Thermal properties and thermal shock resistance of gamma-Y2Si2O7

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	Thermal properties and thermal shock resistance of gamma-Y2Si2O7
	Z. Q. Sun ; Y. C. Zhou ; J. Y. Wang ; M. S. Li
刊名	Journal of the American Ceramic Society
	2008
卷号	91 期号:8 页码:2623-2629
关键词	silicon-nitride heat-capacity mechanical-properties stress resistance barrier coatings flash method ceramics conductivity diffusivity temperature
ISSN号	0002-7820
中文摘要	Thermal properties, namely, Debye temperature, thermal expansion coefficient, heat capacity, and thermal conductivity of gamma-Y2Si2O7, a high-temperature polymorph of yttrium disilicate, were investigated. The anisotropic thermal expansions of gamma-Y2Si2O7 powders were examined using high-temperature X-ray diffractometer from 300 to 1373 K and the volumetric thermal expansion coefficient is (6.68 +/- 0.35) x 10(-6) K-1. The linear thermal expansion coefficient of polycrystalline gamma-Y2Si2O7 determined by push-rod dilatometer is (3.90 +/- 0.4) x 10(-6) K-1, being very close to that of silicon nitride and silicon carbide. Besides, gamma-Y2Si2O7 displays a low-thermal conductivity, with a kappa value measured below 3.0 W.(m.K)(-1) at the temperatures above 600 K. The calculated minimum thermal conductivity, kappa(min), was 1.35 W.(m.K)(-1). The unique combination of low thermal expansion coefficient and low-thermal conductivity of gamma-Y2Si2O7 renders it a very competitive candidate material for high temperature structural components and environmental/thermal-barrier coatings. The thermal shock resistance of gamma-Y2Si2O7 was estimated by quenching dense materials in water from various temperatures and the critical temperature difference, Delta T-c, was determined to be 300 K.
原文出处	://WOS:000258379300029
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/33095]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Q. Sun,Y. C. Zhou,J. Y. Wang,et al. Thermal properties and thermal shock resistance of gamma-Y2Si2O7[J]. Journal of the American Ceramic Society,2008,91(8):2623-2629.
APA	Z. Q. Sun,Y. C. Zhou,J. Y. Wang,&M. S. Li.(2008).Thermal properties and thermal shock resistance of gamma-Y2Si2O7.Journal of the American Ceramic Society,91(8),2623-2629.
MLA	Z. Q. Sun,et al."Thermal properties and thermal shock resistance of gamma-Y2Si2O7".Journal of the American Ceramic Society 91.8(2008):2623-2629.