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2644 |
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Tuesday, September 27, 2011, Saal C2.1 11:25 AM Wear Protection 1 |
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Influences of process and material morphology in the case of carbide coatings |
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Jim Girgulis / Sulzer Metco, Switzerland Alexander Barth* / Sulzer Metco , Switzerland Dianying Chen/ Sulzer Metco, USA Chris Dambra/ Sulzer Metco, USA |
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Carbide coatings are widely used to reduce wear of parts. In most cases the coatings are applied with the HVOF process. Recent advances have extended the typical plasma system operating window to include supersonic plasma jets with the use of a high velocity expansion nozzle. In a standard plasma system configuration carbide coatings can be produced at very high deposition efficiencies. This paper investigates the unique properties of plasma applied carbides at particle velocities of 600-900 m/s. The focus of the investigation is the corrosion and wear properties as compared to traditional HVOF GF and LF applied carbide coatings. Generic laboratory data including coating structure, stress build-up, porosity and hardness is linked to wear, erosion and corrosion resistance data. In addition economic considerations are discussed and evaluated. The investigation will also be extended to include the effects of carbide material morphology resulting from varying production technologies. The influence on the coating and process properties is presented in connection with the different processes. This study is intended to provide a broad picture of thermally sprayed carbide coatings to assist in determining a coating solution for a specific application balancing economic and qualitative aspects. |