Abstract
Nitriding steel sample SACM 645 was nitrided by active screen plasma nitriding using a titanium double screen to form simultaneously TiN coatings/nitrogen-diffusion layer on the sample surface. The sample was placed on the sample mount of the various materials (SACM 645, Cu, Ti and SiO2-Al2O3). The sample with the mount was placed on the sample stage in a cathodic potential. A titanium double screen was placed on the cathodic stage around the mount. Active screen plasma duplex processing were performed in 75% N2 + 25% H2 atmosphere for 18 ks at 823 K under 100 Pa. In each sample, the hardness of the sample surface was high and beneath compound layer, the hardness decreased rapidly with the distance from the surface, following a flattening of the profile. Wear loss of each duplex-processed sample decreased than that of untreated sample. Particularly, wear loss of the sample using the Ti mount considerably decreased.
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