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摘要：通过脉冲电沉积法在镍基高温合金上制备了Ni-Mo-Al-RE-MoSi2复合镀层，在Ni-Mo-Al-MoSi2复合镀层的较佳工艺下，研究不同稀土离子浓度对Ni-Mo-Al-RE-MoSi2复合镀层含量的的影响，筛选出较佳稀土离子及浓度参数。并分别采用扫描电镜(SEM)、电子能谱仪(EDX)，分析了复合镀层的微观形貌、成分、结构。35111
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扫描电镜结果表明Ni-Mo-Al-MoSi2和Ni-Mo-Al-RE-MoSi2复合镀层表面分布着嵌入镀层的颗粒。Ni-Mo-Al-RE（La、Nd、Y、Dy）-MoSi2复合镀层表面颗粒更细；Ni-Mo-Al-RE（Ce、Pr、Sm）-MoSi2复合镀层表面小突起团状颗粒减小。
能谱结果表明镀层中含有Ni，Mo，Al，Si和RE（Ce、Dy、La、Nd、Pr、Y、Sm），说明制备的镀层为Ni-Mo-Al-MoSi2和Ni-Mo-Al-RE-MoSi2复合镀层。Ni-Mo-Al-MoSi2复合镀层中Mo元素含量为25.22%，Al元素含量为2.35%，Si元素含量为2.23%；Ni-Mo-Al-RE（Ce、Dy、La、Nd、Pr、Y、Sm）-MoSi2复合镀层中Mo元素含量分别为61.66%、32.72%、43.63%、33.82%、33.39%、21.64%、40.65%，Al元素含量分别为2.80%、1.71%、5.19%、2.56%、5.63%、9.22%、1.21%，Si元素含量分别为1.79%、1.36%、1.57%、2.70%、2.33%、1.05%、3.11%。
毕业论文关键字：复合镀；MoSi2；稀土离子
Abstract：In this paper ，Ni-Mo-Al-MoSi2 and Ni-Mo-Al-RE-MoSi2 composite coatings were prepared as the bond coating by pulse plating method.The effects of different RE ion on the property of composite coatings were studied，and the optimal operating conditions were found . The morphology surface ，compositions and structure， thermal expansion coefficient and wear resistance of composite plating were analyzed by scanning electron microscopy (SEM). Energy Disperse X-ray detectors (EDX)， X-ray diffraction (XRD) and thermal expansion instrument(DIL) and Friction and wear Tester.
SEM shows that the surface of the Ni-Mo-Al-MoSi2 and Ni-Mo-Al-RE-MoSi2 composite coatings filled witn many particles which are made up of Ni，Mo，MoSi2. The particles on the surface of the Ni-Mo-Al-RE（La、Nd、Y、Dy）-MoSi2 composite coatings are finer; the number of small protuberance group shape particles on the surface of the Ni-Mo-Al-RE（Ce、Pr、Sm）-MoSi2 composite coatings also decrease.
EDX shows coatings are composed of Ni，Mo，Al，Si and RE（Ce、Dy、La、Nd、Pr、Y、Sm），which illustrates that the coatings are Ni-Mo-Al-MoSi2 and Ni-Mo-Al-RE-MoSi2 composite coatings. the Mo content in the Ni-Mo-Al-MoSi2 and Ni-Mo-Al-RE（Ce、Dy、La、Nd、Pr、Y、Sm）-MoSi2 composite coatings is 25.22%、61.66%、32.72%、43.63%、33.82%、33.39%、21.64%、40.65% respectively;the Al content in the Ni-Mo-Al-MoSi2 and Ni-Mo-Al-RE（Ce、Dy、La、Nd、Pr、Y、Sm）-MoSi2 composite coatings is 2.35%、2.80%、1.71%、5.19%、2.56%、5.63%、9.22%、1.21%，the Si content in the Ni-Mo-Al-MoSi2 and Ni-Mo-Al-RE（Ce、Dy、La、Nd、Pr、Y、Sm）-MoSi2 composite coatings is 2.23%、1.79%、1.36%、1.57%、2.70%、2.33%、1.05%、3.11%.
Keywords: Composite coating；MoSi2；Rare earth
目 录
1 引言 1
1.1 热障涂层研究现状 1
1.2 脉冲复合镀的基本原理 3
1.2.1 脉冲复合镀 3
1.2.2 复合电镀机理及模型 4
1.2.3 影响复合镀层性能的因素 4
1.3 MoSi2的性能及在复合镀中应用 5
1.4 稀土在脉冲复合镀中的应用 6
1.4.1 稀土的介绍 6
1.4.2 稀土在电镀中的应用 6
1.5 Al元素的性能及应用 8
1.6 本课题来源、研究内容及意义 9
1.6.1 课题来源 9
1.6.2 研究内容 9
1.6.3 研究背景及意义 9
2 实验部分 10