Abstract
The metallugical structure and wear resistance of TiN film formed on high C-high Cr roll steel specimens by ion beam and vapor deposition (IVD) and chemical vapor deposition (CVD) techniques were studied. The main results obtained were as follows: 1) Two-cylinder wear resistance tests showed that the IVD and CVD films significantly improved the were resistance of high C-high Cr roll steel. Wear resistance of IVD specimens was better than that of CVD specimens. 2) The concentration of Ti varied continuously in the IVD and CVD specimens in the boundary zone between the base metal and the coated film. The width of the transition region in the IVD was comparable to that of CVD specimens. Good adhesion of the IVD specimens can be explained in terms of the existence of mixed layer in the boundary zone. 3) Both the films always consisted of TiN as a main compound and TiO2 as an additional one. The ratio of TiO2 to TiN in CVD film was larger than in IVD film. The ratio of TiO2 to TiN contents differed corresponding to film formation techniques, and had a clear correlation to wear resistance.It is suggested that the IVD technique is most suitable for application to an actual roll.
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