What is the position of silica sol investment casting in the casting industry?

Silica sol casting is a kind of casting process that people often hear at present. Silica sol precision casting factories have a good understanding of it. Investment casting can be divided into three types:

1. Silica sol casting;

2. Sodium silicate casting;

3. Composite mold casting;

The difference between the three silica sol casting methods is that the raw materials for making wax and shell are different. Take silica sol as an example, use ultra-low temperature wax and normal pressure wax to make wax mold, and then replace the wrong sand, refractory sand, wrong powder and silica sol to make casing. According to the personalized requirements of each new product, 4-8 casings can be made; In the sodium silicate process, ultra-low temperature wax is used to make wax models, and then sodium hydroxide solution and quartz sand are used to make casings; The composite process is the overlapping of the first two processes, the first two or three layers are silica sols, and the second two layers are water laminated glass.

Comparing the three processes from the specifications, the silica sol is particularly suitable for making a small piece, and the surface will be more delicate. The fine roughness value can reach the middle of RA3.2-6.4, and the tolerance size manipulation will be better. In addition, if the silica sol process is used, some places can be formed at one time without production and processing, and many costs can be saved. The composite type system is not as technical as silica sol in terms of surface and tolerance dimensions, but the composite type technology makes more castings, which is stronger than sodium metasilicate in terms of specification and external surface, sometimes reaching Ra6.4-12.5. Compared with the composite process, the sodium metasilicate of the silica sol precision casting is one level lower.

In that case, what are the application aspects of silica sol in investment casting for investment casting manufacturers?

Silica sol is mainly used as an adhesive for silica sol casting, which is suitable for the production of improved coatings and surface coatings for shell manufacturing. The silica sol precision casting factory will use small particles of silica sol to replace magnesium ethyl chloride in the precision casting, which can not only reduce the casting cost of the silica sol precision casting company, but also improve the working environment and conditions. When silica sol is used for thin shell investment casting, the shell mold strength will increase, and the smoothness and machining accuracy of the casting will also improve. The forming quality is better than sodium metasilicate, and the price is less than magnesium ethyl chloride. For large and medium-sized castings, it is more appropriate to use silica sol for castings with high requirements for surface smoothness and castings with unnecessary capacity or small allowance. As a high temperature resistant coating in investment casting, silica sol can make the architectural coating have better wear resistance and temperature resistance, reduce the outflow of molten metal to the mold in high temperature environment, and facilitate the casting out of the mold.