期刊
JOURNAL OF THERMAL SPRAY TECHNOLOGY
卷 20, 期 6, 页码 1201-1208出版社
SPRINGER
DOI: 10.1007/s11666-011-9667-4
关键词
amorphous powder; feedstock; lanthanum zirconate; plasma spraying; thermal barrier coating; thermophysical property
资金
- Chinese Academy of Sciences
- NSFC [50972156]
- [1052nm02100]
Free-standing La2Zr2O7 coatings were obtained by plasma spraying, using an amorphous La-O-Zr precursor as the feedstock. The La-O-Zr precursor powder was prepared by coprecipitation. During thermal spraying, the formation of coatings can be regarded as a joint process of melting-solidification, thermal decomposition, and crystallization. The time required for crystal growth was significantly shortened during spraying. Consequently, the average grain size of coatings was approximately 200 nm, with a narrow distribution (100-500 nm). Coatings prepared by this method show better thermophysical properties than those prepared with crystalline La2Zr2O7 powder as the feedstock. The thermal conductivity of the as-sprayed coating was approximately 0.36-0.47 W/m K and the average coefficient of thermal expansion (CTE) is 11.1 x 10(-6)/K.
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