Investment casting materials

The materials used for manufacturing precision investment casting shells can be divided into two types, one is used to form shells directly, such as refractory materials, adhesives, etc.; the other is to obtain high-quality shells and simplify operations , Improve the materials used in the process, such as flux, hardener, surface active agent, etc. The most common binder used in investment casting is colloidal silicate solution (silicate sol for short), such as ethyl silicate hydrolysate, water glass and silica sol. They are mainly composed of silicic acid (H2SiO3) and solvents, and sometimes stabilizers, such as NaOH in silica sol.

Ethyl silicate hydrolyzate is the earliest and most common binder used in the casting of silicate sol molds obtained by hydrolysis of ethyl silicate; the water glass shell is easy to deform and crack, and the dimensional accuracy of castings cast with it The surface finish is poor. However, in our country, when producing carbon steel castings with higher precision requirements and non-ferrous alloy castings with lower melting points, water glass is still widely used in production; silica sol has good stability and can be stored for a long time. Special hardener is needed, but the wetting of the investment mold by silica sol is slightly worse. The shell hardening process is a drying process and takes a long time.

Founded in 2003, Ningbo Suijin Machinery Technology is located in Ningbo city ,Zhejiang Province, We manufactured all kinds of lost wax investment castings and machining parts or called precision investment castings, We use high-quality materials for investment casting, material including carbon steel, alloy steel, and stainless steel. we also can according to the customers' requirement to compound the material, Our factory has a floor space of 33,000 square meters and another 18000 square meters of building area, which contain both casting foundries and CNC machining area. The two advanced lost wax casting and investment casting production lines have a capacity of 5000 tons lost wax castings and 1000 tons investment castings per year.