%0 Journal Article
%T Development of Machining Processes for the Use of Multilayer High-Performance Coatings
%A Sebastian Goeke
%A Tobias Br¨¹ggemann
%A Dirk Biermann
%J ISRN Tribology
%D 2013
%R 10.5402/2013/750251
%X The development of corrosion- and wear-resistant high-performance coatings is important to improve components of mobile and stationary turbines, aerospace undercarriages, combustion engines, and hydraulic modules. New micro- and nanostructured coating materials and processes to machine these coatings are developed in order to increase the performance of workpieces and components, to enhance durability, and to reduce maintenance and manufacturing costs. At the Institute of Machining Technology (ISF), milling and grinding procedures have been developed for the preparation of the workpiece surface for the subsequent coating process. In contrast to conventional applications, the workpieces are not manufactured with the aim of achieving a minimized resulting surface roughness. Instead of this, a defined and adequate structure has to be generated, providing a good adhesion of the thermal sprayed coating on the workpiece surface. After first coating of the prepared substrates by a High-Velocity-Oxygen-Fuel (HVOF) coating process, the resulting surface topography does not have the required surface quality for a subsequent (Diamond Like Carbon) DLC coating process. In order to generate a more uniform surface structure, the deteriorated surface resulting from the HVOF coating process also has to be processed. Therefore, the application of an adapted grinding process with diamond wheels is used. 1. Introduction To increase the wear, erosion, and corrosion resistance of tribologically stressed functional surfaces, the use of thermally sprayed coatings increases. Typical applications for these slide or bearing surfaces are stationary turbines, aerospace undercarriages, combustion engines, and hydraulic modules [1]. One of these thermal spraying processes is the High-Velocity Oxygen Fuel (HVOF). Based on the high particle velocity a low porosity, high bond strength, and an increased hardness are the main advantages of this thermal spraying process [2, 3]. In order to obtain a good adhesion between the coating and the substrate, it is necessary to prepare the substrate surface. Although coinciding with several disadvantages, such as the necessity to clean the workpiece and the costs, a blasting process is usually used to activate the surface. In order to circumvent these disadvantages, other machining processes have to be considered. Obtaining unique surface structures which are similar to blasted surfaces regarding the roughness is also possible with other machining processes. These machining processes may be milling, grinding, or honing, for example. Depending on
%U http://www.hindawi.com/journals/isrn.tribology/2013/750251/