文中提出了一种新的渗铝方法-辉光加热膏剂渗入法,将涂有渗铝膏剂的试样置于阴极空腔中,在辉光放电作用下实现离子渗铝。渗铝膏剂经优选,选出最佳配方:(wt％)Al 40％,Na_3AlF_6 5％,KBF_4 5％,SiC 50％,用此配方在低碳钢表面1050℃×2h渗铝,其渗铝层厚度可达230μm。渗铝后,试样的抗氧化性可提高2～3倍。此方法具有渗入速度快,表面质量好,可方便地实现局部渗铝等优点。文中还讨论了渗铝机理。
A new aluminizing method, the paste plasma aluminizing by hollow cathode, was developed. The optimum paste composition was obtained by orthogonal test method to be 40wt% Al, 5wt% NasAlFe, 5wt% KBF4, 50wt% SiC. The aluminizing was carried out at 1050℃ for 2h. The aluminized layer was 230 μm thick. The treatment increased oxidation resistance of low carbon steel by 2-3 times. The diffusion mechanism of this aluminizing process was discussed. Its advantages included quick diffusion speed, good surface quality and the possibility of localized aluminizing.
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