Research On Wettability Of Ag-SnO₂Doped With Oxides

With the development of nanotechnology, tin oxide has excellent performance in optical, electrical, catalyst, gas sensor, pressure sensor, thermal and humidity sensor fields, it received great attention and extensive research. Mastering the controllable synthesis of tin oxide material can purposefully regulate its various properties parameters, and finally realize the practical application.Experiment with stannous chloride, stannous sulfate as the main source of tin, tin dioxide powder prepared by liquid chemical method and research on the Ag-oxide doped SnO2wettability.Morphology, particle size and size distribution of tin dioxide powder were studied. By scanning electron microscope (SEM), X-ray diffraction (XRD), and other testing means, it’s tested and studied the properties of tin dioxide powder, oxide doped effects on Ag-SnO2wettability.This paper studied the influence law of the morphology and particle size of the tin oxide powders calcined with the different reaction system, the different mixing method, the different concentration of reactants and other process parameters by tin oxide powders prepared by liquid chemical method. Ag-SnO2doped oxide is made by coprecipitation preparation of tin oxide powder doped, which controlling the doping content, kinds and studying the distribution of each element and material wetting performance. Then adopts coprecipitation preparation of doped tin oxide powders, by controlling the doping content and kinds, it’s studied the wettability of Ag-SnO2doped oxide.Tin dioxide powder prepared by stannous chloride hydrolysis, it shows the irregular granular morphology and reunion phenomenon is obvious. There is a certain relationship between the particle size of tin dioxide powder and the pH value. When pH<8.5, the powder particle size increases with the increase of pH value, and tend to be proportional increase. When the pH>8.5, the powder particle size fell sharply with the increase of pH value, and when pH=8.5, powder particle size is the largest peak at275nm.SnO2powder prepared by the reaction of SnCl2and oxalic acid aqueous solution shows rod shape in the right way. By SnCl2and oxalic acid aqueous solution react,SnO2powder generally shows irregular sheet and flower shape in the opposite way. The reaction of SnCl2and oxalic acid alcohol solution is preparation of SnO2powder in right way, which shows irregular filamentary and flower structure.SnO2powders prepared by the reaction of SnCl2and oxalic acid alcohol solution shows irregular cumin flake and irregular flower shape. The four groups of powder show light reunion phenomenon, not even.To enlarge group analysis, the enlarged group uses stannous chloride and oxalic acid(1:2) as a benchmark ratio to amplify. Experimental results can be seen, the tin dioxide are irregular shape, powder particle size is less than15μm, and no phenomenon of reunion.But no one shows like the powder morphology of1times.Adopts coprecipitation preparation of SnO2doping oxide, research on the impact of mixed oxides on wettability of Ag-SnO2experiment, when Ag-SnO2without oxides has no wettability. When using Bi2O3as doping group, the Ag-SnO2wettability has no effect. To the experiment of Ag-SnO2electric contact material prepared by coprecipitation, when SnO2without anything, it has no wetting performance. So if the high voltage current contacts this kind of electric contact material, because of high temperature, electric contact material will splash and reduce the service life of the electrical contact. When using Bi2O3as doping group, Bi2O3has no effect on SnO2wet performance, but when using CuO as doping group, CuO has a great influence on wetting performance. When the doping CuO content is between1%and6%, wetting properties of SnO2increases with the increase of the content of CuO; When CuO content between7%and9%, wetting properties of SnO2and material containing5%,6%CuO are similar; When mixed with10%CuO, SnO2show good wetting properties;When mixed with11%CuO, SnO2show the best wetting properties,silver completely immerses ceramic films, it is the ideal material; But when doped with12%of CuO, wetting performance is poor. So, when doping CuO content reached11%, Ag-SnO2wetting performance has reached the peak, the most ideal.The research results show that the preparation method of five kinds of reaction system can make the tin dioxide powder with different size and various morphology, which is granular, rod, flake, filamentary, flowers and irregular shape, and powder size range from the nanoscale to micron level. The wettability of Ag-SnO2doped with11%CuO is the best technology.