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以Mo粉、FeB合金粉、Fe粉为原料,将混合粉末在900℃下真空热处理2h,破碎,过75μm筛制备喷涂喂料;采用反应火焰喷涂技术在Q235钢表面制备Mo2FeB2金属陶瓷涂层。将反应热喷涂制备的涂层在真空炉中1000℃下热处理5h,测试涂层的性能。结果表明:在室温球磨15h后粉体中有Fe2B生成,在900℃下烧结后破碎的喷涂粉末中有部分三元硼化物(Mo2FeB2)生成;涂层由占主体的Mo2FeB2和α-Fe相和少量Fe2O3、FeO相及气孔组成。在涂层和基体的结合面处,存在由高硬度涂层到低硬度钢基体的过渡区;涂层和基体的结合强度为32.73MPa,抗热震次数可以达到43次左右,耐磨性比钢基体提高5.28倍;涂层经过1000℃真空扩散热处理后,具有更加优异的力学性能。
The Mo powder, FeB alloy powder and Fe powder were used as raw materials, and the mixed powder was vacuum heat-treated at 900 ℃ for 2h, crushed and sieved through a 75μm sieve to prepare a spray feed. Mo2FeB2 cermet coating was prepared on the Q235 steel by reactive flame spraying. The coating prepared by reactive thermal spraying was heat treated at 1000 ℃ for 5 h in a vacuum furnace to test the coating performance. The results showed that Fe2B was formed in the powder after ball milling at room temperature for 15h, and some ternary boride (Mo2FeB2) was formed in the powder after sintering at 900 ℃. The coating consisted mainly of Mo2FeB2 and α-Fe phases A small amount of Fe2O3, FeO phase and stomatal composition. There is a transition zone from the high hardness coating to the low hardness steel substrate at the bonding surface of the coating and the substrate. The bonding strength between the coating and the substrate is 32.73 MPa, the number of thermal shock resistance can reach about 43 times, and the abrasion resistance ratio Steel substrate increased by 5.28 times; after 1000 ° C vacuum diffusion heat treatment, the coating has more excellent mechanical properties.