Author/Editor		Navinšek, B; Panjan, P; Milošev, I
Title		Industrial applications of CrN (PVD) coatings, deposited at high and low temperatures
Type		članek
Source		Surf Coat Tech
Vol. and No.		Letnik 97
Publication year		1997
Volume		str. 182-91
Language		eng
Abstract		Industrial applications of CrN (PVD) coatings are entering an expanding but selective range of mass manufactured goods. They may be prepared as single, low and high temperature CrN coatings and double TiN + CrN coatings. In this work, depositions of CrN at high temperatures were performed by a low voltage thermionic arc in a BAI 730M apparatus, while at low temperatures (below 250 degrees C), the plasma-beam sputtering process in a SPUTRON apparatus was used. We studied the following critical parameters that influence the quality of the coatings and applied the performance tests used inindustrial practice: adhesion and scratching coefficient, microhardness, surface topography, oxidation and corrosion resistance. The performance tests were made with the assistance of technicians as well as in 12 Slovenian factories. CrN coatings were deposited at 480 degrees C for wear and corrosion protection in cold forming and cutting of copper in commutation manufacturing, in forming of aluminium components in automotive production and for surface improvement of moulds (made of H11 steel) in Al-Si die casting under pressure. Deposition temperatures of 180-220 degrees C, obtained in the SPUTRON apparatuse were required to improve cold forming tools made of alloyed tool steels (e.g. D2 and D3). The lowest obtainable temperature of 140 degrees C in the SPUTRON gave a CrN coating of high quality for practical use. These coatings were used to protect electrodeposited and electropolished nickel moulds (models) in artificial teeth production. Double TiN + CrN coatings were used as a highly abrasive resistant coating in the production of rotors (in the electromotor industry), and in cold forming and forging in mass manufacturing of screws. The results and performance test were compared with the available data, mostly published of norming, milling, deep drawing of copper, nickel and titanium and their alloys, and on die casting of aluminimum and Al-alloys.
Descriptors		CHROMIUM COMPOUNDS TITANIUM CORROSION ALLOYS