Application of silica sol in thermal insulation refractory materials

2024-03-27 15:06:00

A series of silica sol products customized and developed for the application of heat-insulating refractory materials. They have the characteristics of strong adhesion, good corrosion resistance, good thermal shock resistance, and high temperature resistance of 1600°C. They can be used as adhesives for refractory materials, thermal insulation materials, etc. The binder makes the material high in strength, has good high-temperature volume stability, and has good thermal shock resistance. It can also improve the product’s resistance to oxidation and slag erosion.

Under the current situation of increasing energy shortage, the research on thermal insulation materials has become one of the key technical issues for energy saving and consumption reduction. Increasing the use temperature of thermal insulation and refractory materials can reduce or even eliminate the working layer. Therefore, the development of thermal insulation and refractory materials for use at high temperatures Materials are of great concern. Mullite lightweight refractory materials are widely used in industries such as metallurgy, glass, ceramics, chemistry, electricity, gas and cement due to their excellent properties such as high temperature resistance, low creep rate, and high load softening temperature. At the same time, higher operating temperatures also put forward higher requirements for the selection of binders. Existing insulation materials mostly use cement as a binder, but the addition of cement will have an adverse effect on the high-temperature strength of the castables. Silica sol is a colloidal dispersion formed by nano-SiO2 particles dispersed in an organic solvent. It is a refractory material binder used at high temperatures. It overcomes the shortcomings of cement binders that are too sensitive to temperature. At the same time, the highly active nano-SiO2 particles in silica sol are as active as Aluminum oxide powder reacts at high temperature to generate mullite whiskers, which increases the bonding strength of the sample.

More industry applications include: 1. When making ceramic stoves, silica sol is used as the binder of ceramic fibers, and the aluminum silicate fiber felt is impregnated with silica sol, and a coagulant is added to make a thermal insulation felt. Adiabatic effect. 2. The cookware is added with silica sol and is non-flammable, smoke-free and environmentally friendly. 3. When making the transformer core, use silica sol as a binder to bond the silicon steel sheets into one piece, which can also play the role of insulation and high temperature resistance. 4. When making silicon steel, adding a certain amount of silica sol to the coating solution can improve the appearance, insulation performance, and heat resistance of the insulation coating, reduce the expansion coefficient of the coating material, and improve the magnetism of silicon steel.

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