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Microstructure and Tribological Properties of Microarc Oxidation Coatings Formed on TA15 Alloy

Author: LuJianLiang
Tutor: WangYaMing
School: Harbin Institute of Technology
Course: Materials Science
Keywords: TA15 Micro- arc oxidation coating Organizational structure Tribological properties High temperature oxidation resistance
CLC: TG174.4
Type: Master's thesis
Year: 2008
Downloads: 41
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Abstract


In order to get a good anti-friction and high temperature oxidation resistant coating in TA15 alloy surface Si-P-Al, P-Al and PB-Al three electrolyte micro-arc oxidation test. Using SEM and XRD analysis revealed the formation mechanism of the coating the coating microstructure and tribological performance of the coating with high temperature oxidation resistance. The test showed that the coating inner layer is dense, the outer loose surface multiple micropores (pore size 5μm). The same electrolyte in coating thickness, roughness with a pulse voltage, the duty cycle, the increase of the oxidation time increases, the increase of the pulse frequency decreases, the coating growth rate and surface morphology are mainly composed of a single pulse discharge energy decision. The organizational structure of the coating depends on the electrolyte system: Si-P-Al system coating composition by the rutile and anatase TiO2, and containing a small amount of amorphous compound; the phase composition of the P-Al system coating consists Al2TiO5; PB- the Al system coating Al2TiO5 which contain a small amount of Al2O3 and TiO2 phase. Dry Sliding unpolished Si-P-Al system of 20 μm thick coating of friction coefficient of about 0.15 under different loads, and long-term stable, with good antifriction properties; Si-P-Al system 40μm thick coating of friction coefficient is high, a low coefficient of friction 1N under a load in the surface after polishing and stabilized at around 0.15. P-Al system coefficient of friction of the coating under different loads before and after polishing were higher, the coefficient of friction over TA15 substrate after 1000 cycles. PB-Al system coating under different loads before and after polishing, have excellent antifriction properties (friction coefficient of approximately 0.15). Sliding dry friction coefficient depends mainly on the surface morphology and phase structure, low surface roughness of the coating after polishing conducive to reducing the coefficient of friction, determine their self-lubricating properties of nano-TiO2 Si-P-Al system coating With the best friction-reducing properties. The grease sliding friction, the friction coefficient of TA15 alloy micro-arc oxidation coating decreased to about 0.15, and the long-term stable, reduce the coefficient of friction in dual friction surface to form a continuous lubrication film. 700 ℃ under high temperature oxidation 80h, TA15 alloy surface to generate a thickness of about 10μm containing rutile TiO2 and Al2O3 porous oxide film, oxidation weight gain 0.76mg/cm2; Si-P-Al and P-Al system of micro-arc oxidation coating the oxidation of weight gain were 0.14mg/cm2 and 0.38mg/cm2 Si-P-Al system has excellent high temperature oxidation resistance coating.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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