Wear Resistance of YSZ Fibers Reinforced Al2O3/8YSZ Coatings Prepared by Atmosphere Plasma Spraying
WANG Chang1, PANG Xuejia2, GAO Zonghong1, LIU Jinna1, FANG Yongchao1, CUI Xiufang1, LIU Erbao1, JIN Guo1
1 College of Material Science and Chemical Engineering,Harbin Engineering University, Harbin 150001; 2 The 703 Research Institute of CSIC, Harbin 150078
Abstract: The purpose of this work is to apply fiber toughening concept in the design of plasma spraying coatings to improve the fracture toughness, so as to solve the problem of the poor toughness of plasma spraying ceramic coatings. 4wt% and 8wt% yttria stabilized zirconia (YSZ) fibers reinforced Al2O3/8YSZ coatings were prepared by atmosphere plasma spraying method. The effect of fiber reinforced coatings on fracture toughness and wear resistance was studied. The results indicated that the phases of coatings were α-Al2O3, γ-Al2O3 and t'. Fracture toughness of Al2O3/8YSZ coatings added with YSZ fibers were significantly improved, and the KIC of coatings added with 8wt% YSZ fibers was 2.924 MPa·m1/2. The addition of YSZ fibers has little influence on the micro-hardness of coatings. In the same wear condition, the wear loss of coatings added with YSZ fibers was greatly reduced, compared with the coatings without fibers. The wear resistance of coatings added with 8wt% YSZ fibers was 2.5 times of the coatings without fibers.
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2018, Vol. 32 
