INFLUENCE OF THE ARCHITECTURE AND ELEMENTAL-CHEMICAL COMPOSITION ON THE STRUCTURE AND PROPERTIES OF CARBONACEOUS COMPOSITE MATERIALS

Author(s):  
V. S. Terentieva ◽  
I. O. Leipunskii ◽  
A. I. Eremina ◽  
P. A. Pshechenkov ◽  
A. N. Astapov
2020 ◽  
Vol 12 ◽  
Author(s):  
Alexandra Atyaksheva ◽  
Yermek Sarsikeyev ◽  
Anastasia Atyaksheva ◽  
Olga Galtseva ◽  
Alexander Rogachev

Aims:: The main goals of this research are exploration of energy-efficient building materials when replacing natural materials with industrial waste and development of the theory and practice of obtaining light and ultra-light gravel materials based on mineral binders and waste dump ash and slag mixtures of hydraulic removal. Background.: Experimental data on the conditions of formation of gravel materials containing hollow aluminum and silica microsphere with opportunity of receipt of optimum structure and properties depending on humidity with the using of various binders are presented in this article. This article dwells on the scientific study of opportunity physical-mechanical properties of composite materials optimization are considered. Objective.: Composite material contains hollow aluminum and silica microsphere. Method.: The study is based on the application of the method of separation of power and heat engineering functions. The method is based on the use of the factor structure optimality, which takes into account the primary and secondary stress fields of the structural gravel material. This indicates the possibility of obtaining gravel material with the most uniform distribution of nano - and microparticles in the gravel material and the formation of stable matrices with minimization of stress concentrations. Experiments show that the thickness of the cement shell, which performs power functions, is directly related to the size of the raw granules. At the same time, the thickness of the cement crust, regardless of the type of binder, with increasing moisture content has a higher rate of formation for granules of larger diameter. Results.: The conditions for the formation of gravel composite materials containing a hollow aluminosilicate microsphere are studied. The optimal structure and properties of the gravel composite material were obtained. The dependence of the strength function on humidity and the type of binder has been investigated. The optimal size and shape of binary form of gravel material containing a hollow aluminosilicate microsphere with a minimum thickness of a cement shell and a maximum strength function was obtained. Conclusion.: Received structure allows to separate power and heat engineering functions in material and to minimize the content of the excited environment centers.


1995 ◽  
Vol 400 ◽  
Author(s):  
S. Vepřek ◽  
M. Haussmann ◽  
S. Reiprich

AbstractWe have developed a theoretical concept for the design of novel superhard materials and verified it experimentally on several systems nc-MenN/a-Si3N4 (nc-MenN is a nanocrystalline transition metal nitride imbedded in a thin amorphous Si3N4 matrix). Hardness in excess of 5000 kg/mm2 (about 50 GPa) and elastic modulus of ≥550 GPa have been achieved [1-3]. Here we address the questions of the universality of the concept for the design of a variety of nc/a systems and the upper limit of the hardness which may be achieved.


2019 ◽  
Vol 822 ◽  
pp. 404-409
Author(s):  
S.S. Silchonok ◽  
G.G. Zadykyan ◽  
Oleg G. Zotov ◽  
Iuliia N. Morozova

This article is devoted to Inconel 718 heat-resistant nickel alloy. Comparison of samples obtained by high-speed direct laser deposition technology of powders from different manufacturers on their structure and properties was carried out. The dependence of the influence of the chemical composition of the powders on the formation of defects in the studied samples was established


2020 ◽  
Vol 992 ◽  
pp. 336-340
Author(s):  
V.A. Gafarova ◽  
J. V. Bazrova ◽  
L.Z. Teltsova

Over the past fifteen years, Russian and foreign scientists have conducted a large amount of research in the development and use of composite materials based on epoxy resins, including the ways to restore structural integrity. In the oil and gas industry, composite materials are used for repair works.


2018 ◽  
Vol 23 (1) ◽  
pp. 27-31
Author(s):  
Jan Bujak ◽  
Paweł Hermanowicz

The paper presents the preliminary research results of the influence of the chemical composition of the two-component nitriding atmospheres on the structure and properties of the nitrided layers in the surfaces of the blind holes. The results showed that the utilization during the heating-up stage of in the controlled gas nitriding process the two-component atmospheres NH3 + NH3diss enables the production of the nitrided layers with a limited thickness of an iron nitrides layer as well as and a sufficiently high hardness on the surfaces of the blind holes. The nitrided layers obtained on the surfaces of the blind holes, depending on the position in the hole, show similar differentiation of the structures and properties, regardless of the dilution rate of ammonia in the atmospheres that were used during the heating-up stage. This differentiation is caused by the weak inflow of the fresh nitriding atmosphere to the interior of the blind holes due to their small diameters, which in turn is manifested as a gradual slowdown of the growth kinetics, a reduction of the thickness and hardness of a nitrided layer along with the increase in the depth of the blind holes.


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