Rare-earth polishing material with a core shell structure and preparation method thereof

Abstract

The invention provides a polishing material with a nuclear shell structure and a preparation method thereof. The rare-earth polishing material is powder granules, the inner core of the rare-earth polishing material is an inorganic compound taking rare-earth oxide as a main body, and the shell is an inorganic compound containing the rare-earth oxide or / and fluoride. The polishing material comprises the following components according to the weight percentage: 50-99 of rare earth, 0.9-50 of other components and less than 0.1 of unavoidable impurities. The rare-earth polishing material has mean granule size of 0.1um-2.0um, the specific surface area after calcination at 900 DEG C of less than 15m / g, and the dispersity of less than 1.5. The obtained rare-earth polishing material has a positive cooperative function in the polishing process, a greater cutting function on a material with high hardness, an elastic buffer function on a material with lower hardness and higher cutting capability and does not generate scratches. The preparation method of the rare-earth polishing material is simple and is easy to realize industrialization.

Description

technical field [0001] The invention relates to a rare earth polishing material with a core-shell structure and a preparation method thereof, and belongs to the technical field of chemical preparation of rare earth powder materials. Background technique [0002] Since 1940, rare earth polishing powder began to replace iron oxide for glass polishing, and became one of the key process materials in the glass polishing process. Compared with traditional polishing powder, rare earth polishing powder has the advantages of fast polishing speed, high finish and long service life, and can change the polishing quality and operating environment. The two important performance parameters in the polishing process, the polishing speed and the quality of the polished surface (ie roughness), are related to the structure (single crystal, polycrystalline) and morphology (size, distribution and shape) of the polishing powder. Researchers have continuously developed various polishing powders, s...

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Problems solved by technology

For example, U.S. Patent 5543216 discloses a preparation method for synthesizing cerium oxide particles. This method adjusts the pH value of the reactant to 8-9, and raises the temperature to 100-200°C under pressure. The particle size obtained is between 0.03-5um , the method is more complicated, the equipment is expensive, the particle size distribution is wide, and the polishing effect is not good

Chinese patent CN1821314 discloses a preparation method of ultrafine cerium oxide. After adding a surfactant to a cerium salt solution, the solution is first contacted with an alkaline substance to control the pH value of the reaction to generate a precipitate, and then the suspension is treated with oxalic acid Transform, control the pH value at the end of the reaction, finally filter, wash, and dry the precipitate, and the superfine cerium oxide obtained after burning can be used for polishing, but the preparation steps in this method are also relatively complicated, and the particle size distribution of the prepared product is also relatively The width is between 10nm and 30um, and the specific surface area reaches 50m 2 / g, it has poor reusability as a polishing powder

[0003] During the use of polishing powder, there are the following problems: the dispersion stability of the particles, due to the interaction force between the particles, the dispersed particles will inevitably aggregate to varying degrees during the storage process, resulting in large particles , resulting in polishing scratches

This kind of metal oxide or its mixture is used as polishing powder, which has poor wear resistance and is easy to break, and the irregular shape after breaking is easy to scratch the polishing surface