VOL 83, No. 11 (2010)

The features of the influence of the composition and structure of glasses in the Na ₂ O - CaO - B ₂ O ₃ - SiO ₂ and Na ₂ O - CaO - B ₂ O ₃ - Al ₂ O ₃ - SiO ₂ on the temperature dependence of viscosity in the range of 10 ¹⁰ - 10 ⁴ Pa · s. A significant influence of the processes of phase separation - liquation and crystallization - on the viscosity indices in the temperature range of the transition from the plastic state to the liquid state is shown. Tab. 1, ill. 4, bibliography: 2 titles.

Glasses of the Na ₂ O - В ₂ O ₃ - SiO ₂ system with a content of В ₂ O ₃ from 20 to 40%. It was shown that with a gradual increase in boron oxide content, the silicate network undergoes depolymerization, which is confirmed by a change in the ratio of the intensities of the bands characteristic of tetrahedra with different numbers of nonbridging oxygen atoms ( Q ² and Q ³). The borate component contains BO ₄ tetrahedra, which are then replaced by asymmetric BO ₃ triangles with nonbridging oxygen atoms. Il. 3, bibliography: 5 titles.

The effect of diopside raw materials with a high diopside content on the properties of building ceramics from masses containing diopside concentrate (85, 90 and 95%) with a dispersion of up to 150 ?m and sodium silicate glass has been investigated. The possibility of using natural diopside as the main component of natural diopside obtained during the primary processing of the concentrate without wet grinding of the charge is shown. Tab. 4, ill. 5, bibliography: 5 titles.

The solid-phase synthesis of gadolinium titanate, stannate and zirconate has been studied. It was shown that these compounds can be obtained at 700 ° C. Obtained ceramics based on Gd ₂ Zr ₂ O ₇, Gd ₂ Ti ₂ O ₇, Gd ₂ Sn ₂ O ₇. It was found that the partial substitution of Zr, Ti, and Sn (IV) with each other makes it possible to reduce the sintering temperature. Tab. 1, ill. 4, bibliography: 5 titles.

The possibility of obtaining titanium carbosilicides by the method of self-propagating high-temperature synthesis from materials based on the FeSi - Ti - C system is shown. The microstructure and phase composition of the synthesized materials Ti ₃ SiC ₂ and Ti ₅ Si ₃ C _x (x & lt; 1). Il. 4, bibliography: 5 titles.

Some features of the mechanism of glass formation of basalt melt are presented. The influence of the characteristics of the basalt melt on the quality of continuous fibers is shown. The advantages of the multi-station technology for the production of continuous basalt fiber have been substantiated. Tab. 1, ill. 5, bibliography: 9 titles.

The possibility and prospects of using cement production waste (dust from electrostatic precipitators) in glassmaking have been assessed. It is shown that the introduction of 5 to 15% of dust into the charge makes it possible to completely exclude sodium sulfate and chalk from the composition of the charge. An increase in the content of fine dust in the charge intensifies sintering and favors an increase in the specific surface area of ??the charge and the strength of the pelletized samples. At a fixed processing temperature, as the dust content increases, the weight loss decreases. Tab. 5, ill. 2, bibliography: 3 titles.

The results of a two-stage synthesis of tricalcium phosphate by the wet method followed by high-temperature treatment are presented. The influence of the introduction of tricalcium silicate and alkaline silicate glasses in the formation of biocomposite materials based on dicalcium phosphate dihydrate (DCPD) is considered. It was found that the use of bioactive glass 50S25N5P in an amount of up to 10% by weight increases the compressive strength and pH values ??to a physiologically safe level in the composite material in comparison with unmodified DCPD. The resulting composite ensures the formation of osteoid tissue for 30 days. Il. 6, bibliography: 4 titles.

The possibility of synthesizing ceramic composites based on mixtures of powders of two types of biocompatible glasses and potassium polytitanate has been investigated. It is shown that in the course of interaction of the obtained composites with a solution simulating blood plasma, a porous structure is formed on the surface of the material, reinforced with fibers of potassium hexatitanate or calcium titanate; at the same time, the pores are filled with hydroxyapatite, which should facilitate the growth of bone tissue into the structure of implants made on their basis. Tab. 2, ill. 2, bibliography: 12 titles.