VOL 72, No. 3 (1999)

A new method of molding porcelain pin insulators used for insulation of wires of low-voltage power lines is proposed. A machine for forming TF-20 insulators is described. A complex of technological equipment for small and medium-sized mini-productions is considered. The technical data of the complex are presented. Il. 5, bibliography: 1 title.

Based on the analysis of patent information, a classification of methods for forming thickened float glass by limiting the lateral spreading of molten glass in the head of the melt bath has been developed. Brief descriptions of the patented methods are given. The main developments of the Saratov Institute of Glass in the field of production of colorless and tinted heat-absorbing glass with a more equilibrium thickness are presented. Il. eight.

The experience of the Bor glass plant has shown that one of the essential factors in increasing the efficiency of the bath glass-melting furnace is the rational distribution of the total gas consumption among the burners. Recommendations for further improving the technical and economic performance of the furnace are given. Tab. 2, ill. 3.

The results of research on the plasma spraying of glass powders on glass substrates are presented. It is shown that in the process of decorative plasma processing of glassware, a coating of a granular structure with good consumer properties is formed. Tab. 3, ill. 1, bibliography: 7 titles.

A porous high-temperature heat-insulating corundum ceramic based on hollow microspheres obtained using plasma has been developed. The ceramic properties, phase composition and microstructure of the obtained material have been investigated. Tab. 1, bibliography: 8 titles.

The chemical composition of the combustion products of mixtures of freely poured powders of industrial zirconium-aluminum alloy (mass content of zirconium 84%) and ultradispersed aluminum powder obtained by electric explosion of conductors in argon has been studied. It was found that, under certain conditions, the final products can contain up to 60% of a mixture of AlN + ZrN. Tab. 2, ill. 1, bibliography: 5 titles.

Polymorphic transitions in Al ₂ O ₃, tungsten bronzes, 2CaO x SiO ₂, ZrO ₂ are considered. Since oxides usually have an excess of oxygen vacancies at high temperatures, a further increase in their concentration due to the introduction of appropriate additives slows down diffusion, prevents the polymorphic transition, and stabilizes the phase. The introduction of additives leading to an increase in the concentration of vacancies in the cation, on the contrary, accelerates diffusion and promotes the polymorphic transition. Bibliography: 10 titles.