Sc₂O₃ and Gd₂O₃ Co-Doped Strontium Zirconate as a New Thermal Barrier Coating Material

Abstract:

An advanced ceramic material of perovskite structure, Sc₂O₃ (5 mol%) and Gd₂O₃ (5 mol%) co-doped SrZrO₃, was investigated as a material for thermal barrier coating (TBC) applications. Sr(Zr_0.9Sc_0.05Gd_0.05)O_2.95 (SZSG) was synthesized using ball milling prior to solid-state sintering, and had a minor second phase of Gd₂O₃. The material showed good phase stability not only from room temperature to 1400°C, but also at high temperature of 1450°C for a long period, analyzed by DSC and XRD, respectively. The thermal expansion coefficients (TECs) of the sintered bulk SZSG were recorded by a high-temperature dilatometer and revealed a positive influence on phase transitions of SrZrO₃ by co-doping Sc₂O₃ and Gd₂O₃. The thermal conductivity of SZSG had much lower values in contrast to that of SrZrO₃ and Sr(Zr_0.8Gd_0.2)O_2.9 in whole tested temperature range. The good chemical compatibility was observed for SZSG with 8YSZ or Al₂O₃ powders. All the results revealed that SZSG might be a potential material for TBC applications at higher temperatures compared with 8YSZ.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1457-1462
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1457
• Online since: May 2011
• Authors: Wen Ma, Feng Yu Song, Wen Shan Lun, Dong Xing Wang, Hong Ying Dong, Xue Bin Zheng
• Keywords: Perovskite, SrZrO3, Thermal Barrier Coating (TBC), Thermophysical Properties

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DOI: 10.31399/asm.cp.itsc1996p0295