Application of silica sol in refractory materials

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Zinc alloy die castings are widely used in the field of refractory materials, as adhesives for silicate ceramic fibers, fireproof insulation blocks, and corrosion-resistant concrete. The plate corundum is used as the stone material, and mullite is used as the fusion phase. Reflective sintering is used. The legal system is made of mullite fused with corundum, a refractory material. In order to improve the physical properties of composite refractory materials, SiO2 micropowder is used as the source of silicon to generate mullite, and attempts are being made to introduce silica sol to replace some of the SiO2 micropowder. The results show that the introduction of silica sol can promote the formation of mullite, make the ultrastructure more uniform and high density, and significantly improve the hardness of raw materials and stress relaxation resistance at high temperatures. When fired at 1550°C, the sample prepared by using silica sol instead of 4% (mass concentration, the same) SiO2 micropowder as the silicon source is different from that of the sample prepared by using SiO2 micropowder as the silicon source at room temperature and high temperature. The increases are 40.16% and 29.92%; when fired at 1650 °C, the high temperature stress relaxation rate of the former is 71% lower than that of the latter. The load-deformation test data show that the mullite-fused corundum refractory material ruptures gradually at room temperature, and the introduction of silica sol into stainless steel silica sol investment casting fittings enhances the impact toughness of raw materials at room temperature to a certain extent.

Using silica sol as a fusion agent, it is not easy to deteriorate its performance index due to the addition of low-melting point metal oxides by the complexing agent at high temperature. The cultivation matrix of monolithic refractories is composed of special or first-class high-alumina cement clinker and silica powder and forms a needle-column secondary mullite network structure at high temperature. Therefore, it has the advantages of high temperature resistance, high temperature resistance strength, high temperature volume stability, and good resistance to sudden changes in ambient temperature. The invention relates to the industry of porcelain-shaped products with silicate as the raw material, and especially relates to the production method of fire-proof, heat-insulating, and heat-insulating plywood. The general aluminum silicate chemical fiber or high alumina fiber after slag discharge is selected as the cultivation substrate, and 0–60 (net weight)% of high alumina aluminum silicate stone powder is added as the filler as required, and appropriate high-quality silica sol castings are used. Silica sol as an inorganic fusion agent, cationic tapioca starch or carboxymethyl cellulose as an organic binder, mixed with appropriate water and made into furniture boards by mixing, forming, and drying processes, or in seasoning add an appropriate amount of white glue, and make special-shaped plywood by mixing, forming, special-shaped processing, extrusion, and drying.

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