Abstract
The recent demand for energy saving and environment compatibility has of late accelerated the development of the technologies for the improvement of wear resistance and fatigue reliability of tools, dies and mechanical parts for the purpose of efficient boundary surface hardening. The technology that attracts special attention recently is the duplex surface treatments which process the coating of ceramics on to the work pieces after they have been surface-treated by carbonizing, nitriding and etc. The primary factor for the advancement of this type of surface modification is considered to lie in the binding of the base metal and the ceramic coating. Scratch tests and microscope analysis of the scars were performed on (1) High-speed tool steel (SKH51) on which physical vapor deposit TiN hard coating was formed after Radical nitriding. (2) High-speed tool steel (SKH51) on which TiN PVD coating was formed directly. The results show that in the case of duplex surface treatment which improved hardness of the base metal, very high degree of binding was confirmed in the scratch tests. Besides, observations of the scratch tracks showed the different types of damage on TiN coatings between (1) duplex treatments and (2) direct coating.
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