Applications of Silica Sol in the Materials Industry
Release date:
2026-01-29
In the materials industry, silica sol has attracted attention as a new material due to its outstanding fire resistance and acid resistance.
In the materials industry, silica sol has attracted considerable attention as a new material due to its outstanding fire resistance and acid resistance. When silica sol—prepared by reacting sulfuric acid with silicic acid containing silicon dioxide—is used to treat ceramic acid-resistant containers, these containers become impermeable and can also withstand higher pressure.
Using silica sol with a small particle size instead of ethyl silicate to manufacture thin shells results in high strength and excellent surface finish, significantly improving the quality and dimensional accuracy of castings, reducing costs, and enhancing operating conditions. Adding silica sol to CO2-based coating agents can improve workability and increase the strength of sand molds.
Silica sol can also serve as an adhesive for acid-resistant cement, various thermal insulation materials, and silicate materials. It boasts strong adhesion, acid resistance, and high-temperature resistance, making it widely used in the ceramics and refractory industries. A major issue on the surface of cast steel is that small amounts of steel ingots often stick to the casting molds and baseplates, thereby affecting the quality of the metal products.
If a silica sol is mixed with refractory material powders (such as silicon dioxide, aluminum oxide, zirconium oxide, iron oxide, etc.) and applied to the surfaces of heat-resistant and corrosion-resistant containers like steel ingot molds and iron molds, this high-temperature protective coating can withstand extremely high temperatures, safeguarding the working surfaces of casting molds and base plates, significantly reducing mold wear, and ensuring easy demolding. Furthermore, if the silica sol is combined with materials such as amines, thiourea, and zinc powder to form a coating, it can serve as a protective material for steel surfaces, with performance—particularly its rust-prevention capabilities—far surpassing those of lithium silicate-zinc powder coatings.
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