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Tribologischer Vergleich verschiedener mit Chrom‐Aluminium‐Nitrid beschichteter Oberflächenstrukturen
Author(s) -
Tillmann W.,
Herper J.,
Laemmerhirt I.A.
Publication year - 2013
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201300183
Subject(s) - tribology , materials science , chromium nitride , coating , physical vapor deposition , sputter deposition , deposition (geology) , lubricant , metallurgy , nanotechnology , nitride , composite material , sputtering , layer (electronics) , thin film , paleontology , sediment , biology
The reduction of friction and wear is one important goal for the extension of the tool life in many industrial applications. The forming and cutting industries in particular, are very interested in new techniques and surface coating characteristics that will improve the tribological behavior of the tools. Biomimetics is a very promising approach using biological surfaces or phenomena to optimize the properties of engineering components. The “Lotus Effect” is the most famous example, whereby surfaces are made water‐ and dirt‐repellent. Taking a closer look at nature, it can be noticed that many different natural surfaces have perfectly adapted to their environment in order to meet the respective requirements. Extending the use of natural and biological effects to improve the material performance, it was discovered that the skin of many insects has an excellent frictional behavior and thus the potential to be transferred onto technical surfaces. In this paper, the surface structure of a dung beetle (db) was investigated. The main objective was to combine nature‐adapted surface patterns with wear‐resistant near‐netshape PVD‐coatings (PVD=physical vapour deposition), in order to improve the tribological properties of a tool surface. The shell of the beetle served as a pattern for the structure of the surfaces. A substrate, composed of high speed steel material, was structured by means of milling prior to the deposition of a chromium aluminum nitride multilayer coating system, using a magnetron sputtering process. The mechanical and tribological properties of the structured and coated surfaces were compared by means of nanoindentation, ball‐on‐disc‐testing, and scanning electron microscopy.