Effect Of Nanometer ZnO And Ag/ZnO Nanocomposite Powder On The Sintering Temperature Reduction And Performance Of Ceramic

Nanometer ZnO has strong sintering activity and light catalytic activity, and theZn2+, Ag+ions have excellent antibacterial activity, and Zn2+can make Ag existing asion to keep it having high antibacterial activity and resisting the color change, that ishelpful for the application in ceramics. the nanometer ZnO in ceramic billet body andAg/ZnO nanocomposite powder in glaze materials for sintering temperature reductionand the performances impact were study in the paper.The nanometer ZnO could promote the ceramic billet sintering significantly,when the sintering temperature was above550℃. The weight loss became more andthe densification rate was higher with the adding amount increase. When the addingamounts were0%、1%、3%and5%separately, the absorption peaks of melting athigh temperature stage of ceramics sintering appeared separately at1153℃,1137℃,1135℃and1049℃. The nanometer ZnO could significantly reduce the molten anddecomposition temperature of feldspar in the ceramic billet, and promote the sinteringand melting process of argil effectively.Nanometer ZnO had significant influences on the property of ceramic billets.Under the same sintering temperature, the line shrinkage rate and sintered densityincreased and the bibulous rate reduced gradually with the adding amount increased.Nanometer ZnO could reduce the transformation temperature of potash feldspar andquartz, and promote the generation of zinc spinel at lower temperature, that wasbeneficial for sintering temperature reduction.When the adding amount was5%, thenanometer ZnO could reduce the sintering temperature abount90℃and reduce thebillets sintering decalescence13.75%.The Ag/ZnO nanocomposite powder could reduce the lost weight of glaze,decrease the melting temperature obviously and widen the sintering temperaturerange. When the adding amount was5%, it could reduce sintering and moltentemperature about85℃and widen the sintering temperature range17℃, that ishelpful for the homogenization of glaze.The adding of Ag/ZnO nanocomposite powder in the glaze could improve theglaze hardness, whiteness, galze crack resistance and be helpful for reducing sintering temperature and shortening heat-preservation time.When the adding amount was5%,the sintering temperature was1150℃, and the heat-preservation time was10min,the glaze ceramic could get perfect sintering effect and antibacterial activity andsince-clean activity. The antibacterial rate was88.4%for the escherichia coli with theconcentration of9.54×109cfu/mL and98.6%for4.38×108cfu/mL. The degradationefficiency was22.3%to the methyl orange solution (21.0mg/L) and44.5%tomethylene blue solution (8.85mg/L). Compared with the ordinary ZnO, the Ag/ZnOnanocomposite powder could improve the performance of the glaze moresignificantly, because of its silver doping and nanometer size. The Ag/ZnOnanocomposite powder could effectively avoid the pinhole defect of glaze, and madethe bubble less and smaller in the glaze layer that promoted the glaze more smooth.When the adding amount was5%, the Ag/ZnO nanocomposite powder could reducethe glaze melting decalescence50.28%.The research could realize energy conservation and production emissionreduction in ceramic industry. Every tons glaze ceramics could save139kg standardfuel and reduce the pollutant cost about356yuan. And the glaze ceramic withantibacterial and since-clean function could reduce the organic reagent consumption,that was benefit for the environment protection.