Graceful behavior during CMAS corrosion of a high-entropy rare-earth zirconate for thermal barrier coating material |
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Affiliation: | 1. Henan Province Key Laboratory of Utilization of Non-metallic Mineral in the south of Henan, Xinyang Normal University, Xinyang 464000, China;2. Institute of Development and Application of Shangtianti Nonmetallic Mining Technology, Xinyang 464117, China |
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Abstract: | The corrosion resistance to calcium-magnesium-alumino-silicates (CMAS) is critically important for the thermal barrier coatings (TBCs). High-entropy zirconate (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 (HEZ) ceramics with low thermal conductivity, high coefficient of thermal expansion and good durability to thermal shock is expected to be a good candidate for the next-generation TBCs. In this work, the CMAS corrosion of HEZ at 1300°C was firstly investigated and compared with the well-studied La2Zr2O7 (LZ). It is found that the HEZ ceramics showed a graceful behavior to CMAS corrosion, obviously much better than the LZ ceramics. The HEZ suffered from CMAS corrosion only through dissolution and re-precipitation, while additional grain boundary corrosion existed in the LZ system. The precipitated high-entropy apatite showed fine-grained structure, resulting in a reaction layer without cracks. This study reveals that HEZ is a promising candidate for TBCs with extreme resistance to CMAS corrosion. |
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Keywords: | Thermal barrier coatings CMAS corrosion High-entropy ceramics Rare-earth zirconate |
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