WEAR- AND HEAT RESISTANCE OF VACUUM-ARC TiN AND TiAlN BASED COATINGS WITH Si AND Y ADDITIVES

It is shown, that insertion of silicon additives into TiN coatings and of yttrium into TiAlN coatings in explored limits (to a few wht. %) leads to increasing of rasistance against abrasive friction wear. At the same time silicon or yttrium presence in the coatings leads to loos of their columnar structure and demonstrate decrease in the cavitation resistance. It is supposed, that such distinction in behaviour of the given working performances is a consequence of that mechanisms of the coating surface fracture at action of cavitation and abrasive friction are diferent. All explored coatings of (Ti-Si)N composition are not oxidised up to 600 degrees C, and of (Ti-Al-Y) N coatings - up to 800 degrees C.