材料科学
微观结构
溶解
陶瓷
再结晶(地质)
扩散
复合材料
化学工程
热力学
地质学
古生物学
物理
工程类
作者
Shiying Qin,Huatang Cao,Gyn Brewster,Zhaohe Gao,Xiangli Zhong,Bing Han,Ying Chen,Ping Xiao
标识
DOI:10.1016/j.scriptamat.2023.115819
摘要
This work evaluated the resistance of LaPO4 ceramics to CMAS attack at 1250 °C and explored their interaction mechanisms. The chemical reaction between molten CMAS and LaPO4 involves two stages leading to formation of a continuous inner layer and outer polyhedron grains, which effectively prevents the infiltration of CMAS. The reaction layer in this study is formed by inter-diffusion between LaPO4 and CMAS melt in the interface region, which involves a series of events including solution, substitution and recrystallization. The mitigating mechanism differs significantly from the typical 'dissolution-precipitation' process observed in rare-earth zirconate or alumina-based materials during CMAS attack. Because of this novel mechanism, the reaction layer has a crack-free microstructure and seals the surface of the underlying LaPO4 ceramic, which consequently results in enhanced resistance to CMAS attack.
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