Method of surface modification for tool steels

Details Method of surface modification for tool steels Method of surface modification for tool steels

1997-01-10

1998-09-22

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148218, 148219, 148222, 148228, 148230, 148518, 148530, C23C 826, C23C 832

Patent

active

058109471

ABSTRACT:
The adhesive strength and hardness of chromium nitride(CrN) film deposited on SKD 61 tool steel was significantly enhanced by a nitriding process on the surface the tool steel before coating with a CrN film. These nitriding processes included nitrocarburing, gas nitriding, and plasma nitriding, respectively. After nitriding, the surface of tool steel was repolishing with grits #600, #1000, #1800 of SiC grinding paper, as well as #1000 grinding paper and diamond paste, respectively. After repolishing, the CrN film was deposited by the cathodic arc ion plating deposition process at low temperatre of 200.degree. C. The present invention was related to the process modification for enhancing the adhesive strength and surface hardness of CrN film deposited on tool steels. This method included a nitriding process and a repolishing followed by the cathodic arc ion plating deposition.

REFERENCES:
"Structure, hardness and adhesion properties of CrN films deposited on nitrided and nitrocarburized SKD 61 tool steels," F.D. LAI and J.K. WU, Surface and Coatings Technology 1996, Jan. 1997.

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