Since 1940, high cerium oxide content of rare earth polishing powder began to replace iron oxide (i.e., red iron oxide) used for polishing glass, become the key technology in the process of glass polishing powder glass polishing processing one of the material. Compared with traditional polishing powder - iron red 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. For example, cerium polishing powder polishing lens, one minute completed work, such as the use of iron oxide polishing powder 30~60 minutes. Rare earth polishing powder because of its unique chemical mechanical action principle of high polishing efficiency, be the first choice of the glass polishing materials, is widely used in lens, optical element (lens, prism), color glass shell, flat-panel display panels electronic glass, silicon, glass substrate products such as polishing disk.
According to the content of cerium, rare earth polishing powder can be divided into high cerium (>90%), rich cerium (>70%) and low cerium (<70%). According to different application fields, the polishing powder products of rare earth catalytic materials can be divided into three categories: micron, submicron and nano.
The performance evaluation index particle size of the polishing powder determines the polishing accuracy and speed, and is characterized by the number of items and the average particle size. The mesh size reflects the size of the largest particle size, and the average particle size determines the overall level of the particle size of the polishing powder.
Hardness: the hardness of large particles has a fast cutting rate, and the addition of grinding aid can also improve the cutting rate.
Suspended: high-speed polishing polishing powder has good suspended, has a great influence on the shape and size of suspended particles, flake of polishing powder and small particles of polishing powder is suspended. Suspension can also be achieved by adding suspension.
Particle structure: particle structure is the agglomerate particle or single crystal particle determines the wear resistance and fluidity of the polishing powder. The aggregates particles can be broken in the polishing process, which leads to wear resistance, and the monocrystalline particles have good wear resistance and fluidity.
Color: related to the praseodymium content and temperature in raw materials, the higher the praseodymium content, the more red the polishing powder. Low cerium polishing powder contains a lot of praseodymium, so it is red-brown. For pure cerium oxide polishing powder, the roasting temperature is high, the color of polishing powder is white and red, the temperature is low, and the color is yellow.
Global production of rare earth polishing powder amount is about 20000 tons, among them, the output optical accessories company minimum, under 2000 tons, the largest abrasives industry, around 7000 tons, 5000 tons of rare earth industry and chemical industry production. The production and consumption of rare earth polishing powder in our country are equal to that of the application amount, producing about 10,000 tons per year, of which 8,000 tons are used domestically and 2,000 tons are exported.
Related Industry Knowledge
- Preparation technology of rare earth nanomaterials
- Introduction to rare earth elements and nanomat...
- Preparation of nanomaterials
- The spatial and temporal distribution and metal...
- The types of rare earth deposits in China
- What is heavy rare earth?
- Material metallurgy progress
- Basic knowledge of radioactivity in rare earth ...
- Overview of precious metal high speed electroch...
- Application of rare earth in coating industry