Thermal properties of single-phase Y2SiO5

Authors

Ziqi Sun, Chinese Academy of SciencesFollow
Meishuan Li, Chinese Academy of Sciences
Yanchun Zhou, Chinese Academy of Sciences

RIS ID

41911

Publication Details

Sun, Z., Li, M. & Zhou, Y. (2009). Thermal properties of single-phase Y2SiO5. Journal of the European Ceramic Society, 29 (4), 551-557.

Abstract

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.