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Microstructure and properties evolution of plasma sprayed Al2O3-ZrO2-TiO2 coatings during high temperature and thermal shock resistance
Materials at High Temperatures ( IF 1.3 ) Pub Date : 2020-06-01 , DOI: 10.1080/09603409.2020.1773203
Yu-duo Ma 1 , Xing-yu Wang 1 , Xiao-wen Sun 1 , Yong Yang 1 , Chen Zhang 1 , Peng-yue Gao 1 , Yu-hang Cui 1 , Lei Wang 1 , Yan-chun Dong 1 , You Wang 2
Affiliation  

ABSTRACT Al2O3-ZrO2 and Al2O3-ZrO2-TiO2 composite coatings were prepared by plasma spraying. The effects of TiO2 on the microstructure evolution and thermal shock resistance of the Al2O3-ZrO2 coating at high temperature were investigated. The results show that there was no phase transformation present in the two coatings after heat treatment at 800°C, and they were composed of t-ZrO2, α-Al2O3 and γ-Al2O3 phases. The Al2O3-ZrO2 coating after heat treatment at 1200°C consisted of t-ZrO2 and α-Al2O3, and the Al2O3-ZrO2-TiO2 coating consisted of t-ZrO2, α-Al2O3 and rutile-TiO2. The high temperature heat treatment reduced the porosity of the two coatings, and the hardness of the two coatings increased first and then decreased. The thermal shock resistance of the two coatings could be improved effectively by spraying the bonding layer and selecting TC4 titanium alloy as the substrate. And the Al2O3-ZrO2-TiO2 coating had a longer thermal cycle life than the Al2O3-ZrO2 coating.

中文翻译:

等离子喷涂Al2O3-ZrO2-TiO2涂层的高温抗热震性能变化

摘要 采用等离子喷涂制备了Al2O3-ZrO2和Al2O3-ZrO2-TiO2复合涂层。研究了TiO2 对Al2O3-ZrO2 涂层在高温下的微观结构演变和抗热震性的影响。结果表明,两种涂层在800℃热处理后均未发生相变,由t-ZrO2、α-Al2O3和γ-Al2O3相组成。1200℃热处理后的Al2O3-ZrO2涂层由t-ZrO2和α-Al2O3组成,Al2O3-ZrO2-TiO2涂层由t-ZrO2、α-Al2O3和金红石-TiO2组成。高温热处理降低了两种涂层的孔隙率,两种涂层的硬度先增加后降低。通过喷涂结合层并选择TC4钛合金作为基材,可以有效提高两种涂层的抗热震性。并且Al2O3-ZrO2-TiO2涂层比Al2O3-ZrO2涂层具有更长的热循环寿命。
更新日期:2020-06-01
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