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<p>As a critical microstructural characteristic of thermal barrier coatings (TBCs), porosity serves to reduce their thermal conductivity, thereby enhancing its heat insulating capability. In this work, porous thermal barrier coatings were fabricated via atmospheric plasma spraying (APS) using a composite powder blended of Yb<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> (YbAG) and polymethyl methacrylate (PMMA) in a weight ratio of 90:10. The effects of the PMMA pore-forming agent on the coating’s microstructure, thermal insulation, thermophysical properties and thermal cycling performance were systematically investigated. The findings revealed a 5.23% enhancement in the coating’s porosity with the addition of PMMA. The heat insulation capability was improved by 24.1&#xa0;°C, corresponding to 16.07% decrease in thermal conductivity. Conversely, the thermal cycling lifetime diminishes with PMMA addition, which could be explained by a fraction rise in the amorphous phase as well as by a decline in mechanical properties. The degradation of the coatings is primarily caused by the volume shrinkage caused by sintering transformation and the stress resulting from thermal expansion mismatch.</p>

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Porous Yb3Al5O12 Coatings for High-Temperature Thermal Insulation: Fabrication and Property Evaluation

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Wenbo Tang,
  • Shujuan Dong,
  • Changling Zhou,
  • Longhui Deng,
  • Jianing Jiang,
  • Shuai Li,
  • Zedong Wu,
  • Xueqiang Cao

摘要

As a critical microstructural characteristic of thermal barrier coatings (TBCs), porosity serves to reduce their thermal conductivity, thereby enhancing its heat insulating capability. In this work, porous thermal barrier coatings were fabricated via atmospheric plasma spraying (APS) using a composite powder blended of Yb3Al5O12 (YbAG) and polymethyl methacrylate (PMMA) in a weight ratio of 90:10. The effects of the PMMA pore-forming agent on the coating’s microstructure, thermal insulation, thermophysical properties and thermal cycling performance were systematically investigated. The findings revealed a 5.23% enhancement in the coating’s porosity with the addition of PMMA. The heat insulation capability was improved by 24.1 °C, corresponding to 16.07% decrease in thermal conductivity. Conversely, the thermal cycling lifetime diminishes with PMMA addition, which could be explained by a fraction rise in the amorphous phase as well as by a decline in mechanical properties. The degradation of the coatings is primarily caused by the volume shrinkage caused by sintering transformation and the stress resulting from thermal expansion mismatch.