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Research on Microstructure and High-temperature Oxidation Property of Al-Si Coatings on 1Cr11MoNiW1VNbN Stainless Steel

Author: QuWenJuan
Tutor: YangShiWei
School: Harbin Engineering University
Course: Materials Science
Keywords: 1Cr11MoNiW1VNbN stainless steel Al-Si coating High temperature oxidation resistance
CLC: TG174.44
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


To meet the ultra-supercritical steam turbine blade demand conditions, this paper slurry prepared on the surface of stainless steel in 1Cr11MoNiW1VNbN Al-Si coating. According to GB/T13303-91 \developed a high-temperature oxidation tests: temperature 700 ℃, holding time of isothermal oxidation test 1000h; temperature of 700 ℃, 11 thermal cycles of cyclic oxidation tests. Using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) analysis and detection methods such as Al-Si coating on the surface morphology, composition, structure and coating cracking and spalling of the causes of the analysis and research. Preparation of Al-Si coating into the outer layer, the intermetallic compound layer and buffer layer. Al-rich outer layer thickness of about 8μm, the main component of a-Al and a few FeAl3 phase; metallic compound layer thickness of about 16μm, the main component of Fe2A15 phase; transition layer is about 14μm, due to proximity to a matrix organization -Fe and Fe3A1 facies. Metal compound layer is resistant to high temperature oxidation of effective protection layer that dense, uniform thickness, and the substrate binding interface is flat and combine well. The results showed that, Al-Si coating 700 ℃ isothermal oxidation 1000h surface density, continuous a-A1203 protective oxide film. Initial oxidation generates PBR gt; 1 cause of FeAl2O4 and FeO oxide film generated compressive stress, the oxide film from the late stages of θ-Al2O3 to α-Al2O3 transition tensile stress generated, as well as the holes in the coating will cause the surface oxide film cracking and peeling. However, the coating with the FeAl3, Fe2A15 opposite FeAl phase transition, the surface can provide sufficient elements to continue to form an Al oxide film Al2O3 coating has a good self-healing capabilities. Of Si element in the coating can effectively control the growth of brittle phase Fe2Al5 improve plasticity Al2O3 oxide film, opposite to promote β γ 'phase transition, reducing the aluminized coating ductility brittle transition temperature, enhance the adsorption capacity of the diffusion layer; Si and alloys elements generated second phase can effectively hinder coating and the substrate interdiffusion of elements to improve the high temperature oxidation resistance coating. Based GB/T13303-91 and HB5258-2000 standard Al-Si coated and uncoated specimens oxidation performance evaluation: uncoated specimens as antioxidant level, Al-Si coating is completely anti-oxidant levels. Comparative analysis of isothermal oxidation kinetics and cyclic oxidation kinetics, Al-Si coating oxidation resistance superior to uncoated specimens.

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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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