期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 32, 期 16, 页码 4009-4013出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.07.036
关键词
Thermal properties; Glass-ceramics; Fuel cells
资金
- Department of Energy/SECA [NT42221]
- National Natural Science Foundation of China [51102045]
- Ph.D. Programs Foundation of Ministry of Education of China [20103514120006]
- Fujian Education Department [JA11007]
- Fujian Education Department of China [JA09020]
In this paper, a series of Sr-Ba-borosilicate glass-ceramics (10-40 mole% B2O3) were prepared to investigate the effect of borate content on the thermal properties as well as volatilization behavior. For crystallized samples with increasing borate contents, the dilatometric softening points decrease, from 702 to 660 degrees C, as do the coefficients of thermal expansion, from 9.5 to 7.5 x 10(-6) K-1. In addition, the weight loss from these materials, in wet forming gas at 780 degrees C for 28 days, decreases by a factor of two as the borate content increases from 10 to 40 mole%. The borate-containing phase, SrB2O4, forms with increasing borate content. The significant improvement in stability against volatility can be attributed to the formation of SrB2O4, which is consistent with the results of thermochemical calculations. These results therefore indicate one way to design sealing compositions to use B2O3 to tailor thermal properties without sacrificing thermal stability. (C) 2012 Elsevier Ltd. All rights reserved.
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