棒材等离子喷涂制备非晶态合金雾化过程的数值模拟及工艺参数的制定

Preparation of amorphous alloy atomization process numerical simulation and the formulation of process parameters by bar plasma spray

根据已有的火焰喷涂一维稳定流动学研究的成果,提出棒材等离子喷涂法制备非晶涂层的雾化机理并计算了棒材等离子喷涂法制备非晶时雾化粒子的中值粒径。同时改变棒材等离子喷涂中主气压力和辅气压力两个主要参数,优化了铁系非晶涂层制备工艺。结果表明,3mm Fe80P13C7及Fe72Cr8P13C7的晶体棒材通过大气等离子喷涂,在喷涂电压为55V,喷涂电流为600A,棒材与喷嘴的距离为4mm,送棒速率为50mm/min,喷涂距离为100mm,喷涂角度≈90°,主气压力为0.95MPa,辅气压力为0.35MPa喷涂可制备非晶涂层。

In accordance with past achievement in one-dimensional stable fluid dynamic by flame spray,an atomization mechanism was provided in preparation of amorphous coating by bar material plasma spraying.It is found that the measured particle median diameter agree well with those obtained by numerical simulation.It shows that the mechanism of atomization is feasible by bar material plasma spaying.Two main process parameters are optimized to produce ferrous amorphous coating;the parameters includes primary gas pressure and secondary gas pressure.The results show that it can be obtained amorphous coating with 3mm crystal bar Fe80P13C7 and Fe72Cr8P13C7.The spray coating process parameters are as follows： spraying electric voltage of 55V,spraying electric current of 600A,distance between nozzle and bar of 4mm,bar velocity of 50mm/min,spraying distance of 100mm,spraying angle about of 90°,primary gas pressure of 0.85MPa and secondary gas pressure of 0.32MPa.