摘要：固体氧化物燃料电池的连接体使用不锈钢作为原材料成本低廉，但容易导致不锈钢在高位氧化后的Cr扩散，致使燃料电池的阴极发生Cr中毒，而在金属连接体上覆盖一层尖晶石涂层能有效的阻止阴极Cr中毒的发生，并且使连接体更为稳定。常用的尖晶石涂层为Co-Mn尖晶石涂层，因为它具有优良的导电性、与不锈钢相互匹配的热膨胀系数、良好的稳定性和不错的抗氧化性能，同时，它还能有效阻止Cr2O3层的增长。在本实验中，使用SUS430不锈钢作为实验基体，利用混合单一金属粉末的方法配置Mn-Co-Cu金属粉末以及通过溶胶法配置尖晶石粉末并利用等离子喷涂法制涂层，以达到保护金属连接体的作用。在实验中通过等离子喷涂制备涂层，并对涂层进行表征，最终优化基体预氧化时间并且改善喷涂工艺参数。

经实验表明，利用溶胶法配置尖晶石并用于喷涂所需喷涂功率较大，对喷涂设备要求较高，所得涂层与基体之间的结合力较差，涂层内的尖晶石颗粒不发生融合。而利用混合单一金属粉末的方法制备喷涂粉末方法简单，使用Mn-Co-Cu混合金属粉末喷涂所得涂层与不锈钢基体之间的结合力更好，涂层发生明显的融合，但涂层的均一性较差，且涂层易氧化，涂层表面存在大量生粉，需要提高喷涂功率，同时在喷涂后需要更多的处理步骤才能得到所需的尖晶石涂层。

关键词：等离子喷涂；燃料电池；互连件；尖晶石涂层；复合氧化物涂层

Abstract：Solid oxide fuel cell connector using stainless steel as raw material is low cost, but easily lead to stainless steel oxidation in the high after the diffusion of Cr, resulting in the cathode of the fuel cell Cr poisoning, and in the metal connector covered with a layer of spinel coating Can effectively prevent the occurrence of cathode Cr poisoning, and make the connector more stable. The commonly used spinel coating is a Co-Mn spinel coating because it has excellent electrical conductivity, thermal expansion coefficient with stainless steel, good stability and good oxidation resistance, and it is also effective To prevent the growth of Cr2O3 layer. In this experiment, the Mn-Co-Cu metal powder was prepared by mixing SUS430 stainless steel as an experimental substrate by using a single metal powder, and the spinel powder was prepared by sol-gel method and coated by a plasma spraying method to achieve a protective metal linker The role. In the experiment, the coating was prepared by plasma spraying, and the coating was characterized. Finally, the pre-oxidation time of the substrate was optimized and the spraying process parameters were improved.

Experiments show that the use of sol method for the allocation of spinel and spray required for spraying a larger power, the spraying equipment requirements are higher, the resulting coating and the bonding between the matrix is poor, the spinel particles within the coating is not Fusion occurs. The method of preparing the powder by mixing the single metal powder is simple. The method of spraying the powder with Mn-Co-Cu mixed metal powder is better than that of the stainless steel substrate, and the coating is obviously fused, but the coating is uniform The coating is easy to oxidize, the coating surface there is a lot of raw powder, need to improve the spraying power, while spraying after the need for more processing steps to get the required spinel coating.

Key words: plasma spraying; fuel cell; interconnect; spinel coating; composite oxide coating

目录

第一章绪论..1

1.1燃料电池简介..1

1.1.1固体氧化物燃料电池.1

1.2固体氧化物燃料电池金属连接体.2

1.3金属连接体表面防护涂层.4

1.3.1尖晶石涂层4

1.4等离子喷涂技术8

1.4.1等离子喷涂的原理及特点8