Effect of Thermal Treatment on the Grain Growth of Nanostructured YSZ Thermal Barrier Coating Prepared by Air Plasma Spraying

• Published in: Chinese journal of aeronautics Vol. 17; no. 2; pp. 119 - 123
• Main Author: 王振波 周春根 徐惠彬 宫声凯
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2004
• Subjects: air plasma spraying; nanostructure; thermal barrier coating; YSZ热障涂层; 大气等离子喷涂; 晶粒长大; 热处理; 纳米结构; thermal barrier coating; nanostructure; air plasma spraying
• ISSN: 1000-9361
• DOI: 10.1016/S1000-9361(11)60224-0

A nanostructured thermal barrier coating is prepared by air plasma spraying using the 8wt% Y2O3 partially stabilized zirconia nano-powder with an average grain size of 40 nm. The microstructure and phase composition of feedstock nano-powder and coating are investigated using SEM, TEM and XRD. It is found that the as-sprayed zirconia coating has an average grain size of 67 nm and mainly consistes of metastable tetragonal phase, together with some monoclinic phase and tetragonal phase. Thermal treatment results show that the grains of the nanostructured coating grow slightly below 900°C, whereas over 1000°C the gains grow rapidly and monoclinic phase noticeably appeares.