Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 12    December 2010

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Influence of heat treatment on nanocrystalline zirconia powder and plasma-sprayed thermal barrier coatings
JIANG Xian-liang(蒋显亮)1, LIU Chun-bo(刘纯波)1, LIU Min(刘 敏)2, ZHU Hui-zhao(朱晖朝)2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510651, China

Abstract:Nanostructured zirconia top coat was deposited by air plasma spray and NiCoCrAlTaY bond coat was deposited on Ni substrate by low pressure plasma spray. Nanostructured and conventional thermal barrier coatings were heat-treated at temperature varying from 1050 to 1 250 oC for 2−20 h. The results show that obvious grain growth was found in both nanostructured and conventional thermal barrier coatings (TBCs) after high temperature heat treatment. Monoclinic/tetragonal phases were transformed into cubic phase in the agglomerated nano-powder after calcination. The cubic phase content increased with increasing calcination temperature. Calcination of the powder made the yttria distributed on the surface of the nanocrystalline particles dissolve in zirconia when grains grew. Different from the phase constituent of the as-sprayed conventional TBC which consisted of diffusionless- transformed tetragonal, the as-sprayed nanostructured TBC consisted of cubic phase.


Key words: nanocrystalline material; zirconia; thermal barrier coating; heat treatment; phase composition

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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