Basic requirements for polishing powder of the hot

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Basic requirements for polishing powder of precision optical glass

high precision optical glass is often used to make invisible radar probe lens, reconnaissance satellite camera lens, high-speed aircraft window and ultra precision parts such as optical lens and prism in laser emission device. With the application of various types of high-precision optical glass, the requirements for polishing powder in optical glass polishing are also very high, The following summarizes the basic requirements of the lower optical glass polishing powder

(1) the particle size of the fine powder will reach 93.3 million tons by 2020, which is within the allowable range

(2) it has high purity and does not contain other mechanical impurities

(3) it has very good dispersibility to ensure high efficiency and uniformity in the processing process. Dispersants can be added appropriately to improve the suspension rate

(4) micro powder particles need to have a certain lattice shape, and form sharp edges and corners when broken, so as to improve the polishing efficiency

(5) have appropriate density and hardness, and have good wettability and suspension with water. Polishing powder needs to be mixed with water.

the larger the particle size of polishing powder, the greater the grinding force, and the more suitable for hard materials. It should be noted that there is a distribution problem in the particle size of all polishing powders. The size of average particle size or median diameter D50 only determines the speed of polishing, while the maximum particle size Dmax determines the level of polishing accuracy. Therefore, in order to obtain high accuracy requirements, it is necessary to control the sweeping method: adjust the maximum particles of pulley polishing powder

the real hardness of polishing powder is related to the material. For example, the hardness of aluminum oxide type is about Mohs hardness 9, and all kinds of alumina are similar. But different alumina gives people different hardness. Due to different firing temperatures, the strength of aggregates is also different, so the hardness will be different when used, and the grinding rate and wear resistance of products will be different. This requires experienced production plants to control according to different substances thrown. The third kind of slurry concentration in the polishing process is mainly used in general experimental machines, which determines the polishing speed. The higher the concentration, the higher the polishing speed. When using small particle polishing powder, the slurry concentration should be appropriately reduced to obtain the appropriate fluidity. It is generally recommended to be% on it

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