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Hits: 7249
By the method of self-propagating high-temperature synthesis (SHS) with preliminary mechanical activation treatment (MA), a cermet material was obtained based on the Ni? Al? SiO
2 system with different mass content of the SiO
2 mixture (0? 50 & # 37;). It is shown that the preliminary mechanical activation treatment of the powder mixture strongly affects the morphology of the final product. Depending on the composition of the initial mixture, the phases NiAl, Al
2 O
3 , Ni
2 Si, and NiSi
2
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Hits: 7442
The results of tests in laboratory and production conditions of the developed heat-resistant sitall coatings for the protection of expensive nichrome alloys based on technogenic raw materials are presented. The results of the economic efficiency of the application of the developed heat-resistant sitall coatings with the use of secondary raw materials during the operation of coatings at high temperatures are presented.
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Hits: 8065
Thermal analysis was used to study the behavior of various cobalt oxides (CoO, Co
2 O
3 and Co
3 O
4 ) when heated. At 200 - 850 & # 176; C Co
2 O
3 gradually passed into Co
3 O
4 , which at & # 8776; 920 & # 176; С turned into CoO. The effect of mechanical treatment in a planetary and ball-ring mill on the yield of CoAl
2 O
4 spinel and the size of its crystallites at different temperatures is analyzed. The effect of MgO and ZnO additives on the size of pigment particles and color is estimated. The synthesized compounds were tested as pigments introduced into engobe, glaze, underglaze and overglaze paint using several ceramic masses
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Hits: 8607
Samples of electrodes with an active layer based on TiO
2 , RuO
2 , IrO
2 and oxides of rare earth elements Ce, La, Nd, Pr, Gd and others. Studied their electrochemical behavior. The values ??of the values ??of the current-free potentials have been determined. The dependences of the rate of the anodic processes of chlorine and oxygen evolution on the composition of the electrode and the effect of the temperature regime of processing the finishing layer on the electrochemical characteristics are presented.
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Hits: 8581
The study of the temperature regime of glass coating deposition on the inner surface of the heat exchanger tube has been carried out. The choice of the temperature regime for coating the pipe depends on the physical and mechanical properties, geometric dimensions and temperature distribution at any points of the coating and the metal part of the heat exchange pipe. The regularities of the change in the temperature field of the deposition of glass coatings on the inner surface of the pipe depending on the heating time of the electric heating furnace are obtained theoretically. It was found that the temperature when applying a glass coating on the inner surface of the pipe mainly depends on the brand and thickness of the glass sealed rod.
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Hits: 9178
The creation of reaction-cured coatings is a promising direction in the field of protection of metallic and non-metallic structural materials during operation in aviation technology. The main feature of these coatings is the possibility of their formation (firing) at temperatures close to operating temperatures, while increasing their temperature resistance.
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Hits: 9356
A study of pigments and binders was carried out to obtain a radiation-resistant thermoregulatory coating (TRP) for spacecraft. On the basis of the selected components, a radiation-resistant thermo-regulating coating was obtained. Based on the results of ground tests, an assessment of the resistance of the coating was carried out during operation in the geostationary orbit (GSO) for 15 years. Comparative characteristics of white heat distribution devices (based on BaSO
4 ), which are currently most used in Russia, are presented.
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Hits: 9753
The possibility of a significant increase in the tribological characteristics of structural steels under various friction conditions by applying a layer of composite chemical coatings with a nickel-phosphorus alloy with inclusions of dispersed particles of oxides of chromium, aluminum, titanium, zirconium, boron carbide, titanium nitride, diamond, and copper phthalocyaninate is shown. The influence of the nature, size and content of dispersed particles in composite coatings on the wear resistance of a tribocontact is investigated. The optimal conditions for the deposition of composite coatings with increased wear resistance have been determined.
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Hits: 11361
In SRC & # 171; Kurchatov Institute & # 187; - TsNII KM & # 171; Prometheus & # 187; a new approach to the creation of porous functional ceramic coatings on the steel surface is proposed due to the integrated use of the methods of low-temperature heterophase transfer and microarc oxidation. The adhesion of the coating to the metal is at least 60 MPa. The intermediate layer of the coating contains intermetallic compounds of the nickel - aluminum system and provides the mechanical strength of the coatings during operation at temperatures above 750 ° C. The possibility of deposition of catalytically active substances with promoters on the surface of porous coatings from solutions of their salts or hydroxides with subsequent decomposition as a result of heat treatment is shown, as well as the possibility of deposition of metals into the pores of the MAO coating by the example of nickel.
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Hits: 11481
The results of the analysis of research in the field of developing compositions and methods of applying high-temperature coatings for the protection of various metals and alloys are presented. The relevance of further developments of heat-resistant sitall coatings for the protection of nichrome steels and alloys during their operation at high temperatures is shown.
