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为了研究低功率等离子喷涂中工作气体成分对涂层结构和硬度的影响规律,在试验中我们分别使用了氩 氢和氩 氮等离子炬,在输入相同功率(5kW)的条件下,改变混合气体中氢气与氮气的百分含量,来喷涂Al2O3 TiO2涂层.结果表明,用氩 氮等离子炬喷涂的涂层比较粗糙,相图中层间距较大,气孔较多;而用氩 氢等离子炬喷涂的涂层则比较均匀,层间距比较小,气孔也比较少,涂层比较致密,其硬度明显高于氩 氮等离子炬喷涂的涂层,Hv可以达到1243kg·mm-2.
In order to study the influence of working gas composition on the structure and hardness of the coating in low-power plasma spraying, we used argon-argon and argon-nitrogen plasma torches respectively to change the mixed gas at the same power (5kW) Hydrogen and nitrogen were used to spray the Al2O3 coating.The results show that the coating sprayed by argon plasma torch is rough, the interlayer spacing is larger and the porosity is larger in the phase diagram, while the coating with argon-hydrogen plasma torch The layer is relatively uniform, the spacing between layers is relatively small, the pores are relatively small, the coating is relatively dense, and its hardness is obviously higher than that of argon-nitrogen plasma torch sprayed coating, Hv can reach 1243kg · mm-2.