Tunable properties of (HoxY1-x)2SiO5 as damage self-monitoring environmental/thermal barrier coating candidates

被引：20

作者：

Tian, Zhilin ^{[1
,2
]}

Zheng, Liya ^{[1
]}

Hu, Wanpeng ^{[1
,3
]}

Sun, Luchao ^{[1
]}

Zhang, Jie ^{[1
]}

Wang, Jingyang ^{[1
]}

机构：

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, High Performance Ceram Div, Shenyang 110016, Liaoning, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

基金：

国家重点研发计划;

关键词：

THERMAL-CONDUCTIVITY; RE2SIO5; RE; TM; YB; HO; DY; ER;

D O I：

10.1038/s41598-018-36883-2

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

RE2SiO5 with low thermal conductivity, compatible thermal expansion coefficients and excellent high-temperature reliability in harsh environments are excellent candidates as advanced environmental/thermal barrier coating materials for high-efficiency gas turbine engines. A series of rare earth silicates (HoxY1-x)(2)SiO5 are designed and their properties are comprehensively investigated in this paper. Through doping Ho into Y2SiO5, the thermal conductivity of Y2SiO5 is significantly decreased and the thermal expansion coefficient is also optimized closer to Si-based ceramics. High-temperature elastic stiffness and bending strength are increased with the enhancing of Ho content. Most important, doping Ho element provides (HoxY1-x)(2)SiO5 with tunable luminescence characteristic. (Ho(x)Y(1-)x)(2)SiO5 exhibit green, to yellow-green, then to orange-red luminescence color with increased Ho concentration. The results show that they can be used as damage self-monitoring environmental/thermal barrier coating materials for Si-based ceramics.

引用

页数：7