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Precision casting-silica sol process

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2020-10-20

With the increasing requirements for the quality and precision of precision castings, the "inaccurate manufacturing in Zhengzhou" and environmental pollution caused by the manufacturing process using water glass or ethyl silicate as the binder have seriously hindered the development of China's foundry industry. Therefore, in order to improve the quality of castings and narrow the gap with the international foundry industry, it is essential to replace water glass and ethyl silicate with silicon.

Silica sol is a kind of refractory bonding agent. Sodium silicate or organic compound of silicon, the binding agent made by physical and chemical treatment, also called silica sol. Silica sol is a colorless or milky white transparent colloidal solution, formed by dispersing SiO2 colloidal particles in an aqueous solution, and has good bonding properties.

There are five ways to make silicon. (1) Ethyl silicate hydrolysate (see ethyl silicate binder); (2) Electrolysis, dialysis and electroosmosis with sodium silicate (water glass) solution (3) Treatment of gaseous fluorine with sodium silicate method; (4) Manufactured by the interaction method of sodium silicate, glyoxal and aqueous hydrochloric acid. (5) Use sodium silicate solution in ion exchange.

However, the ion exchange method is widely used to remove Na and Cl from the sodium silicate solution.

Silica sol casting is also called investment casting. The casting process with little or no cutting is widely used as a super craft technology in the foundry industry. It is not only suitable for casting of various types and alloys, the dimensional accuracy and surface quality of the produced castings are higher than other casting methods, and even the complex, high-temperature resistant, and difficult-to-process castings that are difficult to cast by other casting methods can use melt. The mold is precision cast.

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