Why use white fused alumina for precision casting sand? Mainly because white fused alumina has the following advantages in casting:
1. The shell type made by white fused alumina has stable thermochemical properties, high fluidity, and no layering problem;
2. white fused alumina has high strength, low gas generation, low expansion coefficient, and will not expand and crack under high temperature conditions;
3. white fused alumina sand itself is resistant to high temperature, and its casting not only has good demoulding properties, but also has good anti-sticking properties, and the shell will not peel off, and the curing speed is also very fast.
4. Casting with white fused alumina has good dispersibility, and the surface of the casting can meet the requirements in terms of smoothness and flatness;
white fused alumina is still widely used in precision casting. It is a commonly used investment casting shell material such as alloy castings, core surface sand, and coatings. To a certain extent, it can even replace the existence of zircon sand.