| In this paper,the research situation of metal-based ceramic composite coating and the research status of slurry method are briefly reviewed,and the advantages of using slurry method to prepare ceramic composite coating compared with other methods are introduced,as well as some achievements made by scholars at home and abroad.In this paper,the composite coating of steel based ceramics is prepared by slurry method,and the ratio of ceramic coating is investigated by different curing processes by means of the combination of changing dosage and orthogonal analysis,and the microscopic morphology of ceramic composite coating is observed and analyzed by scanning electron microscope?SEM?and X-ray Diffractometer?XRD?respectively.Explore the combination of the coating and the substrate.Through experiments,the factors affecting the wear resistance,bonding strength,thermal shock resistance and corrosion resistance of ceramic composite coatings are investigated,which provides a theoretical basis for the performance analysis of ceramic composite coatings.The composition of steel-based ceramic coating prepared by slurry method includes:Silica,alumina,chromium trioxide,two aluminum phosphate,copper oxide and magnesium oxide.The proportional configuration of ceramic composite coating components was finally determined by experiments:mixed aggregate alumina 6g,silicon oxide?30%nm?4g,chromium trioxide 0.9g,curing agent copper 2.4g,auxiliary material magnesium oxide 1.5g,mixed aggregate and adhesive phosphoric acid two aluminium ratio of 1.8:1.Ceramic composite Coating Curing process:the prepared sample room temperature cool 24h,and then heat curing,curing is divided into two stages,the first stage is at the initial temperature 130?resistance furnace to 15?/min heating up to 400?,insulation time 3h,Mainly to remove the coating at room temperature after curing the remaining free water and part of the crystalline water;the second stage of high temperature curing,curing temperature of 600?,insulation time of 4h,the main purpose is to remove the residual crystalline water in the coating and promote chemical reactions within the coating.Through the observation of microscopic morphology and tissue composition analysis of ceramic composite coating,it is seen that the coating is not only improved by high temperature curing,but also the coating produces new substances such as Mg2SiO4,FeCr2O4 and AlPO4.Ceramic composite coating and Q235 matrix interface has mechanical action,chemical action and diffusion,which is conducive to improving the comprehensive performance of the coating,which added 30%nm aggregate coating comprehensive performance is better than micron coating.Through the performance test of ceramic composite coating,it is found that:wear resistance,the relative wear resistance of nano-coating and micron coating is 4.63 times times and twice times that of steel matrix respectively,in which the average wear weightlessness of nano-coating is 3.9g/m2;combined with strength,The shear strength of nano-coating and micron coating and matrix are 4.13MPa and 3.56MPa respectively,the shear strength of nano-coating and micron coating are 0.94MPa and 0.51MPa respectively,and the anti-thermal shock of nano-coating in 600?is up to 24 times,The maximum number of anti-thermal shock experiments for Micron Coatings was 15.With the increase of thermal shock temperature,the number of thermal shock resistance of the coating decreases gradually,when the temperature of the thermal shock test reaches 900?,the number of anti-thermal earthquakes of micron coating is 2 times,the number of anti-thermal earthquakes of nano-coating is 6 times,corrosion resistance,nano-coating acid corrosion,Alkali-resistant corrosion and salt-resistant corrosion were increased by 18.4 times times and 1.88 times times,2.14 times times and 1.97 times times,31.5 times times and 2.14 times times compared to Matrix and micron coatings,respectively. |
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