电泳沉积制备MnCo尖晶石涂层的高温长期稳定性研究
Long-term Stability of MnCo Spinel Coatings Prepared by Electrophoretic Deposition at High Temperatures
王碧辉 1刘聚 1崔志翔 1肖博 1杨天让 1张乃强1
作者信息
- 1. 华北电力大学能源动力与机械工程学院 北京 102206
- 折叠
摘要
采用电泳沉积工艺在不同Cr含量钢表面制备了Mn1.5Co1.5O4尖晶石涂层,探究了温度对Mn1.5Co1.5O4/钢体系的长期稳定性和导电性能的影响.采用X射线衍射(XRD)、扫描电子显微镜(SEM)和4线法电阻(ASR)测试对样品进行表征.结果表明,两步烧结法得到了相对致密性的涂层.在800℃氧化1000 h后,Mn1.5Co1.5O4/钢的氧化速率约为(1～3)×10-14g2·cm-4·s-1,随着氧化温度的降低,氧化速率常数下降1～2个数量级.SUS430钢凭借自身较低Cr含量,在Mn1.5Co1.5O4/SUS430样品中形成了更薄的含Cr氧化层.同时,氧化过程中钢中Fe向外扩散促进涂层致密性,最终Mn1.5Co1.5O4/SUS430获得了比Mn1.5Co1.5O4/Crofer22H更低的ASR值.
Abstract
Spinel coatings Mn1.5Co1.5O4 on steels SUS430 and Crofer22H were prepared via electro-phoretic deposition,aiming to improve their high-temperature oxidation resistance and electrical conductiv-ity as SOFC interconnector.Afterwards,their oxidation behavior at 700-800℃ and electrical conductivity after oxidation were characterized by means of intermittent weighing method,X-ray diffraction(XRD),scanning electron microscope(SEM)and 4-wire electrical resistance tester(ASR).The result showed that relatively dense coatings may be acquired by two-step sintering.The oxidation rate of Mn1.5Co1.5O4/SUS430 oxidized at 800℃ for 1000 h is about(1-3)× 10-14 g2·cm-4·s-1,and the oxidation rate constant decreases by 1-2 orders of magnitude as the temperature decreases.Mn1.5Co1.5O4/SUS430 formed a thinner Cr-contain-ing oxide scale due to its own low Cr content,at the same time,the Fe diffused outward from the sub-strate steel during the oxidation process to further promote the coating densification.Ultimately,after high temperature oxidation,the Mn1.5Co1.5O4/SUS430 showed ASR values lower than those of the Mn1.5Co1.5O4/Crofer22H.
关键词
固体氧化物燃料电池/铁素体钢/尖晶石涂层/电泳沉积Key words
solid oxide fuel cell/ferrite steel/spinel coating/electrophoretic deposition引用本文复制引用
出版年
2024
NETL
NSTL
万方数据