574 Prakt. Met. Sonderband 30 (1999) 
failure mechanism of these coatings due to scratching, initiated by minute fractures and terminating 
with fragmentation of coating due to plastic deformation of the substrate, does not cause total 
delamination of the coating in spite of some local chipping connected with this effect. 
3. The titanium carbonitride Ti(C,N) coatings demonstrate double erosion resistance compared to 
the titanium nitride TiN coatings. Erosion resistance increases along with the increase of the coating 
hardness. Coating thickness and critical load value, featuring the measure of the coating adherence 
to the substrate from high-speed steels do not have any significant effect on the erosion resistance 
of the coated steels. The erosion failure process of the investigated TiN and Ti(C,N) coatings 
commences in many locations, often in pits left after the solidified titanium drops, joining later into 
failure islands initiating origination of craters growing at a uniform rate after total perforation of the 
coating. 
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