Open AccessMorphology and Wear Resistance of HVOF Sprayed H13-WC/Ni Gradient Coating on H13 Steel Surface
Author(s) -
Hongbo Li,
Li Ban,
Chengxu Deng,
Yijing Wang
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1213/5/052020
Subject(s) - materials science , coating , thermal spraying , thermal shock , indentation hardness , microstructure , layer (electronics) , composite material , die (integrated circuit) , metallurgy , nanotechnology
A H13-WC/Ni gradient coating was prepared by high velocity oxygen-fuel (HVOF) thermal spraying on the surface of H13 steel. The coating consists of multi-layer H13 and Ni/WC powders in different proportions with the reinforced particles of Ni/WC ratio increased by 15% (mass fraction) layer by layer. By observing the microstructures of sprayed powders and coatings and testing the thermal shock resistance and frictional wear behavior of the three coatings and matrix at 600°C, the results indicate a uniform, smooth and crack-free surface of the coating, and a good bonding between the coating and the matrix. The main mode of bonding is mechanical bonding. The average microhardness of the coating surface rises with the increasing of hard phase content, and the hardness of the section increases gradually from the matrix to the coating surface. Spot-like flaking can be observed on the H13 after thermal shock 10 times, cracks can be found on all three coatings after 15 times and cracks can be spotted on the gradient coating but falling off is not discovered after 55 times. It can be concluded that the H13 and Ni/WC coatings could improve the wear resistance of the matrix at high temperature, and the wear resistance of the gradient coating was better than that of the monolayer coating.