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2004 |
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Wednesday, May 05, 2010, Moor Room 9:20 AM Nanomaterial Coatings 2 |
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Fabrication and characterization of Al2O3-SiC-nano-composite powders and HVOF sprayed coatings |
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Tomi Suhonen* / VTT Technical Research Centre of Finland, Finland Tommi Varis/ VTT Technical Research Centre of Finland, Finland Ulla Kanerva/ VTT Technical Research Centre of Finland, Finland Juha Lagerbom/ VTT Technical Research Centre of Finland, Finland Outi Söderberg/ TKK Helsinki University of Technology, Finland Yanling Ge/ TKK Helsinki University of Technology, Finland Xuwen Liu/ TKK Helsinki University of Technology, Finland Simo-Pekka Hannula/ TKK Helsinki University of Technology, Finland |
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The capability of the high velocity oxy-fuel (HVOF) thermal spray process to produce denser coatings compared to those produced by other ambient thermal spray processes is well known. The possibility to produce high-density nanocomposite ceramic coatings offers new high performance applications in the field of wear and corrosion resistance. Nanoreinforced ceramic structures have been used to improve the toughness of bulk ceramics and such improvements have been reported also for HVOF-sprayed ceramic coatings made from composite ceramic powders. Nano-grain size is not only shown to be beneficial for the mechanical properties of the coating, but also for the processing (reduced sintering temperatures) in powder manufacturing and coating deposition (increased deposition efficiency). The challenge is to transfer the nanosized powder into a coating having a desired nanostructure. In this paper the structure as well as mechanical and wear properties of the thermally sprayed SiC-particle reinforced alumina coatings are presented. |