摘要
为了探究MnCo_(2)O_(4)尖晶石涂层作为固体氧化物燃料电池的金属连接体表面涂层的性能,使用溶胶-凝胶法制备出纯净的前驱体粉末,再使用电泳沉积方法制备出致密的MnCo_(2)O_(4)尖晶石涂层,利用SEM、EDS和XRD等表征手段观察分析MnCo_(2)O_(4)尖晶石涂层的相结构和微观组织形貌。采用“四探针法”测量MnCo_(2)O_(4)尖晶石涂层800℃氧化200 h前后的面比电阻,使用拉拔法对不同界面粗糙度下的涂层的结合强度进行测试,并用有限元仿真加以验证。结果表明,MnCo_(2)O_(4)尖晶石涂层结构均匀,致密度较好。相较于AISI430不锈钢基体来说,在800℃空气中氧化200 h时,抗氧化性提高近3倍。且中温面比电阻小于SOFC金属连接体规定的极限值。此外,基体表面粗糙度可以有效地增加涂层与基体的机械咬合作用,但同时也会导致应力集中,出现缺陷,从而降低了涂层的结合强度。
In order to investigate the performance of MnCo_(2)O_(4)spinel coating as a metal linker surface coating for solid oxide fuel cells,pure precursor powder was prepared by sol-gel method, and then dense MnCo_(2)O_(4)spinel coating was prepared by electrophoretic deposition method. The phase structure and micro-morphology were analyzed by SEM、EDS and XRD. The surface specific resistance of MnCo_(2)O_(4)spinel coatings before and after oxidation at 800 ℃ for 200 h was measured by the four-probe method. The bond strength of the coatings under different interface roughnesses was tested by the pull-out method and verified by finite element simulations. The results show that the MnCo_(2)O_(4)spinel coating has a homogeneous structure and good densities. Compared to the AISI430 stainless steel substrate, the oxidation resistance is nearly three times higher when oxidized at 800 ℃ for 200 h in air. And the surface specific resistance at the medium temperature is less than the limit value specified for SOFC metal connectors. In addition, the surface roughness of the substrate can effectively increase the mechanical bite between the coating and the substrate, but at the same time it can also lead to stress concentration and defects, which reduces the bond strength.
作者
卫书超
李明宇
詹肇麟
Wei Shuchao;Li Mingyu;Zhan Zhaolin(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第12期4697-4704,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(52161014,51665022)。
