VOL 75, No. 6 (2002)

A theoretical justification is given and the results of combining, on one float-line, technological processes for the production of glass tape of various thickness, size, texture and composition of the surface layer are given. Il. 2, bibliography: 7 titles.

The calculation of the limiting level of hardening of sheet glass, based on three classical strength criteria and equal to about 500 MPa, is presented. Il. 3, bibliography: 6 titles.

The experience of synthesis of pyroxene composition sitalls based on the mineral part formed by pyrogasification of solid fuels, in particular, during the processing of oil shale, is generalized. The structure and properties of sitalls obtained by different molding methods have been investigated. Tab. 1, ill. 2, bibliography: 4 titles.

Dispersed powders of tetragonal zirconia stabilized with Y ₂ O ₃, Yb ₂ O ₃ and combined additive (Y ₂ O ₃ + CaO + MgO). Technological parameters of the processes of synthesis and preparation of the initial ZrO ₂ powders intended for the manufacture of ceramics with increased strength parameters are proposed. Tab. 4, ill. 1, bibliography: 6 titles.

The effect of the nature of magnesium salts and a silica-containing component on the synthesis and properties of forsterite powder obtained by the sol-gel method has been studied. It was found that the use of magnesium acetate significantly reduces the temperature of the onset of forsterite formation, and it is preferable to use amorphous types of silica as the silica-containing component. Il. 3, bibliography: 7 titles.

New technical solutions in the technology of forming rod insulators with spiral ribs by drawing them directly from a vacuum press are considered. Positive results of comparative tests of tires with spiral and annular ribs have been obtained. Tab. 1, ill. 1, bibliography: 2 titles.

The influence of the clay component on the formation of the permeable structure of ceramic materials has been studied, and the possibility of using clays of the Tula region as a binder for permeable ceramics has been established. Tab. 2, ill. 3, bibliography: 3 titles.

At temperatures of 1200 - 1400 ° C, samples were synthesized from liquid radioactive waste (LRW) and basalt with a mass content of LRW oxides up to 30%. The obtained glass materials, along with the glass phase, contain crystalline phases (clinopyroxene of aegirine-hedenbergite composition and spinel). Glass materials synthesized from basalt and radioactive slag contain gelenite and silicophosphates, and with an increase in the basalt content in the samples, augite (aegirine-hedenbergite) also crystallizes. Crystalline phases are formed in the synthesized materials, capable of including radionuclides, which leads to a decrease in the rate of their leaching. Il. 4, bibliography: 8 titles.

Thermodynamic calculations have been carried out and the range of pollutants that can be formed during the process of strengthening glass products has been determined, and the level of their calculated concentrations has been established. Tab. 3, bibliography: 3 titles.

The features of the chemical and mineralogical composition of natural topaz-containing raw materials from the "Kopna" deposit and the processes of phase formation during heat treatment of topaz rocks with different ratios of topaz and quartz components have been investigated. The prospects of its use in the technologies of aluminosilicate ceramics for refractory and technical purposes have been established. Due to its good reinforcing properties, acicular and fibrous mullite, formed during the decomposition of topaz, can be used in various composite materials based on glasses, ceramics, polymers, etc. Table. 2, ill. 3, bibliography: 7 titles.