• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2024, Vol. 60 ›› Issue (4): 296-304.doi: 10.3901/JME.2024.04.296

Previous Articles     Next Articles

First-principles Calculations on Interface Behavior of Ni/WC Composite Brazed Coatings

WANG Xingxing1,2, WU Gang1, HE Peng2, YANG Xiaohong3   

  1. 1. Henan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou 450045;
    2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001;
    3. Academician Expert Workstation, Jinhua Polytechnic, Jinhua 321017
  • Received:2023-05-08 Revised:2023-12-10 Published:2024-05-25

Abstract: Ni/WC composite coating has been widely used in agricultural machinery, mould processing and new energy resources fields for its high hardness, high wear resistance and low friction coefficient. The first-principles calculation is used to study the Ni(111)/WC(0001) interface and Ni(111)/W2C(0001) interface behavior in Ni/WC composite brazed coating of construction machinery. The influence of W2C on the wear resistance of WC-reinforced Ni matrix composite brazed coatings is discussed. The calculation results reveal that the 5 atom-layers Ni(111) surface, 9 atom-layers WC(0001) surface and 9 atom-layers W2C(0001)surface are selected to represent the block characteristics. Among the six stacking sequences, the highest Wad(adhesion work) is 7.42J/m2 at B site from C-terminated structure of Ni(111)/WC(0001) interface, then the interface bonding strength is the highest. The systematic analysis of the electronic structures at different interfaces shows that Ni atoms are more likely to bond with C atoms, the properties of bonds between Ni and C atoms are mainly ionic bonding, and the properties of metallic bonding between Ni atoms at the interface are much weaker than non-interface Ni atoms.W2C phase should be strictly controlled at the coating interface. The theoretical basis is provided for the manufacture of high wear resistance, high hardness and high strength composite coatings.

Key words: Ni/WC coating, brazing, interface behavior, first principle calculation, adhesion work

CLC Number: