Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1994-06-27
1995-05-02
Silverberg, Sam
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
427581, 427554, 148241, 148224, 148565, C23C 2410
Patent
active
054117704
ABSTRACT:
The surface of stainless steel can be hardened by coating a silicon nitride gel and then scanning by CO.sub.2 laser to form a surface alloy layer thereon. The thickness and hardness of the surface alloy layer are both uniform. The Vicker's hardness of the layer can be as high as 1200 Hv. This method can be operated in a common atmosphere or nitride atmosphere at normal pressure, therefore it is more economic than ion nitriding or plasma nitriding.
REFERENCES:
patent: 4212900 (1980-07-01), Serlin
Lai Tai-hwang
Lee Ju-Tung
Tsai Wen-Ta
National Science Council
Silverberg Sam
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