Influence of Element Evaporation on the Composition of La2Ce2O7 Splats Deposited by Plasma Spraying

Wednesday, May 13, 2015
Exhibit Halls A&B (Long Beach Convention and Entertainment Center)
Mrs. Li-Shuang Wang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Dr. Tao Liu , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Guan-Jun Yang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Chang-Jiu Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Cheng-Xin Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
La2Ce2O7 (LCO) is one of the promising candidates of thermal barrier coating materials. However, during plasma spraying, the evaporation of both CeO2 and La2O3 leads to deviation of coating composition from starting powder particle. In this study, an agglomerated La2Ce2O7 powder with Ce/La ratio of 1.5 and in a size range of 10-44 μm was used to deposit the splats and coatings under different plasma spray conditions. The compositions of La2Ce2O7 splats in different sizes were characterized by SEM and EDS, and splat dimensions were characterized by 3D laser microscopy. The relationship between droplet size and splat composition was examine. Results showed that Ce/La ratio in splats changes from 1.5 to 0.7 with splats diameter. The mechanism of this change is examined based on evaporation of difference of elemental evaporation during plasma heating of LCO particles in APS for the control of LCO coating composition.
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