Microstructure and properties of Al2O3-ZrO2-TiO2 composite coatings prepared by plasma spraying

• 作者: Peng-Yue Gao Yu-Duo Ma Wen-Wei Sun Yong Yang Chen Zhang Yu-Hang Cui Yan-Wei Wang Yan-Chun Dong
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1825-1834
• 页数: 10页
• 语种: 英文

摘要

Al2O3-ZrO2-TiO2 coatings were successfully prepared by plasma spraying Al2O3-ZrO2 composite powders with and without TiO2 addition.The effects of TiO2 on the phase composition,microstructure and prop-erties of the Al2O3-ZrO2 coating were studied.The results show that the Al2O3-ZrO2-TiO2 composite powder was composed of t-ZrO2,α-Al2O3,m-ZrO2 and rutile,while the Al2O3-ZrO2-TiO2 composite coating consisted of t-ZrO2,α-Al2O3 and γ-Al2O3.The diffraction peaks of TiO2 could not be detected in the Al2O3-ZrO2-TiO2 coating even up to 10 wt％ TiO2 addition.The reason may be that TiO2 was dissolved in the amorphous phase or formed solid solution with γ-Al2O3 phase in the coating during cooling.Com-pared with the Al2O3-ZrO2 coating,the as-prepared Al2O3-ZrO2-TiO2 coating had denser microstructure,less microcracks and more amorphous phases.The density of the Al2O3-ZrO2-TiO2 coating increased with the increase of TiO2 content.The Al2O3-ZrO2-10wt％TiO2 coating had the most uniform and dense microstructure,possessed higher toughness,adhesive strength and wear resistance compared with the Al2O3-ZrO2 coating,which was due to its lower porosity and more uniform microstructure.