Microstructure and properties of HVOF spraying WC-10Co-4Cr coatings

摘要

Three WC-10Co-4Cr coatings were deposited with various spraying parameters (6 and 6.5 GPH kerosene flux, 1850 and 1950 SCFH oxygen flux, and 330 and 380mm spray distance) by using Parxair JP-8000 HVOF thermal spray system. The coating properties such as hardness, crystalline phase, fracture toughness, thickness per pass and abrasive wear resistance have been investigated. The results indicates that kerosene flux, oxygen flux, and spray distance have remarkable effects on coatings microstructure and performance, but only slightly effect on phase of coatings. The hardness of WC-10Co-4Cr coatings increases with the kerosene flux and oxygen flux. Both the wear loss and the fracture toughness decrease with the increasing of coating hardness. Also, the WC-10Co-4Cr coatings exhibit excellent wear resistance compared to hardening and tempering 45 steel.