Microstructure and properties of TiCN-Mo coatings prepared by reactive plasma spraying
NI Pan1, NIU Jinghui1, LIU Hongbing1, ZHANG Haifeng1, MENG Hailong2, JIANG Dehua1, GONG Yue3, SHAO Lin4
1. Tianjin petroleum vocational and technical college, Tianjin 301607, China; 2. The third oil production plant of Petro China Changqing Oilfield, Wushenqi 017300, China; 3. Exploration and development research institute of Sinopec, Yangzhou 225007, China; 4. East China petroleum technician college, Yangzhou 225129, China
Abstract：Three types of TiCN-Mo coatings with different Mo contents were deposited on steel substrate surface by reactive plasma spraying. The phase composition and microstructures of as-sprayed coatings were investigated by XRD, SEM and EDS. A Vickers microhardness test was used to measure the microhardness and indentation fractures of the coatings. In addition, a statistics method of Weibull distribution was used to examine the microhardness scattering. The results show that all coatings consist of TiC0.7N0.3, TiN, Mo, minor Ti2O and molybdenum oxides. Metal Mo in white color is evenly distributed around TiCN to form a dense microstructure, which presents an alternately stacked characteristic. The Weibull distribution of the microhardness of three coatings is dominated by apparent scattering. Compared to the monolithic TiCN coatings, the as-sprayed coating with 10% Mo displays a relatively low scattering characteristic of Vickers microhardness and a dense microstructure as well as high indention toughness and strength.
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2018, Vol. 23 
