V. I. Vereshchagin

Structure and strength of foam-glass-crystalline materials produced from a glass granulate

The microstructure of foam-glass-crystalline materials has been investigated using the energy-dispersive X-ray analysis, Auger electron and infrared spectroscopy, high-resolution scanning electron microscopy, and X-ray diffraction analysis. The strength of the materials is determined and proves to be higher than that for the foam glass prepared from a glass cullet. This is a consequence of the structural effect associated with the formation of nanostructural units in the glassy matrix.

Prospects of Using Zeolite Rocks of Siberia in Silicate Materials

The results of integrated studies of zeolite rocks from the Sakhaptinskoe and Kholinskoe deposits are shown and the prospects of using clinoptilolite-bearing zeolite materials in mixed gypsum-zeolite, zeolite-magnesium, and lime-zeolite binders are determined.

Talc-based ceramic pigments

The results of a study of synthesis of ceramic pigments from talc are presented. The possibility is demonstrated for pigments to be made with the crystal structure of magnesium metasilicate and forsterite.

Polymorphism of magnesium metasilicate and its role in the production of nonaging steatite ceramics

As established by a DTA and high-temperature x-ray diffractometric study, the phase transition of high-temperature protoenstatite to clinoenstatite on cooling is related to the crystal size. Methods are proposed whereby it is possible to make thermally stable, nonaging steatite ceramics with the protoenstatite crystallized into extremely fine grains. In this way, nonaging steatite ceramics of improved service properties can be produced.

Production of ceramic pigments with diopside structure from TALC

The results of investigation of synthesis of ceramic pigments with diopside structure are presented. Two reactions of diopside production are considered. It is indicated that the use of natural talc mineral makes it possible to lower the expense of pigment production and expand the pigment color range.

Zeolites: Raw material for ceramic pigments

The possibilities of using natural zeolite for synthesizing ceramic pigments are investigated. The special features of isomorphism of bi- and trivalent cations in the zeolite lattice are analyzed. It is shown that it is possible to obtain pigments with the structure of anorthite and mullite using a zeolite structure with additives (alumina, wollastonite).

Use of Siberian mineral raw materials in the manufacture of self-glazing ceramic tile

It is shown to be possible to manufacture self-glazing ceramic tile of satisfactory quality from the mineral raw materials available in the Siberian region and the soda—alkali effluent from a local petrochemical plant.

Formation of crystalline phases in electroceramics of the system CaO−MgO−Al2O3−SiO2 (A review)

Characteristics are given for the chemical compounds which are contained in the CaO·Al2O3·2SiO2−CaO·SiO2−MgO·SiO2−SiO2 tetrahedron and constitute the main crystalline phase of a large group of electroceramics. It is shown to be possible to analyze natural magnesia-calcium silicates in a four-component system with allowance for the formation of chemical compounds. The use of diopside raw materials is substantiated and their advantages in the manufacture of electroceramics are assessed.

Physicochemical modeling of composition of foam glass-crystal materials

The principles of the choice of compositions applicable for the low-temperature granulate production lay the foundation of physicochemical modeling of the composition of foam glass-crystal material in Na2O-CaO-SiO2 and Na2O-Al2O3-SiO2 systems. The model composition of granulate should provide the amount of melt formed at the temperatures below 950°C, at least 75%. The amount of crystalline phase in granulate should not exceed 20%; this provides the viscosity of the system in the foaming range (800–850°C) at 103–106 Pa s. To achieve the given viscosity of melt, the foaming temperature should be increased up to 950°C. During the formation of the nanosized crystalline phase in interpore partition, the strength of the material amounts to 3 MPa. In the course of the foaming process of the crystallizing granulate, the amount of the crystalline phase achieves 50%; this provides the strength of the foam material up to 10 MPa.

Ceramic pigments with diopside and anorthite structures based on wollastonite

Ceramic pigments with the structures of diopside and anorthite are obtained from natural wollastonite. It is demonstrated that the reactions of synthesis of diopside structure occur in several stages with formation of intermediate products. Mineralizing additives are required for a more complete phase formation of the anorthite structure. The obtained pigments have a vivid color and can be used to decorate porcelain, faience, and majolica products.