VOL 74, No. 9 (2001)

The technique and results of using mathematical models for statistical analysis and control of the annealing mode of a moving glass ribbon in a tunnel furnace are presented. The results of a computational experiment on evaluating the efficiency of control algorithms for the annealing regime are indicated. The possibility of reducing waste and improving the quality of annealing of polished glass is shown. Tab. 4, ill. 3.

The attraction of glass particles simulating grains of quartz sand by capillary collars of aqueous solutions of sodium sulfate and sodium carbonate of various concentrations is experimentally studied. It is shown that the attraction of particles in the first moments of contact with the bridge liquid is due to capillary interaction. With the evaporation of water and saturation of the solution, additional adhesion of solid particles was found, caused by the formation of crystallization contacts. Il. 5, bibliography: 2 titles.

Optimal parameters of glass cutting are investigated and substantiated: material and angle of sharpening of glass-cutting rollers, load on them, the role of wedging liquid and the influence of these parameters on the quality of the glass edge. Il. 2, bibliography: 5 titles.

A new method is proposed for predicting optical distortions in tempered glass, which clarifies the previously proposed dependences. The nonlinear dependence of the elastic modulus on the glass temperature has been introduced. Il. 2, bibliography: 5 titles.

The analysis of literature and patent data on the problem of obtaining and using wollastonite and materials based on it is carried out, information on the results of studying the properties of heat-insulating products obtained by vacuum pumping technology is briefly presented. The fundamental possibility of using natural wollastonite as a raw material for the production of heat-insulating products has been proved. Il. 2, bibliography: 17 titles.

The processes proceeding according to two variants of the synthesis of composite powders in the Al ₂ O ₃ - TiN system: according to the reaction of carbothermal reduction of TiO ₂ located in mixtures with Al ₂ O ₃, with simultaneous nitriding, and also according to the scheme of direct nitriding of metallic titanium dispersed in aluminum oxide, with high-frequency heating in a "cold" crucible. As a result of the synthesis, submicron composite powders are formed, which are promising for use in structural ceramics. Il. 3, bibliography: 8 titles.

It is shown that the Sultan-Uvayskoye deposit (Uzbekistan) is a promising source of high-quality kaolin for the production of fine ceramics and refractories. Tab. 1, ill. 2.

The rheological and structural-mechanical properties of dispersions based on coarse-grained corundum with additives that ensure the production of porous permeable ceramics have been studied. It has been established that the combined use of additives of different nature stabilizes the molding properties of the masses with a change in their composition and moisture content, makes it possible to change the structural and mechanical type, and, consequently, the molding conditions and maintain the configuration of the blanks. Tab. 2, ill. 1, bibliography: 9 titles.

Possibilities of decreasing porosity and increasing mechanical strength of majolica masses based on clays of the Gzhel deposit with additives of 3 - 10% of broken glass have been studied. The ceramic properties of the products obtained meet all the technical requirements for majolica. Tab. 2, ill. 2, bibliography: 1 title.

The results of studies of changes in the basic physical and technical properties of clay-silicon carbide refractories made on the basis of the breakage of silicon carbide plates by the slip casting method, with their repeated heating and cooling, are presented. The obtained refractories are recommended to be used in the production of fine ceramics as stacks and capsules. Tab. 4, ill. 1, bibliography: 4 titles.