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Cement-Free Refractory Concretes. Part 3. Very Fine Forms of Silica as Effective Refractory Concrete Components

  • SCIENTIFIC RESEARCH AND DEVELOPMENT
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Refractories and Industrial Ceramics Aims and scope

Matrix systems of many types of cement-free refractory concretes (CFRC) have a certain content of highly dispersed components of silica composition, i.e., silica sols, SiO2 nanoparticles (in HCBS of different compositions), as well as fine silica (“microsilica” MS). The degree of their dispersion and hydration (lyophilic nature), determined by their specific surface, is considered. It is shown that the dispersion medium of HCBS containing SiO2 is a relatively concentrated silica sol. With respect to hydrophilic and colloidal chemical characteristics, SiO2 nanoparticles in HCBS with comparable dispersion are similar to ordinary silica sols. The advantage of SiO2 nanoparticles in HCBS compared with silica sols is that they are characterized by polydispersion (from 5 – 10 to 100 nm) and purer chemical composition. As a rule silica sols contain 0.2 – 0.4% Na2O. Compared to CFRC based on a silica binder the advantage of using HCBS as a ceramic concrete matrix system is that it contains all components in an optimum ratio, i.e., not only binders in the form of nanoparticles and a micro-filler (as an MS analog) in the form of particles 0.1 – 2.0 μm, but also polydispersed particles (1 – 100 μm) of corundum or high alumina composition.

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  1. OOO NVF Kerambet-Ogneupor, St. Petersburg, Russia

    Yu. E. Pivinskii

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Parts 1 and 2 of the article published in Novye Ogneupory Nos. 9 and 11 (2019).

Translated from Novye Ogneupory, No. 1, pp. 28 – 38, January, 2020.

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Pivinskii, Y.E. Cement-Free Refractory Concretes. Part 3. Very Fine Forms of Silica as Effective Refractory Concrete Components. Refract Ind Ceram 61, 31–39 (2020). https://doi.org/10.1007/s11148-020-00427-x

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