White corundum is made of industrial alumina powder, which is obtained after high-temperature smelting and various processing procedures, and then the white corundum obtained is divided into particle sizes through sieving, and the white corundum is formed from industrial alumina powder
. As a raw material, it is obtained after high-temperature smelting and various processing procedures, and then the white corundum obtained by sieving is divided into particle sizes to form the white corundum micropowder, fine powder, segmented sand, etc. that we see with the naked eye. wait.
According to the size of the sieved white corundum, it can be used for grinding and polishing, the production of consolidated abrasive tools, refractory materials, food additives, and of course precision casting. White corundum is sometimes even It will be called special sand for precision casting.
Why use white corundum for precision casting sand? The main reason is that white corundum has the following advantages in casting:
1. The shell mold made of white corundum has stable thermochemical properties, high fluidity, and will not There is a problem of layering;
2. White corundum has high strength, low gas generation, low expansion coefficient, and will not expand and crack under high temperature conditions;
3. White corundum sand itself is resistant to high temperature, and casting with it not only has good mold release performance, but also resists sticking sand The performance is also very good, and the shell will not peel off, and the curing speed is also very fast.
4. Casting with white corundum has good dispersibility, and the surface of the casting can meet the requirements in terms of smoothness and flatness;
white corundum is still widely used in precision casting, and is commonly used in alloy castings, core surface sand, coatings, etc. The investment casting shell material can even replace the existence of zircon sand to a certain extent.