Published in Refractories and Industrial Ceramics
The paper sums up experimental studies on aerodynamic separation of disperse-type rocks with special reference to beneficiation of Callovian clays and reports the natural radionuclide content of various minerals and materials. Basically new, competitive designs of aerodynamic separators are reported.
Published in Refractories and Industrial Ceramics
The paper sums up a study that had as its objective to develop MgO−Al2O3−Cr2O3 refractories of increased corrosion resistance for harsh service conditions. The refractories thus developed, designated PShKhM-1 and PShKhM-2, have better high-temperature strength and abrasion resistance than PKhS refractories manufactured commercially. The experimenta...
Published in Refractories and Industrial Ceramics
An experimental lot of special- and general-purpose grog refractories was fabricated. Mottled clay was added to the mix to enhance the density and strength of the ware. Properties of experimental and commercial products are listed. It is shown that mottled clay can well be used instead of plastic clay in the manufacture of grog refractories from Vl...
Published in Refractories and Industrial Ceramics
The theoretical views underlying the manufacture of unfired light-weight fireclay refractories are set forth. It is hypothesized that fireclay mixes should include a chemically active ingredient to act as a catalyst and an electrolyte and to promote the active synthesis of high-temperature structural elements in the course of molding in a heat-and-...
Published in Refractories and Industrial Ceramics
A technique is proposed whereby recrystallization can be investigated quantitatively in a ceramic material composed of grains widely ranging in size (due to localization of sintering) and containing grain-boundary barriers (such as impurities and micropores) that vary in spatial distribution and quantity. It is shown that only primary recrystalliza...
Published in Refractories and Industrial Ceramics
The paper sets out an information-technology approach to the search, systematization, and development of automatic control systems for heat treatment of disperse materials. The objective of the approach is to find a solution to the problem of information sufficiency in analysis and comparison of systems differing in both structure and the dynamic b...
Published in Refractories and Industrial Ceramics
A study is summed up on the microstructure and mechanical properties of ceramic-matrix composites using silicon nitride, Si3N4, as the matrix and SiC whiskers as the reinforcement. It has been found that an Si3N4 matrix synthesized by a plasmachemical process and long SiC whiskers (with a length-to-diameter ratio of more than 50) enhance crack resi...
Published in Refractories and Industrial Ceramics
The electrophysical properties of perovskite solid solutions in the system CaTiO3−La2O3 were investigated in the La2O3 concentration range of 0–40%. The composition dependences of permittivity, loss tangent, volume resistivity, and temperature coefficient of capacitance were plotted. The perovskite solid solutions under study hold special promise a...
Published in Refractories and Industrial Ceramics
Workers of the Azovstal’Company have established the causes of the decrease in the endurance of slag-line areas of linings of 350-ton steel-teeming ladles. In 1995–1996 they conducted industrial tests and introduced a process for lining the slag areas of 350-ton teeming ladles with unfired periclase-carbon refractories. The mean service life of a l...
Published in Refractories and Industrial Ceramics
The present paper is devoted to the least studied topic in the field of use of modern electric heating equipment, namely, pollution of the atmosphere by nitrogen oxides and reduction of the intensity of this effect by coating furnace linings. Experimental and theoretical estimates of reduction of the emission of nitrogen oxides in electric furnaces...
