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What is silica sol precision casting? Why can silica sol be used for precision casting?

Author:MikeSource:DongYing YiMing New Materials Co.,LtdLink:

Silica sol (colloidal silica), also known as silicic acid solution, is a colloidal dispersion of amorphous silica aggregate particles in water. Silica sol has a wide water loss temperature range, which will not only destroy its bonding strength , it will also make its three-dimensional structure more stable and produce higher bonding strength. Silica sol precision casting is a good inorganic binder.

In the 1960s, silica sol began to be used as a binder for precision casting. Since the 1990s, due to increased pressure for environmental protection, silica sol has gradually replaced the widely used ethyl silicate, which is highly polluting and expensive. Hydrolyzate, polymer-reinforced fast-drying silica sol is currently widely used as a binder in the world's investment casting industry.

Precision casting refers to the general term for the process of obtaining castings with precise dimensions. Precision casting is also called lost wax casting. Its products are precise and complex, close to the final shape of the part, and can be used directly without processing or with a small amount of processing.

This is an advanced The near net shape process includes: selecting appropriate investment materials (such as paraffin) to make investment molds, repeatedly impregnating refractory paint (main component is silica sol) and spraying refractory sand on the investment mold, hardening the shell and drying , melt the inner investment mold to obtain the mold cavity,

bake the shell to obtain sufficient strength and burn off the remaining investment material, pour the required metal material, solidify, cool, shell, and clean the sand to obtain a high-precision finished product.

Silica sol precision casting, due to its good bonding ability and filling performance, the shell produced has high strength, high gloss and easy demoulding. It is widely used in this field. According to the specific use requirements, it is divided into surface silicone Sol and back silica sol consume huge amounts of money.