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1549 |
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Thermal spraying of precipitation hardening copper alloys |
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Thomas Grund / Institute of Materials Science and Engineering, IWW, Chemnitz University of Technology, Deutschland Bernhard Wielage / Chemnitz University of Technology, Institute of Composite Materials, Germany Sascha Ahrens*/ Chemnitz University of Technology, Institute of Composite Materials, Germany Oliver Brandt/ becon technologies GmbH, Switzerland Guido Reisel/ Sulzer Metco Woka GmbH, Germany |
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For many applications such as plug-in connectors in electronic devices or ingot molds in steel production processes, a high demand for wear resistant coatings simultaneously showing high thermal conductivity exists. These special requirements can be achieved by precipitation hardened copper alloy coatings. High wear resistance can be attributed to the creation of intermetallic phases during the precipitation hardening process. Deposition of such coatings by use of different thermal spraying techniques is tested. Spray feedstock, spraying processes and the associated configurations of these coatings are optimized with respect to coatings being sufficiently wear resistant in the sprayed state. Applied thermal spray processes are LPPS, Electrical Arc Spraying and HVOF. The precipitation hardenable copper alloys that are tested are CuBe and CuCoBe. These chosen alloys are state-of-the-art materials, used as bulk material in applications requiring high wear resistance and high thermal conductivity. Final coatings are examined by means of optical microscopy and EDXS analysis. Micro hardness is measured and compared with values reached for bulk materials. |