Effects of Substrate Quenching after TiN Coating on Tribological Properties of TiN Film

Abstract

To investigate the effects of post-coat substrate quenching on the tribological properties of TiN film, a specimen was prepared in which the steel substrate (carbon tool steel, JIS SK3) was quenched after TiN coating, and the ball-on-disk type wear test was carried out using a ZrO 2 ball. The delamination initiation life of TiN film was improved by the high adhesive strength of TiN film obtained by post-coat substrate quenching. The specific wear rate was also improved by post-coat substrate quenching, although TiN hardness was lower than that of the conventional type specimen, which was coated with TiN after substrate quenching. The improvement in the specific wear rate could be explained as follows. In the post-coat substrate quenching process, TiN was partly oxidized and titanium oxide, which acted as a lubricant, was formed on the TiN surface. The formation of titanium oxide resulted in a reduction in the friction coefficient and consequently a lower specific wear rate was obtained.

Strengthening of Ceramic Coated Steel by Laser Quenching

“…When the substrate is quenched after the coating process, the appropriate hardness of the steel can always be obtained regardless of whether the deposition temperature is lower than the tempering temperature. In addition, in our studies for TiN coated steel, it was shown that the adhesive strength [1,2], wear resistance [3] and fatigue strength [4] of TiN coated steel could be improved easily and effectively by the substrate quenching after coating. These results suggest that the substrate quenching after ceramic coating might be an effective method to improve the performance of TiN coated steels.…”

“…These results suggest that the substrate quenching after ceramic coating might be an effective method to improve the performance of TiN coated steels. In our previous studies [1][2][3][4][5], the heat treatment for TiN coated steel has been carried out by an electric furnace. The high thermal distortion due to this bulk heat treatment is the main disadvantage of this method, in particular to parts of high dimensional accuracy.…”

Influence of Laser Heat Treatment on Fracture Strength of Ceramic Thin Film

“…It was found that quenching after coating allows for adequate steel hardness control regardless of the environment temperature during the process. Additionally, from a study conducted on TiN-coated steel, we were able to conclude that adhesive strength [1,2], wear resistance [3] and fatigue strength [4] of the TiN-coated steels improved significantly through substrate quenching after coating. These results suggest that this method can be applied as an effective way to improve the performance of TiN-coated steels.…”

“…These results suggest that this method can be applied as an effective way to improve the performance of TiN-coated steels. In the previous studies [1][2][3][4][5], the TiN-coated steel was heat treated in an electric furnace. In this method, it is difficult to avoid thermal distortion due to bulk heat treatment, what is a disadvantage when high dimensional accuracy is required.…”

Flaking Initiation Life under Rolling Contact Fatigue of Ceramic Coated Steels Quenched after Coating Process

“…In order to confirm the further effectiveness of the substrate quenching after coating from more practical viewpoint, the wear resistance 5,6 and fatigue strength 7 of the ceramic coated steels processed by this method have been investigated, and the improvement of wear resistance and fatigue strength were also confirmed. From these results, ball bearing is thought to be one of the good applications of this method.…”