VOL 74, No. 10 (2001)

A program for calculating the performance characteristics of container glasses has been developed. The accuracy of determining the calculated values ??comparable to the experimental one was achieved thanks to the chosen algorithm and the use of correction factors established on the basis of a solid data bank of compositions and properties of container glasses. Tab. 3, bibliography: 8 titles.

The influence of various propping liquids on the glass cutting process is analyzed: on the wear of the cutting edge of the roller, the breaking force along the applied cutting line, the load on the glass cutting roller. The results of studies of the effect of proppant liquids on chip formation and their wash-off from the glass surface are presented. Tab. 2, ill. 1, bibliography: 2 titles.

Taking into account the change in the thermal transparency of the molten glass, non-standard situations that arise during the operation of a multi-ton bath furnace are analyzed. It is shown that an increase in the amount of introduced breakage, a decrease or temporary cessation of glass production worsen its thermal transparency. Tab. 2, bibliography: 5 titles.

Experimental data on the effect of thermal, impurity, and nonstoichiometric vacancies on the diffusion creep of oxide ceramics at high temperatures and low mechanical loads are presented. It is shown that impurity and nonstoichiometric vacancies have the main effect on creep for materials of technical purity. The experimental data are fully described within the framework of the quasi-chemical approach, according to which the concentration of vacancies is determined by the law of mass action for the corresponding reactions of defect formation. Il. 8, bibliography: 16 titles.

The influence of refractory chamotte, additives of granite screenings, dolomite on alkali resistance and other properties of ceramic materials synthesized on the basis of refractory clay is considered. The regularities of changes in the properties of fired specimens depending on the RO / R ₂ O ratio in the initial composition have been established. Tab. 1, ill. 1, bibliography: 1 titles.

The author's many years of experience in the field of ceramic pressing technology are summarized, which can be used by specialists both when creating technological processes for the production of ceramics at enterprises, and for improving existing technological processes in order to improve the quality of products. Il. 3, bibliography: 7 titles.

As a result of shock-wave action on amorphous aluminum hydroxide, placed in a brass cylinder of a conservation ampoule, it was possible to synthesize two crystalline phases with a spinel structure: ZnAl ₂ O ₄ and (Zn _0.3 Al _0.7) Al _1.7 O ₄. X-ray diffraction patterns and lattice parameters of the obtained phases are presented. Tab. 1, ill. 1, bibliography: 6 titles.

The photoluminescent properties of beryllium ceramics obtained by the method of semi-dry pressing, without and with specially introduced impurities of alkali metals, have been studied. It is assumed that the heat treatment of the samples in hydrogen and the introduction of small amounts of lithium and sodium impurities lead to the appearance of additional luminescence centers, which increase the photoluminescence intensity. On the contrary, high concentrations of the impurity phase quench the photoluminescence. In the case of heterovalent substitution of Be ²⁺ by Li ⁺ or Na ⁺ ions, additional oxygen vacancies arise, on which electrons can be localized under irradiation and F ⁺ -centers. Tab. 1, ill. 2, bibliography: 6 titles.

An effective solution to the problem of synthesis of glass composite heat-resistant coatings with a sitall structure, intended for protection against high-temperature corrosion of expensive and scarce steels and alloys, is considered. Sitall glass matrix was developed on the basis of metallurgical industry waste. Il. 1.

The results of studies on plasma treatment of nickel (II) oxide and silicate glass are presented. It is shown that argon plasma has weakly reducing properties. Tab. 1, bibliography: 17 titles.

It is shown that for processing high-quality and artistic glass during its further chemical polishing, it is advisable to use grinding wheels with a 50% concentration of AC15 diamond powder and grinding wheels with a 35 - 50% concentration of AC6 diamond powder. Il. 3, bibliography: 5 titles.