INFLUENCE OF AN ORGANIC ADDITIVE ON THE STRUCTURE OF AN AQUEOUS SODIUM SILICATE FILM ON THE SURFACE OF A REFRACTORY CHROMITE FILLER

Formation of the structure of a film of hydrous sodium silicate on the surface of a refractory chromite filler. Wastes of contact cleaning of oils were used as organic additives, which are calcium bentonite impregnated with oils. The structure of liquid glass films on the surface of a refractory filler, cured at a temperature of 180-400-600-900 ° C, is investigated, which is comparable to the temperature convective system of liquid glass molds and rods, as well as the temperature system of molds after pouring with hot metal.

TECHNOLOGY OF PLASMA METALLIZATION OF THE WOOD AND FIBROUS BOARD

the scientific and technological principles of metallization of products on the basis of wood with use of plasma high-temperature dispersion are developed. For the purpose of prevention of impact of the highest temperatures of a plasma stream on a front surface wood and fibrous board (fibreboard) an intermediate layer was put. The structure of an intermediate protective layer, the including mix of epoxy resin with refractory filler is developed. Operation of drawing a protective intermediate layer included several specially developed technological stages. For the subsequent metallization such non-ferrous metals as copper and aluminum in the form of a wire are used. Optimum parameters of plasma dusting of metals on a front surface of a fibreboard are determined The protective and decorative covering on the basis of non-ferrous metals had high aesthetic consumption and performance properties. The covering possessed the increased coefficient of diffusive reflection and high durability of coupling with a matrix. The dependence of influence of thickness of the raised dust metal covering on durability of coupling of a covering with a substrate is established. The developed technology of metallization of products from wood in comparison with traditional technologies, allows to lower significantly time of metallization and energy consumption and to increase competitiveness of products both on internal, and on external the markets.

REGULATING OF CAST CONSTRUCTIONS PROPERTIES BY INTENSIFYING HEAT EXCHANGE IN MOLD WITH GASIFIED PATTERN

The paper discusses ways to intensify the heat exchange of the casting in the mold of particulate filler. These methods include the supply of refrigerant to the mold, the dynamic and aerodynamic movement of the refractory filler around the casting. The examples of application of these methods to increase the local properties of cast iron cylinder block body are shown. Application of aerodynamic movement of molding material for aluminum castings has allowed to increase their mechanical properties in 1,3–1,6 times.

THE ROLE OF REFRACTORY FILLER IN THE PROCESSES OF STRUCTURAL FORMATION OF CORE MIXTURES

The results of research, computer simulation of the influence of the shape of the grain of sand on the formation of the strength of the core mixture are presented. An essential dependence of the strength of the core on the quality characteristics of the refractory filler is established.