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Ceramic Coatings on Stainless Steel Prepared by Chemical Method

Author: MaHui
Tutor: WuDeZhen
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: sol-gel slurry method mullite ceramic coatings stainless steel
CLC: TG174.453
Type: Master's thesis
Year: 2010
Downloads: 129
Quote: 1
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Abstract


Ceramic coationgs on stainless steel can possess good insulation property and prevent corrosion. In this study, sol-gel and slurry were be used to prepare ceramic coatings on stainless steel. The mullite coatings were prepared on stainless steel surface by sol-gel and dip-coating methods using Al(NO3)3·9H2O and TEOS as raw material and B2O3 as an additive. The influences of sol concentration, heating time, heating rate, sintering temperature on quality of the mullite coatings were studied. The composition of mullite, heat treatment process, and morphology of coatings were investigated and analyzed by means of FI-IR, TG-DSC, and stereoscopic microscope, respectively. The results show that flawless coats can be obtained with the sol concentration between 0.094×10-3mol/ml and 0.117×10-3mol/ml by heating for 7 hours at the rate of 3℃/min. Results of the thermal shock resistance test and oxidation resistance test demonstrate that coatings sintered at 950℃possess the fairly high adhesive strength with stainless steel.Ceramic coaings were prepared on stainless steel by slurry method. The influences of content of slurry solution, adhesives, sintering temperature, composition of powders were discussed in paper. The coatings were analyzed by means of XRD, SEM. The results show that the bonding of coatings and substrates are well-adhered. Coatings were improved by using water glass as adhesive by adding 1% ZnO. The fluidity of alumina and mullite powders was improved by adding sodium dodecyl sulfate as dispersant. When the content of dispersant was 15%, as apparent density of alumina powder was lower, the fluidity of alumina powder was highly improved. When the content of dispersant was 10%, as apparent density of mullite powder was lower, the fluidity of mullite powder was highly improved.

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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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