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- Title
Microstructure and properties of Al<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-Y<sub>2</sub>O<sub>3</sub> coatings during high temperature and thermal shock resistance.
- Authors
Sun, Wen-Wei; Wang, Xiao-Long; Sun, Xiao-Wen; Yang, Yong; Zhang, Chen; Wang, Yan-Wei; Cui, Yu-Hang; Ma, Yu-Duo
- Abstract
Al2O3-ZrO2 composite coatings were fabricated by plasma spraying Al2O3-ZrO2 composite powders with and without Y2O3 addition to learn the influence of Y2O3 on high temperature stability of the coating. The two coatings both underwent phase transformation in the process of heat treatment. Specifically, XRD results showed that in the Al2O3-ZrO2-Y2O3 coating, Y3Al5O12 (YAG) phase existed after heating at 800 °C, and γ-Al2O3 all transformed to α-Al2O3 after heating at 1200 °C, so the composition of the coating was t-ZrO2, α-Al2O3 and YAG after heating at 1200 °C, while in the Al2O3-ZrO2 coating, the final coating consisted of t-ZrO2 and α-Al2O3 beacuse γ-Al2O3 all transformed to α-Al2O3 after heating at 1200 °C. The amorphous phase in the two as-sprayed coatings had been crystallized completely after heat treatment at 1200 °C. Heat treatment can reduce the porosity and improve the hardness of the two coatings, and YAG phase can also improve the hardness. The coating with TC4 substrate had better thermal shock resistance than it with Q235 steel substrate. The thermal shock resistance of the Al2O3-ZrO2-Y2O3 coating was better than that of the Al2O3-ZrO2 coating at same condition. NiCrAlY bonding layer can improve thermal shock resistance of the coating.
- Subjects
THERMAL shock; THERMAL resistance; HIGH temperatures; YTTRIUM aluminum garnet; PROTECTIVE coatings; COMPOSITE coating
- Publication
Applied Physics A: Materials Science & Processing, 2020, Vol 126, Issue 8, pN.PAG
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-020-03819-5