Why white corundum is called precision casting sand
White corundum is obtained from industrial alumina powder as raw material, after high-temperature smelting, after processing through various processing procedures, and then through sieving to obtain white corundum for particle size division, forming the white corundum that we see with the naked eye Micro powder, fine powder, sand and so on.
The sieved white corundum can be used for grinding and polishing, can be used for the production of fixed abrasive tools, can be used as a refractory material, can also be used as a food additive, of course, can also be used for precision casting, white corundum sometimes even Will be called precision casting sand.
Why use white corundum for precision casting sand? Mainly because white corundum has the following advantages in casting:
1. The shell type made by white corundum has stable thermochemical properties, high fluidity, and will not cause layering problems;
2, white corundum has high strength, low gas evolution, low expansion coefficient, and will not expand and crack under high temperature conditions;
3. The white corundum sand itself is resistant to high temperature, and its casting not only has good mold release, but also has good anti-sticking sand performance, and the shell layer will not peel off and the speed of solidification is also very fast.
4. Casting with white corundum has good dispersion, and the surface of the casting can meet the requirements in terms of smoothness and flatness;
The application of white corundum in precision casting is still very wide. It is a commonly used investment casting shell material such as alloy castings, core sand, coatings, etc. It can even replace the existence of zircon sand to a certain extent.