What effect does the material used have on investment casting?

(1) Metal materials.

Metal materials are mainly from purchased materials, scrap castings and pouring outlets. Since the purchased materials are generally in bulk and can be easily mixed with other materials, they are generally not selected. In addition, the purchased materials should be analyzed for their chemical composition in order to evaluate the materials.

(2)Mold material

Its performance indicators include: melting temperature and solidification temperature range, heat resistance, thermal expansion and shrinkage rates, strength, hardness, viscosity, fluidity, coating and ash content. This performance indicator is difficult to test one by one, but its important indicator is shrinkage The rate must be tested because it affects the dimensional accuracy of the casting and the quality of the shell.

(3) Silica sol.

The main parameters are: SiO2 content, density, Na2O content, PH value, kinematic viscosity and colloidal particle diameter, which will affect the shell strength and coating, so they are also very important and cannot be ignored.