Wear Resistance of (Ti,Al)N Metallic Coatings for Extremal Working Conditions

The article includes research results for the functional properties achieved a wide range of sintered tool materials, including carbides, cermets and three types Al2O3 oxide ceramics ((Al2O3 + ZrO2, TiC SiC(w)) with (Ti,Al)N coating deposited in cathodic arc evaporation (CAE-PVD) method comparison uncoated materials. For all coated samples, uniform wear pattern on shank was observed during metallographic analysis. Based scanning electron microscope (SEM) analysis, it found that most common tribological defects identified tested materials are: mechanical abrasive side, crater formation face, cracks chipping cutting edge built-up from chip fragments. Deposition substrates increases resistance also limits exceeding critical levels permanent stresses. It even life many times over. Such significant increase results, among other things, large microhardness PVD compared to increased thermal chemical abrasion, improved removal process conditions. Use hard coatings applied is considered be one important achievements improving tools can still developed by structure solutions (sorted nanocrystalline structures) extending applications variety substrates.