What Role Does Brown Corundum Abrasive Play in Polishing Sand?

Why should we forge?
Brown corundum abrasive is made of high-quality brown corundum as raw material and refined by modern new technology. It has the advantages of short grinding time, high efficiency, good efficiency and low price. So what role does brown corundum abrasive play in polishing sand?
Brown corundum abrasive is mainly used for decontamination of stainless steel surface, removal of welding slag and matt effect, removal of rust, dirt and oxide scale on iron workpiece, increase of adhesion of coating and coating, removal of oxide scale on aluminum workpiece, surface strengthening and polishing, removal of matt effect on copper workpiece, sanding and engraving image on glass products, matt effect on plastic products (hardwood products), denim and other special fabrics Plush processing and effect image.
The grade of brown corundum abrasive can be divided into primary sand, secondary sand and tertiary sand according to the alumina content. Brown corundum abrasive is made of bauxite, iron filings and carbon after high temperature tempering. Therefore, the abrasive contains impurities such as iron oxide, silicon oxide and titanium oxide, so it can be said that the high content of alumina determines the quality of brown corundum abrasive.
Benefits of brown corundum abrasive polishing sand:
1. Brown corundum abrasive has strong grinding ability, good wear resistance, high durability, easy control of processing scale, and high degree of processing automation.
2. The grinding force is small, the grinding temperature is low, the surface quality is good, and there are no burns, cracks and structural changes. When grinding cemented carbide with diamond wheel, the grinding force of brown corundum abrasive is only one-fourth to one-fifth of that of green silicon carbide wheel.
3. Brown corundum abrasive has high grinding efficiency. When machining hard alloy and non-metallic hard and brittle materials, the metal removal rate of diamond grinding wheel is better than that of cubic boron nitride grinding wheel.
4. The processing cost of brown corundum abrasive is low. Diamond grinding wheel and cubic boron nitride grinding wheel are relatively expensive, but the total cost is low due to their long service life and high processing efficiency.
Calcination is a common treatment method for brown corundum abrasive. The process is to calcine the abrasive at 800~1200 for 2~4 hours, and then naturally cool it to turn the color of the abrasive into blue-black. Because calcination treatment can significantly improve the durability and hardness of abrasive, some industrialized countries generally use calcined abrasive to manufacture coated abrasive and resin abrasive.
The mechanism of durability and hardness of burning brown corundum abrasive is that burning reduces the residual stress in the broken abrasive; A small amount of liquid phase in the combustion process bridges the small defects in the abrasive lattice and the microcracks formed during the fracture process; The organic pollutants such as grease and dust on the abrasive surface carbonize, differentiate and oxidize during the combustion process, and eventually volatilize into carbon dioxide gas, thus promoting the hydrophilicity of the abrasive; During the combustion process, the originally wrapped magnetic material is exposed to the surface with the fracture of abrasive particles, which promotes the magnetic separation effect after combustion. The brown corundum on the colored surface indicates that it has been fully calcined to increase its resistance.
In the brown corundum abrasive market, you will see brown corundum in brown, red, brown red, etc. These are determined by the content of alumina. You can even see black and brown corundum. So the price of brown corundum varies with the content and color of alumina. Brown corundum itself combines the excellent functions of various materials, has stable chemical properties, and can resist corrosion to a certain extent. It naturally becomes an indispensable material in industry. It is also a kind of artificial corundum. At present, the price of shopping malls is relatively stable. Because of the different particle sizes, there are different price differences. The grain size determines the price and quality effect of brown corundum. Good brown corundum abrasive is of high quality.