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Fabrication and Characteristic of Ceramic Coatings on Stainless Steel Substrates

Author: LiuJian
Tutor: LiYouFen
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Sol - gel method . Slurry Process Stainless steel substrate Ceramic coating High temperature oxidation resistance Thermal shock
CLC: TG174.453
Type: Master's thesis
Year: 2011
Downloads: 115
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Abstract


With the development of modern state-of-the-art requirements metallic materials with high temperature resistance, corrosion resistance, abrasion resistance and anti-flame erosion performance, traditional metallic materials can not meet the requirements. Is an effective way to improve the performance of metal materials by surface coating technology, countries around the world are trying to study and application of various coating processing technology to improve the surface properties of the technology, processes and the corresponding. Which was prepared in a metal surface of ceramic coatings to become a research hotspot. The topics studied 1Cr18Ni9 stainless steel, the sol - gel method and slurry method in surface preparation of ceramic coating to improve the stainless steel high temperature oxidation resistance and thermal shock resistance. Sol - gel prepared mullite ceramic coating study flux B203 and calcination temperature on the morphology of the coating. The use of XRD, TG-DTA and SEM / EDS analysis of the coating phase composition and microstructure, and microhardness of the coating and high temperature oxidation resistance were measured and evaluated. The study showed that: when the B203 with mullite quality, than the 0.5, and the sintering temperature of 850 ° C, the resulting coating structure is dense, uniform hardness of about 5 times the matrix; the coating mainly generated Al2.35Si0.64O4.82, Al4B2O3 ceramic phase and some high expansion coefficient of the amorphous phase, and the matrix elements spread to the coating the generated Cr1.3Fe0.7O3 phase. The high-temperature oxidation test shows: coating mass of the sample weight and the oxidation time parabolic relationship with increasing oxidation temperature, the oxidation rate increases; maximum oxidation weight gain only at 850 ° C under oxidizing 30H 0.076mg/cm2 oxidation process activation energy E 573.12kJ · mol-1, the coating has excellent oxidation resistance and good high temperature stability; mullite coating thermal shock resistance to 800 ℃ 30, the coating and the substrate good bonding strength. To using slurry law silicon-based system, and magnesium-based system, and boron-based system of ceramic coatings were prepared in a stainless steel surface preparation process and a different system of slurry coating morphology, optical microscopy and XRD analysis the morphology of the coating structure and composition, using TG-DTA investigated the thermal chemical reaction process of the coating at different temperatures, the detection of the hardness, thermal shock resistance, high temperature oxidation resistance and other properties of the coating. studies show: Silicone based systems coating for the amorphous phase of an amorphous structure, while in the magnesium-based system in the coating forming a new phase CaMgSi2O6 Mg2Al4Si5O18 SiO2 content of 48 wt% of the silicon-based coating layer having a higher hardness, matrix hardness approximately 3 times; coating to withstand 700 ℃ thermal shock 17 times is still intact, no peeling, excellent thermal shock resistance; 700 ° C resistance to high temperature oxidation test, MgO content of 48 wt% magnesium coating oxidation resistance better oxidation after 16 h of weight gain of only 0.021 mg/cm2; boron coating flooding, oil immersion test the 9d (days), quality weight gain were 0.56 mg/cm2 and 0.88 mg/cm2 coating hydrophobic, oleophobic better performance; boron-based coating is immersed in the the 6wt% H2SO4 solution, and 10wt% NaCl solution to a corrosion test, the coatings were intact after 5d corrosion coating acid, salt corrosion.

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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 > Inorganic complex layer of protection > Ceramic stratified
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