摘要固体燃料电池（SOFC）是一种无污染、高效率、全固态结构、具有广泛适应性的新型发电装置。其工作时温度很高，可配合燃气轮机等设备达到资源的最大利用。但其高温工作特点也要求燃料电池的内部结构具有较高耐高温性能。在金属基体表面沉积Co-Mn合金涂层是一种用于固体燃料电池中连接体的抗高温氧化处理方式，可使金属连接体提高耐高温氧化效果。但这项技术还不够成熟，我们还需要对其改进以追求更好的实际使用效果。在合金涂层中加入稀土元素是一种可行的尝试。在本次设计中，我们在稀土元素Dy（镝），这种元素常用作核反应堆控制组件，化学性质活泼。86495

本文采用电火花沉积技术技术，在430不锈钢基体表面制备多组Dy元素含量不同的Co-Mn合金涂层，将几组试样进行800℃高温处理过后分析并研究试样的形貌、高温抗氧化性能，与元素分析。通过使用扫描电镜（SEM）对涂层表面形貌与剖面形貌进行比对分析；通过使用能谱仪（EDS）对合金涂层表面及基体的Cr元素含量进行检测、比对；通过X射线扫描仪（XRD）对氧化后涂层组织结构进行分析。

通过对检测分析结果进行分析、比较可得出结论：添加了Dy元素的合金涂层与基体冶金结合性能良好；在Co-Mn合金涂层加入稀土元素Dy可使合金涂层的抗氧化性能提升，结构强度增加；Dy元素的添加使得基体材料中Cr元素的析出现象有所改善。

毕业论文关键词：电火花沉积,合金涂层，稀土元素Dy，结构分析。

Abstract Solid fuel cell (SOFC) is a non-polluting, high efficiency, all solid structure, with wide adaptability of new power generation equipment。 Its operating temperature is very high, it can be used with gas turbine and other equipment to achieve maximum utilization of resources。 But it also requires high temperature operation characteristic internal structure of the fuel cell has a high temperature resistance。 Deposited on the surface of the metal substrate Co-Mn alloy coating is a solid high-temperature fuel cells linker oxidation treatment for the metal connector can enhance the effect of high temperature oxidation。 But the technology is still not mature enough, we also need to improve their actual pursuit of better results。 Adding rare earth elements in the alloy coating is a viable attempt。 In this design, we have a rare earth element Dy (dysprosium), this element is often used as nuclear reactor control components, chemically active。

In this paper, spark deposition techniques, a plurality of sets of elements in different Dy Co-Mn alloy coating on the substrate surface 430, the groups of samples after 800 ℃ high temperature processing analysis and study of the morphology of the sample, high temperature anti oxidation resistance, and elemental analysis。 By using a scanning electron microscope (SEM) cross section of the coating surface morphology and the morphology of comparative analysis; using energy dispersive spectroscopy (EDS) of the Cr element content of the alloy coating and the substrate surface is detected, match; X-ray scanner (XRD) after oxidation coating structure analysis。

By analyzing the results of the detection analysis and comparison it can be concluded: Added element Dy alloy coating and the substrate metallurgical bonding good performance; in Co-Mn alloy coating adding rare earth elements Dy alloy coatings can enhance the antioxidant properties , increased structural strength; Dy element is added so that the base material of Cr precipitation has improved。

Keywords: deposition, alloy coating, rare earth element Dy, structural analysis。

目录

第一章 绪论 1

1。1 研究背景与意义 1

1。2  稀土元素对合金涂层组织和性能的影响研究现状