Research On Preparation And Performance Of CeO₂-SiO₂Composite Polishing Powder

The precursor of CeO2-SiO2composite polishing powder was obtained by the spray-dryingprocess with cerium carbonate as cerium resource and silicon soliquid as silicon resource, thenthe CeO2-SiO2composite polishing powder was obtained by calcining. The X-ray diffraction,scanning electron microscope, laser particle sizer, zeta potential analyzer were used tocharacterize the effect of different silicon-doping content, calcination temperature, holding time,different fluorine-doping content on performance of composite polishing powder. We can drawthe following conclusions:The polishing effect of CeO2-SiO2composite polishing powder is significantly greater thanCeO2and SiO2polishing powder due to the polished synergy function between CeO2and SiO2.The SiO2within composite polishing powder can completely coated by CeO2when mass ratioof cerium oxide to silicon oxide higher than2:1, and surface morphology is close to spherical.By comprehensive consideration of particle size, the burnishing mass and the surfacesmoothness of glass after polishing, we can draw a conclusion: when mass ratio of cerium oxideto silicon oxide approaches in4:1, the powder particle size is0.985μm, the sample prepared wasmade the polishing experiments on K9glass, the testing and analysis results show theburnishing mass of polishing powder is0.2960g, the superficial scratches are few, and thepolishing effect of composite polishing powder achieves the best. The prepared precursorparticle size is smallest when the air flow of spray drier is700L/h. With the increase ofcalcination temperature, composite polishing powder particle size decrease firstly and thenincrease at different temperatures and the agglomeration of polishing powder is also becomingmore and more serious, the particle of polishing powder is smallest and the dispersity is betterwhen the calcination temperature is600degrees centigrade. With the increase of the holdingtime after polishing powder precursor calcined at600C, the composite polishing powderparticle size decrease firstly and then increase, the dispersion of the polishing powder are allbetter, the morphology mostly are spherical. The polishing powder particle is smallest when the holding time is4h. The various sample prepared was made the polishing experiments on K9glass, the testing and analysis results show the polishing powder particle size is smallest whenthe air flow of spray drier is700L/h, calcining temperature is600℃and the holding time is4h.The burning mass is biggest. the burning mass is0.2378g polished2h, and the surfaceroughness of glass is lowest, the surface roughness within259μm257μm area of glass is0.049μm. When the hydrofluoric acid was added to the raw material solution, the polishingeffect of polishing powder is obviously improved, this is because generating CeF3in polishingpowder. CeF3belongs to the trigonal system with the sharp edges and corners, and this structurewill be helpful to polish. The crystalline grain is refined and the hardness of polishing powder iscreasing due to the existence of CeF3. The burning mass is biggest when the content of fluorine-doping is8%. The burning mass is0.3074g polished2h, and the surface roughness of glass islowest, thesurfaceroughness within259μm257μmarea of glassis0.047μm.