The possibility of using silicate coatings as protective for bismuth-containing powder materials in order to expand their operational properties is considered. A method for pretreating the surface of powder steel for enameling by borating is proposed, which makes it possible to obtain high adhesion strength in the composition of the powder material - silicate coating. Bibliography: 6 titles.
Modeling of high-temperature processes occurring in oxide-silicate systems under the influence of plasma has been carried out. The studies were carried out using plasmatrons used in the practice of analytical chemistry in the implementation of atomic emission analysis. The choice of these sources is due to a simpler methodology for studying the interaction of plasma with the surface of a solid material. To clarify the identified high-temperature mechanisms, thermodynamic modeling was carried out using the "Astra" software package. Tab. 2, ill. 5, bibliography: 4 titles.
A thermodynamic analysis of parallel-sequential reactions taking place in complex oxide systems has been carried out. The use of the Karapetyants technique with the involvement of the improved Hook-Jeeves method made it possible to determine the optimal area of ??the investigated compositions and the most rational temperature range for heat treatment of coatings. This made it possible to significantly reduce the subsequent experimental part of the work and reduce it to checking the optimum found thermodynamically. Tab. 2, ill. 4, bibliography: 4 titles.
The conditions for chemical deposition of nickel on glass microspheres are determined. It is shown that nickel-plated glass microspheres can be used as a conductive filler of paints and varnishes to obtain coatings that effectively protect against EMP in the frequency range 0.15 - 1000 MHz. Tab. 1, ill. 3.
The diffusion processes occurring at the interface between willemite glass-crystalline glaze and quartz glass-ceramics during firing have been studied. The formation of a transitional contact zone between the glaze and quartz glass-ceramics was experimentally established, which ensures the formation of a strong adhesion of the coating to the substrate. Using the method of layer-by-layer etching and X-ray fluorescence analysis, the length of the contact zone and the concentration distribution of the components in it were determined. The coefficients of interdiffusion of potassium and silicon ions for glaze firing conditions have been calculated. Tab. 2, ill. 3, bibliography: 9 titles.
The technological properties of industrial compositions of enamels used for enameling of oil country tubular goods have been studied. The characteristics of the corrosion process of steel under a layer of enamel coating are given, with the help of which it is possible to optimize the process of its firing. Tab. 3, bibliography: 2 titles.
Compositions and properties of glass coatings intended for steel protection at hot deformation temperatures are given. Up to 75% of coal ash - waste from thermal power plants - was added to the glass coatings. The oxidation rates of 08kp steel under the layer of the proposed coatings and in air have been determined. Tab. 2, bibliography: 3 titles.
The effect of the duration of surface treatment of lime-alkali silicate glass in a melt of potassium and lead nitrates at a temperature of 460 ° C on chemical resistance and mechanical strength has been investigated. It is shown that the formation of a crystalline lead-silicate coating during processing makes it possible to increase by 3 times the alkali resistance and 2 times the mechanical strength of glass. Practical recommendations are given. Il. 4, bibliography: 7 titles.
It has been established that the technological conditions for the formation of the optimal macrostructure of a self-cleaning coating depend on the sintering interval of the glass bond and its dispersion. The most porous coating with a maximum self-cleaning coefficient of 96 - 98% was obtained by introducing 12 - 14 hours by weight of sodium water glass into the coating slip. The optimal structure of the coating ensures the decomposition of edible fats after repeated thermal cycling. Tab. 2, ill. 3, bibliography: 2 titles.
Compositions based on feldspar raw materials and hydroxyapatite with fluorite additives, suitable for the manufacture of ceramic coating of dentures with good masking properties and dimensional stability, have been developed. The mechanism of formation of coatings and their physicochemical properties have been investigated. Tab. 5, ill. 2, bibliography: 4 titles.
