VOL 74, No. 5 (2001)

The conditions for the distribution of the indicator - yttrium oxide, introduced with the charge, over the width and thickness of the glass ribbon during its production on the metal melt are considered. It is shown that in the thickness of the strip, the marked newly welded molten glass is located in the form of luminescent layers, the number of which increases with time up to a uniform distribution of the indicator in the strip. It was found that the decisive role in the distribution of the labeled molten glass in the glass ribbon is played by the transverse convection of the molten glass. Tab. 2, bibliography: 6 titles.

The proposed method for calculating the impact strength of triplex proved the possibility of further improving its design based on glass subjected to complex heat treatment. Il. 2, bibliography: 3 titles.

Possible stages of interaction of glass with a film-forming solution are considered. The influence of the amount of acid and water in the solution on the destruction of glass is shown. An analysis is given of the relationship between the amounts of Na ₂ O and SiO ₂ with each other and with the width of the transition layer. Tab. 1, ill. 3, bibliography: 5 titles.

Using the method of mathematical statistics, a model has been obtained in the form of a linear regression equation, which adequately describes the change in the light transmission of float glass colored in the mass in the visible and IR ranges, depending on the change in the main technological factors. Tab. 1, ill. 1, bibliography: 2 titles.

A technology for the manufacture of ultrafiltration ceramic membranes by the sol-gel method has been developed. Experimental batches of membranes with selective layers based on SiO ₂, TiO ₂ and ZrO ₂ were obtained, their characteristics were studied. Tab. 2, ill. 4, bibliography: 4 titles.

An approach to determining the thermal stability of structural ceramics by thermal cycling of specimens with a special notch is considered. Characteristics of thermal shock resistance are proposed: the magnitude of the loss of crack resistance after thermal shock, the insensitivity of the material structure to defects formed at the apex of the notch as a result of thermal shock, and the degree of their accumulation at the apex of the notch. The test results are given for ceramics made of Al ₂ O ₃, ZrO ₂, partially stabilized with Y ₂ O ₃ (molar fraction 3%), and cermet ZrO ₂ -Y ₂ O ₃ (molar fraction 3%) with the addition of metallic chromium (volume fraction 50%). Tab. 3, ill. 6, bibliography: 10 titles.

The composition of a low-melting jade glaze based on a silica-containing rock - diatomite and a technology for applying glaze to building ceramics have been developed. The elimination of the fritting process of the glaze melt can significantly reduce energy costs. Tab. 1, ill. 1, bibliography: 1 titles.

The possibility of using chromium-containing waste from electroplating industries for the preparation of colored glazes is considered. Bibliography: 5 titles.

Defects of thin aluminum coatings on silicate glasses have been investigated by means of X-ray electron spectroscopy, secondary-ion mass spectrometry and optical microscopy. The reasons for the appearance of defects are considered. Tab. 1, ill. 1, bibliography: 2 titles.

The results of studies of the interaction of glass particles sprayed with a plasma torch with a glass substrate are presented. It is shown that the main factors that form the quality of the decorative coating on glass products are the parameters of the plasmatron operation and the temperature of the preheating of the substrate. Tab. 1, ill. 1, bibliography: 5 titles.

The influence of the physicochemical properties of glass-forming colloidal solutions (SCR) and technological parameters on the production of glass coatings for steel has been investigated. Optimal modes of SCR deposition and reflow of SCR deposition products synthesized on the basis of TEOS and nitrates of mono- and bivalent metals have been developed. Tab. 1, ill. 4, bibliography: 6 titles.

The effect of oxides of variable valence on the adhesion strength and elasticity of soilless fluorine-free coatings has been studied. The possibility of reducing the content of cobalt oxide in the composition of enamels due to the introduction of oxides of variable valence (NiO, CuO, MnO ₂) in the optimal ratio without deteriorating the technological and operational properties of glass enamel coatings has been established. Tab. 1, ill. 2, bibliography: 5 titles.

The effect of the concentration of Na and Ca chlorides and their mixtures, as well as of return water after filter pressing, on the properties of plastics, suspensions, semi-dry billets and high-voltage fired porcelain has been studied. It is shown that the use of retur ensures the preservation of the main technical properties of the semi-finished product and the quality of porcelain. Tab. 4, ill. 2, bibliography: 6 titles.