Abstract
The powders of Mo 2FeB 2 cermet were prepared with Mo powders, Fe-B alloy powders and Fe powders as raw materials. Mo 2FeB 2 cermet coatings were prepared on Q235 steel by reactive thermal spraying (RTS) method and heated at 1 000 °C in vacuum oven of 1 kPa for 5 h. The properties of coatings were investigated. The results indicate that Fe 2B appears after milling for 15 h in the powder at room temperature, a part of ternary borides (Mo 2FeB 2) are generated in powder sintered at 900 °C. The coatings are composed of the major phases Mo 2FeB 2 and a-Fe, a little of Fe 2O 3, FeO and some pores. The bonding strength between the substrate and the ceramic coating is 32.73 MPa, the thermal-shock times is about 43 and the wear resistance is enhanced by approximately 5.28 times compared with that of the substrate, respectively. The comprehensive properties of Mo 2FeB 2 cermet coatings can be improved further after vacuum heat-treatment at 1 000 °C for 5 h.
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