VOL 72, No. 6 (1999)

A variant of the physicochemical explanation of the effect of mechanochemical activation of glass powders after grinding cullet in high-intensity mills (shock-reflective, etc.) with the use of the provisions of the thermodynamics of irreversible processes is proposed. Il. 2, bibliography: 3 titles.

The effect of the content of water vapor and oxygen in the atmosphere of a tin molten bath on the microhardness of the surface layers of float glass from various enterprises in Russia and Ukraine has been studied. It is shown that an increase in the water vapor content does not lead to a significant decrease in the surface microhardness. At the same time, an increase in the concentration of molecular oxygen causes a decrease in the surface resistance to the action of abrasive particles. Il. 1, bibliography: 5 titles.

The effect of laser radiation with different pulse duration and pump voltage on ceramic materials is investigated. Amorphization of the structure of the ceramics in the zone of the laser beam was established. The processing of materials with laser beams leads to the formation of radial microcracks with a size of 40 - 50 microns. Tab. 3, ill. 5, bibliography: 13 titles.

The literature on the synthesis and research of various crystalline glazes is summarized. Typical types and compositions of glazes, as well as their structural features, firing mode and areas of application are given. The influence of the phase composition on the decorative properties of crystalline glazes is shown. Tab. 1, bibliography: 19 titles.

The influence of the heating rate on the density, water absorption and Young's modulus of ceramic materials based on clays of various mineralogical compositions has been investigated. It was found that the optimal heating rate depends on the mineralogical composition and functional parameters of the ceramics. Tab. 3, bibliography: 4 titles.

The application in the production of high-voltage insulators of enriched kaolin of the "Zhuravliny Log" deposit instead of Prosyanovsky kaolin has been investigated. The resulting products have higher mechanical and electrical performance. Tab. 4, ill. 3, bibliography: 2 titles.

The possibility of obtaining by low-temperature proton-carbon treatment of wurtzite-like boron nitride with a microcomposite structure in the form of nanotube packages has been studied. It is shown that the formation of nanotube stacks far from the processing zone is associated with collective shear deformations of layers from self-organizing blocks. Tab. 2, ill. 3, bibliography: 5 titles.

The influence of montmorillonite on the sintering of kaolin and kaolinite-montmorillonite clay materials of East Kazakhstan has been investigated. It was found that the optimal amount of introduced montmorillonite (30%) promotes the intensification of the sintering of clay materials. Tab. 3, ill. 2, bibliography: 4 titles.

It is shown that the main factor determining the high electrical conductivity of heat-treated titanium-containing phosphate coatings is a decrease in the electrical resistance of oxide films on the surface of titanium particles. Il. 1, bibliography: 7 titles.