Oerlikon Metco WOKA GmbH
Oerlikon Metco WOKA GmbH
Dorner-Reisel A.,Hochschule Schmalkalden |
Scholz M.,Hochschule Schmalkalden |
Svoboda S.,Hochschule Schmalkalden |
Hepp R.,Oerlikon Metco WOKA GmbH |
Reisel G.,Oerlikon Metco WOKA GmbH
Tribologie und Schmierungstechnik | Year: 2017
Tungsten carbide (WC) reinforced NiBSi coatings were deposited on mild steel S 235 by plasma transferred arc welding. The WC fraction was 60 %. A commonly used testing routine for hardfacings is ASTM G65 rubber wheel abrasion test. In practical applications, there are usually combinations of the basic wear mechanisms. The translatory oscillation test with hard counterbodies may be an additional or alternative test aecording to the special envisaged practical application. There is a high degree of sliding applied. For some applications such test conditions may be more suitable or are a good Supplement to ASTM G65. In the present contribution WC-Co and AI2O3 balls were used as counterbodies against WC/NiBSi-coated flats. The wear tests are performed under dry conditions or engine oil lubrication. Although, the coefficient of friction (COF) is lowest under engine oil lubrication, a higher wear rate was evident on the WC-NiBSi PTA cladded overlay, if engine oil is used. In the case of Sandy oils, there are sliding of the counterbody ball against the PTA coating as well as microabrasion due to moving sand particles. The fluid properties of the oil in terms of viscosity, wettability of the sand particles and its transport in the oil may be essential.
Lyphout C.,University College West |
Bjorklund S.,University College West |
Karlsson M.,Oerlikon Metco WOKA GmbH |
Runte M.,Oerlikon Metco WOKA GmbH |
And 2 more authors.
Journal of Thermal Spray Technology | Year: 2014
Replacement of electrolytic hard chromium method by thermal spray technology has shown a growing interest in the past decades, mainly pioneered by depositing WC-based material by conventional HVOF processes. Lower thermal energy and higher kinetic energy of sprayed particles achieved by newly developed Supersonic Air Fuel system, so-called HVAF-M3, significantly reduces decarburization, and increases wear and corrosion resistance properties, making HVAF-sprayed coatings attractive both economically and environmentally. In the present work, full factorial designs of experiments have been extensively utilized to establish relationships between hardware configurations, process and engineering variables, and coatings properties. The relevance of those process factors is emphasized and their significance is discussed in the optimization of coatings for improved abrasion wear and corrosion performances. © 2014, ASM International.