MRS Bulletin

Thermal-barrier coatings for more efficient gas-turbine engines

Thermal-barrier coatings for more efficient gas-turbine engines

Low thermal conductivity oxides

Wei Pana1, Simon R. Phillpota2, Chunlei Wana3, Aleksandr Chernatynskiya4 and Zhixue Qua5

a1 State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing, China; panw@mail.tsinghua.edu.cn

a2 Department of Materials Science and Engineering, University of Florida, Gainesville, FL; sphil@mse.ufl.edu

a3 Graduate School of Engineering, Nagoya University, Nagoya, Japan; chunlei.wan@gmail.com

a4 Department of Materials Science and Engineering, University of Florida, Gainesville, FL; avtche01@gmail.com

a5 College of Materials Science and Engineering, Beijing University of Technology, Beijing, China; quzhixue@bjut.edu.cn

Abstract

Oxides hold great promise as new and improved materials for thermal-barrier coating applications. The rich variety of structures and compositions of the materials in this class, and the ease with which they can be doped, allow the exploration of various mechanisms for lowering thermal conductivity. In this article, we review recent progress in identifying specific oxides with low thermal conductivity from both theoretical and experimental perspectives. We explore the mechanisms of lowering thermal conductivity, such as introducing structural/chemical disorder, increasing material density, increasing the number of atoms in the primitive cell, and exploiting the structural anisotropy. We conclude that further systematic exploration of oxide crystal structures and chemistries are likely to result in even further improved thermal-barrier coatings.

Key Words:

  • Thermal conductivity;
  • ceramics;
  • structural
0Comments