Journal
SOLID STATE SCIENCES
Volume 38, Issue -, Pages 119-123Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2014.10.010
Keywords
Sealing material; Coefficient of thermal expansion; High temperature X-ray diffraction; Barium alumosilicates; Calcium alumosilicates
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Sealing of components for high temperature applications with coefficients of linear thermal expansion (CTE) > 10.10(-6) K-1 can be achieved by glasses from which crystalline phases with high CTE are precipitated. Many sealing glasses also contain further components as e. g. aluminium and hence, not only the desired phase is crystallized, but also additional phases. For this purpose, high temperature XRD was performed in order to determine the CTE of BaAl2Si2O8, CaAl2Si2O8, and Ca2Al2SiO7. In the case of BaAl2Si2O8 and Ca2AlSi2O7 the CTEs were 7.8.10(-6)/K and 7.9.10(-6)/K, respectively. In the case of CaAl2-Si2O8 the CTE is 4.4.10(-6)/K. Especially the formation of the latter phase should be avoided for a sealing material of high temperature fuel cells. Sintered specimens of the respective compounds were also characterized by dilatometry. (C) 2014 Elsevier Masson SAS. All rights reserved.
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