VOL 74, No. 3 (2001)

On the basis of the ICS model, a method is proposed for calculating the change in the geometric parameters of curved sheet glass during transportation on a roller conveyor. This technique makes it possible to theoretically determine not only the shape of the product after transportation, but also the characteristics of the process, based on the required level of deformation. Il. 5, bibliography: 3 titles.

Based on the analysis of patent information, scientific and technical literature and developments of the Saratov Institute of Glass, the influence of additives and impurities in tin on the quality of float glass was determined. The mechanism of action of an effective metal additive has been established. A number of activities of impurity components in tin with respect to oxygen and sulfur has been compiled, on the basis of which it is possible to evaluate and predict their influence on the processes of interaction of tin with glass and to control the quality of glass. Bibliography: 7 titles.

The spectra of induced absorption and their relaxation are analyzed, including the behavior of the spectral hole in the region of the exciton band. A model of photochromism as a process of formation of paired defects in a CuCl microcrystal and radiation color centers of the glass matrix on both sides of the microcrystal - glass interface is proposed. Il. 3, bibliography: 6 titles.

The information on high-temperature IR absorption of some glasses published in various literary sources is summarized. The results are supplemented by data from our own research. To solve the problems of radiation-conductive heat transfer, it is proposed to use the integral absorption coefficient calculated for the analyzed glass compositions. The resulting "bank" of data will make it possible to predict the integral absorption of glasses containing some transition elements and, first of all, iron. Tab. 1, ill. 5, bibliography: 7 titles.

The texture and chemical compositions of some basalts of the European North of Russia have been investigated. Modules of density and viscosity are estimated. The possibility of obtaining thin staple and continuous basalt fibers is shown. Technological schemes for the manufacture of materials based on such fibers are considered. Comparative characteristics of various types of fibers and products made from them are given. The financial and economic indicators of the organization of production of basalt fibers and related products are presented. Tab. 3, ill. 4.

The use of pure aluminum oxide for medical purposes is considered. The main properties of corundum ceramics are presented. Tab. 3, bibliography: 11 titles.

The processes of phase formation at all stages of the synthesis of glass-crystalline glaze coatings for ceramics, obtained by the method of directional crystallization of b-spodumene, diopside and ganite, have been investigated. A mechanism for the simultaneous crystallization of a complex of specified phases has been established, the use of which makes it possible to obtain low-melting sitallized glazes with high performance under the conditions of high-speed modes of low-temperature firing. Il. 3, bibliography: 4 titles.

The defect structure of alumina nanopowders and ceramics based on them is studied by the method of electron paramagnetic resonance. Nanopowders have their own structural point defects, which are oxygen vacancies that have captured an electron (F ⁺ centers). Among the impurity defects in nanopowders and ceramics, signals from Fe ³⁺, Cr ³⁺, and Ti ³⁺ ions, occupying different crystallographic positions in Al _{2 About 3 or in separate phases. Tab. 3, ill. 2, bibliography: 9 titles.}

The possibility of using waste from coal mining and metallurgical slags, products of processing of oil shale and household waste for the production of ceramic building materials has been investigated and proved. Practical recommendations are given. Tab. 1, bibliography: 8 titles.

The conditions of formation and physical and mechanical properties of dust emissions, formed in the production of ceramic pigments, have been investigated. Practical recommendations are given. Tab. 1, ill. 1, bibliography: 8 titles.