Thermal properties of single-phase Y₂SiO₅

详细信息    查看全文

• 作者：Ziqi Sun ; Meishuan Li ; Yanchun Zhou
• 关键词：Y₂SiO₅ ; Thermal properties ; Silicate ; Thermal conductivity ; Engine components
• 刊名：Journal of the European Ceramic Society
• 出版年：2009
• 出版时间：March 2009
• 年：2009
• 卷：29
• 期：4
• 页码：551-557
• 全文大小：745 K

文摘

Y₂SiO₅ is a promising candidate for oxidation-resistant or environmental/thermal barrier coatings (ETBC) due to its excellent high-temperature stability, low elastic modulus and low oxygen permeability. In this paper, we investigated the thermal properties of Y₂SiO₅ comprehensively, including thermal expansion, thermal diffusivity, heat capacity and thermal conductivity. It is interesting that Y₂SiO₅ has a very low thermal conductivity (1.40 W/m K) but a relatively high linear thermal expansion coefficient ((8.36 ± 0.5) × 10⁻⁶ K⁻¹), suggesting compatible thermal and mechanical properties to some non-oxide ceramics and nickel superalloys as ETBC layer. Y₂SiO₅ is also an ideal EBC on YSZ TBC layer due to their close thermal expansion coefficients. As a continuous source of Y³⁺, it is predicted that Y₂SiO₅ EBC may prolong the lifetime of zirconia-based TBC by stopping the degradation aroused by the loss of Y stabilizer.