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以高硬度的钇稳定氧化锆球为研磨介质,对内衬聚氨酯的搅拌磨制备高纯超细SiO2微粉的可行性进行了研究,并研究了SiO_3微粉粒径特征参数D_(50)随搅拌粉磨时间延长的变化规律,考察了钇稳定氧化锆球对SiO_3微粉的污染程度,探讨了1μm以下SiO_2微粉的形貌特征。结果表明:用该搅拌磨磨细石英粉并经过沉降分级,可获得SiO_2含量为99.91%、粒径为1μm以下的高纯超细SiO_2微粉,不经分级可以获得SiO_2含量为99.99%、粒径为61.5μm以下的SiO_2微粉,但难以获得球形SiO_2微粉;钇稳定氧化锆球对SiO_2微粉的污染程度小,磨损带进的ZrO_2杂质仅含0.0246%,带进的Y_2O_3杂质为0.0014%。
The feasibility of preparing high-purity ultra-fine SiO2 micropowder by stirring milling lined with polyurethane was studied by using yttrium-stabilized zirconia balls with high hardness as milling media. The effects of grinding time The change rules of the powders were investigated. The contamination degree of SiO_3 powders with yttrium-stabilized zirconia balls was investigated. The morphological characteristics of SiO_2 powders below 1μm were investigated. The results show that the fine silica powder can be obtained by grinding the fine quartz powder and settling classification, the high purity ultrafine SiO 2 powder with the SiO 2 content of 99.91% and the particle size of 1μm can be obtained. Without classification, the SiO 2 content is 99.99% and the particle size is 61.5 μm, but it is difficult to obtain spherical SiO_2 powders. The yttrium stabilized zirconia balls pollute the SiO_2 fine powders little, the content of ZrO_2 is only 0.0246% and the content of Y_2O_3 is 0.0014%.