Doklady Rossijskoj akademii nauk. Himiâ, nauki o materialah.
ISSN (print): 2686-9535
Media registration certificate: No. FS 77 - 77117 dated 06.11.2019
Founder: Russian Academy of Sciences
Editor-in-Chief Ananikov Valentin Pavlovich
Number of issues per year: 6
Indexation: RISC, CrossRef, White List (level 3)
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Vol 519, No 1 (2024)
CHEMICAL TECHNOLOGY
Feedstock Processing with Small Additives of Polymer Binder by Solid-Phase Technology
Abstract
In this paper we consider the possibility of obtaining compact blanks and products from a granular metal-polymer composite based on chromium-molybdenum steel with small additives of a polymer binder by solid-phase pressing. The mixture compaction and its compressibility are considered as non-stationary deformation processes that depends on the changing over time rheological behavior of the material. The kinetics of pressing a granular mixture into compact blanks in a special mold by loading at a constant deformation rate has been studied. Rheological curves of stress–strain dependences are obtained, the time of the onset of progressive stress increase is determined. Optimal parameters of the blanks compacting from the green mixture have been found. Thus, it makes possible to obtain products with minimal porosity, and the physical and mechanical parameters of compacts, such as porosity, compressive strength and microhardness, have been studied.
3-10
Fuzzy-Interval Model of Forest Biomass Changes under the Influence of Technogenic Chemical Pollutants under Conditions of Uncertainty
Abstract
An original fuzzy-interval model of forest biomass change processes under the influence of technogenic chemical pollution under conditions of uncertainty of forest biomass state parameters is proposed. It is distinguished by the use of virtual positive and negative forest biomass flows with fuzzy values of forest biomass density and consumption parameters under the influence of chemical pollution, as well as operations of transforming initial differential equations with uncertain variables into interval equations with triangular fuzzy numbers (TFN), which allows, under conditions of fuzzy information about the biomass state, to calculate the boundaries of the impact and buffer zones of ecological zoning of forest areas under the influence of chemical pollution.
11-16
PHYSICAL CHEMISTRY
Superhydrophobisation of Painted Surfaces to Improve Their Protective Properties and Impart New Functional Properties to Materials
Abstract
The method of superhydrophobization of the epoxy enamel layer based on the use of pulsed laser treatment and chemisorption of fluorinated silane on the textured enamel surface is proposed. It is shown that flexible control of laser irradiation parameters makes it possible to texture the enamel surface without overheating and subsequent destruction. Experimental studies have shown that the proposed superhydrophobic treatment can significantly improve the protective properties of enamel and impart it new functional properties, such as water-repellent properties with extreme contact and roll-off angles, increased resistance to both abrasive loads and surface stresses arising in the three-phase contact zone during water crystallization and ice melting.
17-24
Diffusion Model of Elastic Properties of Fiber Reinforced Plastic in Humidification Conditions
Abstract
In this paper, there is consideration of a model of the dependence of in-plane shear modulus of the carbon fiber reinforced plastics on the time spent in thermally humid conditions is considered. This study is based on the Academician V.M. Buznik’s ideas of the effect of molecular transformations in polymer matrix on their macroscopic properties. The moisture transfer kinetics and changes of the in-plane shear modulus of the carbon fiber reinforced plastics during drying and humidification at 60°C have been investigated. Fick’s second law was used to approximate the dependence of the shear modulus on time, because of the dependence of mechanical properties on moisture content, which is commonly modeling by this law.
25-31
Phase Equilibriums in the Ni–Mn–In–Sb System in the Absence of Melt
Abstract
By the method of topological modeling using concentration diagrams of the ternary systems Ni–Mn–In, Ni–Mn–Sb, Ni–In–Sb and Mn–In–Sb and fragmentary experimental data on phase equilibria involving Heusler intermetallics Ni2Mn1+x(In,Sb)1–x, an isobaric-isothermal subsolidus concentration diagram of the quaternary system Ni–Mn–In–Sb was constructed for the first time.
32-36