Wear Behavior of Plasma-Sprayed Al-Si/TiB 2 /h-BN Composite Coatings
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JTTEE5 19:384–391 DOI: 10.1007/s11666-009-9388-0 1059-9630/$19.00 ASM International
Wear Behavior of Plasma-Sprayed Al-Si/TiB2/h-BN Composite Coatings I. Ozdemir, C. Tekmen, Y. Tsunekawa, and T. Grund (Submitted April 24, 2009; in revised form July 27, 2009) In this study, mechanically alloyed Al-12Si/TiB2/h-BN composite powder was deposited onto aluminum substrates by atmospheric plasma spraying. Wear performance of the coating was investigated with respect to the structural evolution of the composite powder coating. Non-lubricated ball-on-disk tests were used to examine the wear resistance of the coatings. The worn surfaces were examined using scanning electron microscopy and energy dispersive spectroscopy to elucidate the wear mechanisms operating at the sliding interface. It has been observed that TiB2 and in situ formed AlN and Al2O3 phases in combination with h-BN solid lubricant strongly affect the wear performance of the coating.
Keywords
aluminum composites, APS coatings, friction and wear, influence of spray parameters
1. Introduction Al-Si alloys are attractive in the production of internal combustion engine components due to their low density, favorable thermal properties, excellent corrosion resistance, and process flexibility. However, the major drawbacks of these alloys are a low hardness and a low wear resistance under loaded sliding conditions. Compared to other modification technologies, thermal spray processes have already found a wide application area in different industries by deposition of metallic, ceramic, or composite materials (Ref 1-4). Thermal spraying is an extremely fast deposition process for surface coatings with a thickness of over 100 lm. The deposition rate is approximately 1-10 mm/s or even more, which is at least 10 times higher than those of other conventional vapor phase deposition
This article is an invited paper selected from presentations at the 2009 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Expanding Thermal Spray Performance to New Markets and Applications: Proceedings of the 2009 International Thermal Spray Conference, Las Vegas, Nevada, USA, May 4-7, 2009, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2009. I. Ozdemir, Department of Metallurgical & Materials Engineering, Bartın University, 74100 Bartın, Turkey; C. Tekmen and Y. Tsunekawa, Materials Processing Laboratory, Toyota Technological Institute, 2-12-1 Hisakata Tempaku, 468-8511 Nagoya, Japan; and T. Grund, Fakulta¨t fu¨r Maschinenbau, Technische Universita¨t Chemnitz, Lehrstuhl fu¨r Verbundwerkstoffe, Erfenschlager Str. 73, 09125 Chemnitz, Germany. Contact e-mail: [email protected].
384—Volume 19(1-2) January 2010
methods and conventional electroplating. Ceramic particles of SiC, TiB2, B4C, TiC, or Al2O3 can be used to reinforce thermally sprayed Al-based coatings to improve their anti-wear performance. Among t
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