Mechanical Properties After Isothermal Treatment Of Wc-co Thermal Spray Layer

Thermal spraying technology has extensive application in industry. The advantage of thermal spraying technology is high efficiency and wide selecting suitable materials, it can get coating on big work piece, which is other surface technology can't be obtained.But the bonding strength of the thermal spraying coating is not high enough.It is easy to shed while it is working.In order to improve the wear resistance of the coating,under the higher bonding strength condition,we introduce cemented carbide into the field of thermal spraying.The purpose is to getting high-wear-resistance coating by using the high hardness and better wear resistance characteristics of cemented carbide.WC-12Co powder was spayed to Q235 basal body,by means of the sub-velocity of sound flame powder spraying equipment The bonding strength,surface microstructure hardness, the friction coefficient and wear resistance of the coating were studied with Mid-temperate treatment under the H₂ protection atmosphere.The main results had obtained as follow:[1] Under the same Mid-temperate treatment condition, in the certain range ,the bonding strength of the WC coating improves with the increasing of the Cu in the WC powder. [2] The bonding strength can be improved by a oxidation-deoxidation reactionbefore the thermal spraying and Mid-temperature treatment. [3] About 8 percent of the wearing spraying comes from WC coating ,and theother 92 percent comes from GCr15. [4] The friction coefficient of WC Mid-temperature treatment coating/GCr15 ishigher than the Q235/GCr15 one.[5] The wear resistangce of WC-Co Mid-temperature treatment coating is improved about 45 percent than the non-treated one under the H₂ protection atmosphere.[6] The wear mechanics of WC-Co Mid-temperature treatment coating is brittle spalling and abrasive wear.