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The High Temperature Oxidation Properties of Gradient Nano (Ti, Al) N Coating on 1Cr11Ni2W2MoV Stainless Steel

Author: WangYiHan
Tutor: YangShiWei
School: Harbin Engineering University
Course: Materials Physics and Chemistry
Keywords: 1Cr11Ni2W2MoV stainless steel Arc ion plating ( Ti , Al ) N coating High temperature oxidation resistance
CLC: TG174.44
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


With the improvement of the aero-engine compressor blades operating temperature , in order to improve the service stability of the blade and extending its life by arc ion deposition gradient nano ( Ti , Al ) N coatings prepared on the compressor blades , blade material stainless steel 1Cr11Ni2W2MoV . Based on standard GB/T13303-91 \furnace temperature oxidation test, high temperature oxidation test at a temperature of 750 ° C for 200h . The test data analysis and processing, drawing its oxidation kinetics curves . By scanning electron microscopy , energy dispersive spectroscopy , X - ray diffraction to study the morphology , and focus on its antioxidant properties and oxidation mechanisms conducted in-depth analysis and research , ( Ti , Al ) N coatings applied to the compressor blade protection a certain theoretical reserves and technical support . Repeated testing to determine optimal process parameters, prepared from the inside out sequentially as Ti , TiN , T0.75Al0.25N T0.6Al0.4N , and T0.5Al0.5N layer coating , the coating thickness is uniform , with gradient nanostructures. Smooth and dense surface of the coating and the substrate with good performance . The transition layer between matrix T0.5Al0.5N layer design effectively improve the binding force between the coating and the substrate . High - temperature oxidation test data show that after oxidation by 750 ° C for 200 hours , ( Ti , Al ) N coating thickness no significant changes in the surface of the coating generates a dense layer of Al2O3 - based accompanied by a a TiO2 protective oxide film , the oxide film uniform and compact , cracking and spalling phenomenon does not appear . Oxidation kinetics curves correspond to the oxidation kinetics parabolic law coating antioxidant levels antioxidant levels . As a comparison , 1Cr11Ni2W2MoV stainless generated by an oxide film composed of Cr2O3 and Fe2O3 , in the 50 hours when the oxide , the oxide film peeling significant . The oxidation kinetics curves in accordance with the parabolic law of oxidation kinetics , antioxidant levels of antioxidant levels . Coating preparation process generated droplet has little effect on the oxidation resistance of the coating . The results show that the ( Ti , Al ) N coatings through 200 hours of high temperature oxidation at 750 ℃ ??still has a good overall performance, able to meet the needs of the actual engineering of the compressor blades .

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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 > Metal complex layer of protection
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