articleJournal of Advanced CeramicsJul 25, 2019GOLD OA

High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials

FLFei LiLZLin ZhouJLJi‐Xuan LiuYLYongcheng LiangGZGuo‐Jun Zhang

Donghua University

Indexed incrossrefdoaj

Abstract

High-entropy pyrochlore-type structures based on rare-earth zirconates are successfully produced by conventional solid-state reaction method. Six rare-earth oxides (La2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, and Y2O3) and ZrO2 are used as the raw powders. Five out of the six rare-earth oxides with equimolar ratio and ZrO2 are mixed and sintered at different temperatures for investigating the reaction process. The results demonstrate that the high-entropy pyrochlores (5RE1/5)2Zr2O7 have been formed after heated at 1000°C. The (5RE1/5)2Zr2O7 are highly sintering resistant and possess excellent thermal stability. The thermal conductivities of the (5RE1/5)2Zr2O7 high-entropy ceramics are below 1 W·m–1·K–1 in the…

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Topics & keywords

Topics
Keywords
  • Materials science
  • Thermal barrier coating
  • Sintering
  • Pyrochlore
  • Thermal conductivity
  • Ceramic
  • Coating
  • Structural material
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