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Hits: 17184
Possible defects and inconsistencies with the requirements of artistic and industrial glass products during fusing are considered, methods for eliminating defects and ways of restoring rejected products are proposed. An algorithm of actions has been developed for detecting various types of defects in artistic and industrial products and establishing the feasibility of their correction
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Hits: 17338
Comparative studies of the impregnation of high-strength and basalt fibers with epoxy binders with various hardeners of untreated and emulsion-treated film-formers have been carried out. The method of assessing the impregnation by the height of the capillary rise of the binder revealed differences in the surface treatment of high-strength and basalt fibers. The effect of surface treatment on the change in the strength of the tested filaments and microplastics based on them is estimated.
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Hits: 17432
Is this work devoted to one of the most important areas of energy and resource conservation in metallurgy? utilization of converter slag and, as a result, an increase in the resistance of the refractory lining. Studies are presented in which, based on the chemical composition of the slag of the Polish metallurgical plant, using the Riboud and Urbain models, the dynamic viscosity of the slag was determined in the temperature range from 1500 to 1650 ° C, as well as a comparative analysis with the results of the Fact Sage program. In addition, the results of a calculation are given, which allows, with a variable FeO content in the slag from 5 to 30%, to determine its effect on the viscosity of the slag.
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Hits: 17422
The porous structure of polymer and gypsum molds is analyzed. Models of their structure are proposed on the basis of the model of chaotically located spheres and the theory of percolation. The calculation expressions for evaluating the parameters of the porous structure are refined and the obtained structural parameters of the polymer and gypsum molds are given. Calculation results are presented.
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Hits: 17365
The composition and properties of clays of the Tyumen region have been investigated in order to be used in the production of ceramic aggregate? keramdor. It was found that the clays are acidic, have a montmorillonite composition, are medium-dispersed, highly sensitive to drying and non-caking. Recommendations for the use of sample clay have been developed? 1 for the manufacture of ceramdor used for the construction of highways
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Hits: 17745
A new method for the synthesis of yttrium-aluminum garnet powder Y3Al5O12 is proposed, which consists in the anion-exchange coprecipitation of yttrium and aluminum from chloride solutions with the Purolite
A-300 anionite in the OH-form and calcining the formed precursor at a temperature of 900 ° C. The product was studied by XRD, DSC, IR spectroscopy and electron microscopy. The particle size of the obtained Y3Al5O12 was 300 nm
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Hits: 17713
It was determined by X-ray phase and IR spectroscopic methods of analysis that the strength properties of ceramics, which served for more than 100 years in the buildings of the Catholic Church, the Iversky Monastery and the Nativity Church. In addition, the presence of isothermal pores and oval closed porosity in the studied brick samples of these buildings also contributes to an increase in durability.
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Hits: 17890
Considered is the production of a non-waste technology from simple and readily available substances and the use of an environmentally safe glassy metaphosphate composition (SFC) of patented compositions for the complex protection of elements of water heating systems from corrosion and salt deposition (scale). The results of experiments on the study of solubility, anti-corrosion and antiscale properties of SFC are presented.
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Hits: 18112
The results of processing measurements of the TLEC and relative elongation of borosilicate glasses of two grades are presented. LK5 and Borofloat 33. The thermomechanical analyzer TMA7100 was used to measure the elongation of glass samples in the temperature range from 130 to 800 K (from ?143 to +526 ° C). The relative error of indirect measurements of TCLE and relative thermal elongation of glasses of both grades does not exceed ?5 and ?3%, respectively. Polynomial equations are presented that approximate the obtained measurement results as a function of temperature. The results obtained will facilitate the tasks of modeling the characteristics of microsystem technology devices manufactured using the anodic fit of silicon on glass, and they can also be used to optimize the temperature regime of silicon-glass bonding.
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Hits: 18376
Provides general information about solid reinforcing materials and steels for rock cutting tools; some problems of efficiency and durability of sintered cermet hard alloys are shown. The possibility of replacing expensive wear-resistant alloys with economically alloyed white cast irons with an increase in mechanical properties, hardness, wear resistance and impact resistance of white cast iron due to the treatment of the melt with nitrogen and an increase in the carbon content is shown. Possible ways of improving the properties of sintered metal-ceramic alloys due to thermal and chemical-thermal treatment are briefly highlighted.
