VOL 78, No. 7 (2005)

The relevance of the study of heat and mass transfer in a glass-making furnace with a horseshoe-shaped flame direction has been substantiated. The basic requirements for the rational length of the torch in furnaces of this type are formulated. The necessity of joint solution of external and internal problems of heat transfer is shown. The results of calculating the temperatures of the gaseous medium, the surfaces of the vault and the molten glass, depending on the length of the torch are presented. It has been established that, according to the set of conditions, the rational length of the torch can be taken equal to the length of the furnace. In this case, the length of the zone of intense combustion (visible part of the flame) is approximately 0.7 of the length of the furnace. Tab. 1, ill. 3, bibliography: 9 titles.

The necessity of using geodetic measurements to identify deformation processes on the rotating surfaces of roller conveyors of industrial lines for the production of flat glass is substantiated. A description is given and the principle of operation of the geodetic instruments used in this case is considered. Il. 3.

The effect of an active substrate on the process of liquid-phase reduction of paranitrotoluene (P-NT) on a highly porous cellular palladium catalyst (HPNPK) has been studied. The rate of the reduction reaction was determined at a 50% conversion of the initial nitro compound in the temperature range 52 - 58 ° C on an HPNPC, for which various oxides and their sulfated forms were used as an active substrate. It was shown that the highest rate of P-NT hydrogenation was achieved when using HPNAP with an active substrate of sulfated ZrO ₂ and g-Al ₂ O ₃. The constants of the P-NT reduction process and the load of the nitro compound on the catalyst were calculated, which were also the highest for HPNAP with substrates of sulfated ZrO ₂. Tab. 2, ill. 2, bibliography: 5 titles.

The sintering of corundum by the liquid-recrystallization mechanism with the introduction of additives of borosilicate glasses of eutectic composition is investigated. The comparative efficiency of floating additives has been determined. The structure of the melts has been studied. A chemical factor affecting sintering has been identified, and ratios for a quantitative assessment of this effect have been proposed. Tab. 4, ill. 2, bibliography: 15 titles.

The possibility of obtaining glaze coatings for sanitary ceramics without the use of toxic components - barium carbonate and zinc oxide - is considered. Regularities of changes in the physicochemical properties of glazes (gloss, whiteness, microhardness, LTEC) are revealed depending on the chemical composition in relation to the features of their structure and phase composition. Il. 2, bibliography: 7 titles.

The properties of alkaline borotitanosilicate glasses with different contents of boron, titanium and lithium oxides have been investigated. It is shown that on the basis of glasses with a low content of В ₂ О ₃ (8 - 10%), it is possible to obtain white glass enamel coatings, which are characterized by increased corrosion resistance and low leachability of the coating components in acetic acid solutions. Il. 2, bibliography: 3 titles.

The operational characteristics of the protective coatings of pipelines are analyzed. It is shown that the most promising and durable is glass enamel coating. The results of measurements of microhardness and impact strength of enamels are presented. Recommended compositions of enamels to protect the surface of steel pipes from corrosion. Tab. 2, ill. 1, bibliography: 1 titles.

The performance of a diamond-abrasive annular tool based on lamellar elements and radially working patches used in production conditions for rough grinding and milling of the planes of optical glasses and other brittle materials is analyzed. Tab. 2, ill. 3, bibliography: 5 titles.

The process model of batch preparation and the role of the quality management system in improving product quality are considered. Il. 3, bibliography: 1 title.