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The processes occurring during the plasma-chemical synthesis of melts from quartz-feldspar-containing raw materials in order to obtain new building materials with increased operational properties are considered. The results of physicochemical studies of the initial quartz-feldspar-containing raw material and the melting product obtained from it are presented.
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A new composition of cermet solder for high pressure sodium lamps is proposed. This cermet solder is able to ensure the duration of the lamp with an increased specific electrical load up to 12,000 hours, as well as significantly improve the quality of the lamps produced and significantly expand their practical application.
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The results of studies of the processes of interaction of fiberglass used for dispersed reinforcement of concrete with cement stone are presented. It was found that the nature of the interaction depends on the chemical composition of the fiber, the composition of the cement and the conditions of concrete hardening. It is shown that for steamed concretes it is more expedient to use finely ground basalt glass powder instead of basalt fiber. In this case, the compressive strength of the cement stone can be increased up to 2 times.
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The materials of glass-melting vessels for glass melting produced by various manufacturers have been investigated. Based on the data of dilatometric analysis, optical and electron microscopy, conclusions were drawn about the causes of vascular destruction.
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Hits: 23204
The results of studies of the effect of a complex additive containing sodium tripolyphosphate and a resorcinolfurfural oligomer on the processes of wetting hard surfaces are presented. It is shown that the work of wetting an aluminum plate with solutions with a complex additive is significantly higher than the total work of wetting with solutions containing individual components of the complex. The investigated complex additive increases the wetting of the Al
2 O
3 surface, which contributes to a decrease in the free surface energy at the solid - solution interface.
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Current trends in the study of the fine structure of ?-Al
2 O
3 single crystal fibers obtained by pulling from the melt onto a seed (EFG) and by thinning a feeder using laser heating (LHPG) are presented. ). Studies of the crystallographic orientation of ?-Al
2 O
3 single crystal fibers have been carried out on an optical and scanning electron microscope. The use of X-ray diffraction topography for studying the perfection of the obtained single-crystal ?-Al
2 O
3 fibers and observing the boundaries of blocks and single dislocations is proposed.
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Studies have shown that mullite gives the main strength characteristics to the ceramic bricks of the Astrakhan Kremlin. Crystallization of mullite in the sample under study indicates that the brick firing temperature was not less than 1000 - 1050 ° C.
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The properties of glass fiber laminates based on inorganic aluminophosphate binders and glass fillers of various structures have been investigated. The mechanical and dielectric properties of STAF glass fiber laminates based on silica, glass and basalt fillers, as well as lightweight glass fiber laminates filled with microspheres are given. Glass fiber laminates based on an inorganic aluminophosphate binder can be used for the manufacture of structural and radio engineering products that operate for a long time at high temperatures.
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Hits: 23710
A review of synthesis methods and properties of phosphors based on yttrium aluminum garnets, activated with rare earth elements, for LED light sources is presented. The dependences of the spectral characteristics of luminophores on their compositions are presented.
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A method is proposed for the synthesis of a sol with a controlled particle size by influencing the parameters of the hydrolytic polycondensation process. The possibilities of sol synthesis by changing the mass, time and temperature parameters of the hydrolysis reaction of tetraethoxysilamine (TEOS), as well as a mixture of TEOS with the product of its partial hydrolysis, ethyl silicate-40 (ETS-40), in the presence of an electrophilic or nucleophilic catalyst were investigated. The size of the particles and the nature of their distribution in the synthesized samples were determined.
