Thermal spray technology GTV Verschlei223;schutz（热喷涂技术制造Verschlei223;舒茨的作品）.pdf

Thermal spray technology - Applications - Applications of thermal spray coatings Applications - HVOF coatings - Applications of HVOF coatings 1 Typical spray materials Cermets: WC/Co(Cr), WC/Ni(/Cr C ), Cr C /NiCr 3 2 3 2 Hard alloys: NiCrBSi, CoCrWC, CoCrMoSi, FeCrC Aim Wear protection for surfaces of components build of cheap base materials or base materials that fufill structural demands (strength, formability) in an optimal way; especially for dynamically loaded components (ceramics are not applicable due to not sufficient damage tolerance) Partially in combination with corrosion protection Abrasion resistant rough surfaces for secure fixation of components without damage of their surfaces (e.g. for Forming processes) or for transportation of piece goods (e.g. grippers, carrier rollers) Wear protection Hydro power plants Pelton-, Francis- and Kaplan turbine blades Especially for water with high content of abrasive particles (e.g. Huang He) HVOF WC/Co coatings are much superior to polyurethane Kaplan turbine Pelton turbine Francis turbine Wear protection 2 Doctor blades Improvement of edge stability and thereby also of lifetime compared to uncoated spring steel as well as APS Al O /TiO 2 3 2 or Cr O coated blades 2 3 Coating material: WC/Co 88/12 Wear protection Doctor blades Cont