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

Coatings

Klaudiusz Gołombek¹  Jarosław Mikuła¹  Ludwina Żukowska¹  Daniel Pakuła¹  Antonín Kříž² 

[1] Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, 18a Konarskiego Street, 44-100 Gliwice, Poland;Department of Materials and Metallurgy Engineering, Faculty of Mechanical Engineering, University of West Bohemia, Univerzitni 22, 30614 Plzen, Czech Republic;

关键词: sintered tool materials;    PVD;    coatings;    metallic coatings;    ceramic coatings;    wear resistance;   

DOI  :  10.3390/coatings11020157

来源: DOAJ

【 摘 要 】

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

【 授权许可】

Unknown