Effect of CeO 2 on the Microstructure and Properties of Plasma-Sprayed Al 2 O 3 -ZrO 2 Ceramic Coatings
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JMEPEG https://doi.org/10.1007/s11665-020-05147-4
Effect of CeO2 on the Microstructure and Properties of Plasma-Sprayed Al2O3-ZrO2 Ceramic Coatings Yan-wei Wang, Xiao-long Wang, Xing-yu Wang, Yong Yang, Chen Zhang, Wen-wei Sun, Yu-duo Ma, Yu-hang Cui, Lei Wang, and Yan-chun Dong (Submitted May 10, 2020; in revised form August 23, 2020) Al2O3-ZrO2 eutectic ceramic composite coatings with and without CeO2 addition were prepared by atmospheric plasma spraying. The microstructure and properties of the plasma-sprayed Al2O3-ZrO2-CeO2 coating were investigated. The results show that the Al2O3-ZrO2-CeO2 coating contained t-ZrO2, a-Al2O3 and c-Al2O3 phases. Amorphous phase was found in the Al2O3-ZrO2 and Al2O3-ZrO2-CeO2 coatings, which was determined by the characteristics of the plasma spraying process and the eutectic composition of the composite powder. Compared the Al2O3-ZrO2-CeO2 coating with the Al2O3-ZrO2 coating, it was found that the Al2O3-ZrO2 coating with 4 wt.% CeO2 had lower porosity, more uniform and denser microstructure. The addition of 4 wt.% CeO2 was beneficial to improving the hardness, toughness, bond strength and wear resistance of the Al2O3-ZrO2 coating. Keywords
Al2O3-ZrO2 coating, CeO2, eutectic ceramic, plasma spraying
1. Introduction Oxide ceramic materials have good application prospects in engineering fields due to their high strength, high hardness, high chemical stability (corrosion resistance, wear resistance, high temperature resistance and oxidation resistance) (Ref 1, 2). However, the sintered bulk ceramic materials display poor plastic deformation ability and are sensitive to stress concentration and cracking, which limits their applied range. Plasma spraying technology, an important branch of surface engineering technology, is often used to prepare ceramic coating on the surface of metal substrate, which can combine the high toughness of metal materials and the high hardness and high chemical stability of ceramic materials to achieve complementary advantages (Ref 3, 4). Among many oxide ceramic materials, Al2O3 is low in cost and high in strength and hardness and has good friction and wear resistance, low thermal conductivity, good high-temperature insulation performance, stable chemical properties and good corrosion resistance (Ref 5-7). Al2O3 coating prepared by plasma spraying can be used as wear-resistant coating (Ref 810), acid- and alkali corrosion-resistant coating (Ref 11-13), electrically insulating coating (Ref 14, 15) and gas erosion Yan-wei Wang, Xiao-long Wang, Xing-yu Wang, Yong Yang, Chen Zhang, Wen-wei Sun, Yu-duo Ma, Yu-hang Cui, Lei Wang, and Yan-chun Dong, Key Laboratory for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, No. 29 Guangrong Road, Hongqiao District, Tianjin 300132, Peoples Republic of China. Contact e-mails
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