1, polished material
Polishing powder is usually composed of cerium oxide, alumina, silicon oxide, iron oxide, zirconia, chromium oxide and other components. The hardness of different materials is different, and the chemical properties in water are also different, so the occasion of application is different. The moson hardness of alumina and chromium oxide is 9, cerium oxide and zirconia are 7, and the iron oxide is lower. The chemical activity of cerium oxide and silicate glass is higher and the hardness is equal, so it is widely used in glass polishing.
In order to increase the polishing rate of cerium oxide, fluorine is usually added to the cerium oxide polishing powder to increase the grinding rate. The mixed rare earth polishing powder with lower cerium content usually contains 3-8 fluorine, and pure cerium oxide polishing powder usually does not contain fluorine.
For ZF or F series of glass, because of its small hardness and the high content of fluorine in the material itself, it is good to choose the polishing powder that does not contain fluorine.
2. Basic requirements
(1) the particle size of the micro powder is uniform and within the allowable range;
(2) high purity and no mechanical impurity;
(3) good dispersity and adsorbability are good to ensure the uniformity and efficiency of the process, and a proper amount of LBD-1 dispersant can be added to increase the suspension rate.
(4) powder particles have a certain lattice shape. When they are broken, sharp corners are formed to improve the polishing efficiency.
(5) suitable hardness and density, and good wettability and suspension property with water, because polishing powder needs mixing with water.
The granularity of cerium oxide
The larger the size of the cerium oxide, the greater the grinding force, the more suitable for the harder material, and the ZF glass should be finely polished. It should be noted that all the size distribution of CeO2 has a distribution problem. The average particle size or median diameter of D50 only determines the speed of polishing, and the maximum particle size Dmax determines the polishing accuracy. Therefore, in order to get high precision, the maximum particle of polished powder must be controlled.
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