材材料 10
2.3 实验步骤 10
2.3.1 制备基体 10
2.3.2 电镀Pt 10
2.3.3 制备靶材 11
2.3.4 EB-PVD沉积涂层 12
2.3.5 真空热处理 12
2.3.6 循环氧化 13
2.3.6 观察微观形貌、结构和成分分析 14