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A. V. Laptev 《Powder Metallurgy and Metal Ceramics》2007,46(11-12):517-524
The mechanical properties of hard WC-Co alloys produced by solid-phase sintering at various temperatures are discussed. It is shown that the bending strength and hardness of these alloys may be the same as those achieved in liquid-phase sintering. The difference between solid-phase and liquid-phase sintering is only in the time it takes to achieve the dense state. Excellent mechanical properties at rather low temperatures (1150–1200 °C) can be obtained by sintering under pressure. High hardness can be achieved at 1000–1100 °C by hot isostatic pressing of nanoscale powders. The excellent mechanical properties of solid-phase-sintered hard WC-Co alloys indicate that strong interphase and intercarbide boundaries occur earlier than the liquid phase. 相似文献
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V.A. Barachevsky A.A. KhodonovA.V. Laptev A.Yu. LukinO.V. Demina S.I. LuyksaarM.M. Krayushkin 《Dyes and Pigments》2012,92(2):831-837
In the present review, we summarize our recent studies on the synthesis and spectral-kinetic parameters of photochromic retinals based on spiropyrans, diarylethenes, and a fulgimide and the use of these compounds for the preparation of artificial analogs of natural bacteriorhodopsin. 相似文献
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A. S. Anikeev I. V. Blinkov V. V. Ivanov A. I. Laptev V. S. Chelnokov I. Yu. Kuchina 《Russian Journal of Non-Ferrous Metals》2017,58(4):449-455
Samples of Al2O3–TiO2 coatings are fabricated by the flame spraying of a flexible cord. The influence of process parameters and composition of the sprayed material on the structure, composition, and mechanical properties of coatings is investigated. It is shown that an increase in the spraying distance and feed rate of the sprayed material leads to a decrease in their density. An increase in the concentration of the low-melting TiO2 component predetermines a decrease in the coating porosity and has no significant effect on the coating hardness. Being subjected to measuring scratching, Al2O3–TiO2 flame coatings formed with minimal porosity (Π = 3.2%) are characterized by cohesion fracture behavior and no substrate opening under an indenter load of up to 90 N. The friction factor of coatings under study varies from 0.2 to 0.78 after 2800 counterbody revolutions (44 m of the friction path). This is associated with the accumulation of fatigue cracks in the coating material and its subsequent cohesive fracture by the formation of large fragments serving as an abrasive. 相似文献
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A mathematical model of the process of rectification of a multicomponent mixture on a bubble plate is presented. The transfer processes in the twophase gas–liquid flow are described using a twoliquid model with account for the distinctive features of the phase interaction on the plate. The results of calculations according to the Young model are compared to the experimental data on the rectification of an nhexane–ethanol–methylcyclopentane–benzene mixture on a sieve plate 0.302 m in diameter. 相似文献
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