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| Abstract No.: |
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Scheduled at:
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Monday, June 02, 2008, Room 05 11:30 AM
New Equipment 1
Latest developments in thermal spray equipment, modern multiple arc plasma guns, optimized powder feeder, new vacuum processes
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| Title: |
New process to achieve high production rates during thermal spraying of thick coatings
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| Authors: |
Volker Uhlenwinkel* / Institut für Werkstofftechnik, Germany
Lydia Achellis / Universität Bremen, Germany
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| Abstract: |
Originally, pressure-gas-atomization (PDA) was developed to generate metal powder. Due to the characteristic spray geometry, this process can be used to create thick coatings from a molten metal source. Production rates are substantially higher compared to conventional Thermal Spraying (100 ? 200 kg/h based on molten tin). The design of the atomizer governs the development of the spray cone. Normally, mean particle size and mean particle velocities are controlled by the gas flow and the gas pressure of the atomizer, respectively. Experiments were predominantly carried out with tin, but other alloys like Cu-Sn have been atomized with this process as well. A steel substrate was coated with a tin layer of several millimeters. The average density of the layer was higher than 99% with only the local density in the vicinity of the cold substrate showing lower values.
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