| Thermal properties and thermal shock resistance of gamma-Y2Si2O7 | |
| Z. Q. Sun; Y. C. Zhou; J. Y. Wang; M. S. Li | |
| 2008 | |
| Source Publication | Journal of the American Ceramic Society
 |
| ISSN | 0002-7820 |
| Volume | 91Issue:8Pages:2623-2629 |
| Abstract | 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. |
| description.department | [sun, ziqi; zhou, yanchun; wang, jingyang; li, meishuan] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [sun, ziqi] chinese acad sci, grad sch, beijing 100039, peoples r china.;zhou, yc (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;yczhou@imr.ac.cn |
| Keyword | Silicon-nitride Heat-capacity Mechanical-properties Stress Resistance Barrier Coatings Flash Method Ceramics Conductivity Diffusivity Temperature |
| URL | 查看原文 |
| WOS ID | WOS:000258379300029 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/33095 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation 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. |
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