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1272 |
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Monday, June 02, 2008, Room 05 2:00 PM New Equipment 2 Latest developments in thermal spray equipment, modern multiple arc plasma guns, optimized powder feeder, new vacuum processes |
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Development of Wear Resistant Ceramic Coatings by HFPD |
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Maria Parco* / INASMET-TECNALIA , Spain Georgiy Barykin / INASMET-TECNALIA, Spain Ignacio Fagoaga/ INASMET-TECNALIA, Spain Carlos Vaquero/ INASMET-TECNALIA, Spain |
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The high frequency pulse detonation (HFPD) process has shown to be a cost effective spray technique for the deposition of highly dense and erosion resistant YSZ ceramic coatings. In comparison to the coatings produced by conventional APS, a significant improvement of the wear performance can be achieved by the HFPD process as result of the high coating compactness. This work deals with the deposition of ZrO2, Cr2O3 and Al2O3 ceramic powders by the HFPD techquine, for the development of highly dense and wear resistant ceramic layers. During this development, the gun configuration and the process parameters (gas flows, explosion frequency, spray distance and cinematic conditions) have been optimised to get the best deposition performance. The resulting coatings have been characterised in terms of the microstructure, the microhardness and the sliding wear performance under dry conditions. A qualitative comparison with coatings produced by conventional plasma spraying is presented and discussed. The high compactness of the coatings produced by this spray technique makes them suitable for wear protective applications. |