Particle size of cerium oxide in rare earth polishing powder: The larger the particle size of cerium oxide, the greater the grinding force and the more suitable it is for harder materials. ZF glass should use finer polishing powder. It should be noted that all cerium oxide particles have a distribution problem, where the average particle size or median diameter D50 only determines the polishing speed, while the maximum particle size Dmax determines the polishing accuracy. Therefore, in order to achieve high precision requirements for rare earth polishing powder, it is necessary to control the maximum particle size of the polishing powder.

Basic requirements for polishing powder

(1) The particle size of the micro powder is uniform and consistent, within the allowable range;

(2) Has high purity and does not contain mechanical impurities;

(3) Has good dispersibility and adsorption properties to ensure uniform and efficient processing, and LBD-1 dispersant can be added appropriately to improve suspension rate;

(4) Powder particles have a certain lattice morphology, which forms sharp corners when broken to improve polishing efficiency;

(5) Has suitable hardness and density, and has good wetting and suspending properties with water, as polishing powder needs to be mixed with water

Hardness of polishing powder:

The true hardness of polishing powder is related to the material, for example, the hardness of cerium oxide is around 7 on the Mohs scale, and various cerium oxides are similar. But different cerium oxide materials give people a different feeling of hardness. Rare earth polishing powder is because cerium oxide polishing powder is usually agglomerated. The attached electron microscope photo shows a agglomerated polishing powder. Due to different firing temperatures, the strength of aggregates also varies, resulting in a different feeling of hardness when used. Of course, adding harder materials such as alumina to some polishing powders can improve their grinding rate and wear resistance.

The application of polishing powder: Polishing powder has excellent chemical and physical properties, so it has been widely used in industrial product polishing, such as polishing various optical glass devices, television picture tubes, optical eyeglass lenses, oscilloscopes, flat glass, semiconductor chips, and metal precision products.

Function of polishing powder: Polishing powder has the advantages of fast polishing speed, high smoothness, and long service life. Compared with traditional polishing powder - iron red powder, it does not pollute the environment and is easy to remove from adhered objects. Polishing the lens with cerium oxide polishing powder takes one minute to complete the task, while using iron oxide polishing powder takes 30-60 minutes. Therefore, rare earth polishing powder has the advantages of low dosage, fast polishing speed, and high polishing efficiency. And it can also change the polishing quality and operating environment. Generally, rare earth glass polishing powder is mainly made of cerium rich oxide. Cerium oxide is an extremely effective polishing compound because it can polish glass in both chemical decomposition and mechanical friction forms simultaneously. Rare earth cerium polishing powder is widely used for polishing cameras, camera lenses, TV picture tubes, eyeglass lenses, etc.