Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7887736 | Ceramics International | 2018 | 26 Pages |
Abstract
A novel compressive boron nitride (h-BN) based seal has been developed for planar intermediate temperature solid oxide fuel cell (SOFC). It exhibited extremely low leakage rates and thermal cycling stability under simulated stack conditions. The h-BN based seal showed leakage rates of 0.01 sccm/cm under gas pressure of 6.8 kPa in the temperature range of 650-800 °C, and maintained similar leakage rates during 10 thermal cycles. The excellent sealing performance can be explained by oxidation of h-BN surface to form liquid B2O3 layers beyond the critical temperature of 700 °C. Two of compliant B2O3 glass layers were observed on the surface of the h-BN to adjoin well cell and metallic interconnect. The sandwich structure with liquid B2O3 layer on two sides of the h-BN seal could not only enhance interfacial adherence but also eliminate the gas leakage paths at SOFC operation temperature. The applicability of the h-BN based seal has also been verified by single cell test.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xiaochun Wang, Wei Zhang, Ruizhu Li, JiaJun Yang, Dong Yan, Jian Pu, Bo Chi, Jian Li,