N2/H2 Non-thermal Transferred arc Plasma Nitriding Treatment of Stainless Steel at Atmospheric Pressure
N2/H2 Non-thermal Transferred arc Plasma Nitriding Treatment of Stainless Steel at Atmospheric Pressure
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DOI：
10.1007/s11090-020-10103-0
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发表时间：
2020-07
影响因子：
3.6
通讯作者：
Q. Guo;Y. J. Zhao;G. Ni;L. Li;Q. Lin;S. Sui;H. Xie;W. Duan
中科院分区：
文献类型：
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作者：
Q. Guo;Y. J. Zhao;G. Ni;L. Li;Q. Lin;S. Sui;H. Xie;W. Duan
本文提出了一种利用常压非热传递电弧等离子体技术进行金属表面氮化的新方法。在N2/ h2等离子体渗氮过程中，不锈钢表面经过弧根处理，高速相机观察到弧根在直径约5mm的圆形区域内不规则运动。放电具有高电压、低电流的特点，采用双原子分子N2+（B2Σu+→X2Σg+）拟合方法测定电弧柱等离子体的气体温度仅为2900 K左右。研究发现，等离子体中NH自由基的产生在渗氮过程中起着重要作用。在最佳实验条件下，处理120 min后，渗氮层厚度可达60 μm。经等离子体处理后，不锈钢的表面硬度由220提高到1200 HV0.1左右（0.1 kg力下的维氏硬度）。不锈钢表面硬度达到1200hv0.1时，处理饱和时间为9min左右。
In the paper, a novel metal surface nitriding method is presented by using an atmospheric pressure non-thermal transferred arc plasma technique. In the N2/H2plasma nitriding process, the surface of stainless-steel is treated by the arc root, which shows an irregular movement in a circle-like zone with about 5 mm diameter observed by high speed camera. The discharge has characteristics of high voltage and low current, and the gas temperature of the arc column plasma is only about 2900 K determined by the diatomic molecule N2+(B2Σu+→X2Σg+) fitting method. It is found that the NH radical production in plasma plays an important role in the nitriding process. The thickness of nitrided layer can reach 60 μm after processing of 120 min under the optimal experimental conditions. The surface hardness of stainless-steel increased from 220 to about 1200 HV0.1(Vickers hardness under the force of 0.1 kg) after plasma treatment. The treating saturation time for stainless-steel surface hardness reaching to 1200 HV0.1is around 9 min.