Synthesis of Cast Composite Materials by SHS Metallurgy Methods

2017 ◽  
Vol 746 ◽  
pp. 219-232 ◽  
Author(s):  
V.I. Yukhvid ◽  
D.E. Andreev ◽  
Vladimir N. Sanin ◽  
Vladimir A. Gorshkov ◽  
M.I. Alymov
Keyword(s):  
Composite Materials ◽  
Intermetallic Compounds ◽  
Material Structure ◽  
Hard Alloys ◽  
Practical Application ◽  
Main Attention ◽  
Cast Composite ◽  
Shs Metallurgy ◽  
Niobium Silicides ◽  
Process Material

The review of the results obtained by the authors in synthesis of cast composite materials by the methods of SHS metallurgy is made. The main attention is paid to synthesis of heat-resistant materials based on intermetallic compounds of nickel and titanium and niobium silicides as well as tungsten-free hard alloys based on titanium and chromium carbides. The parameters allowing one to govern the process, material structure and composition were determined. Practical application was specified.

scholarly journals Place of piracetam in the modern practice of medicine

2017 ◽  
Vol 15 (1) ◽  
pp. 14-25 ◽  
Author(s):  
Victor V Vostrikov
Keyword(s):  
Clinical Medicine ◽  
Evidence Based ◽  
Clinical Effects ◽  
Practical Application ◽  
Main Attention ◽  
Dependent Relation ◽  
Practice Of Medicine ◽  
High Doses ◽  
Based Medicine ◽  
Dose Dependent

The review considers the stages of experimental and clinical study of piracetam in the framework of evidence-based medicine, its wide practical application in various fields of clinical medicine. The main attention pays to the mechanisms of action of the drug, its properties and physiological effects. The specific dose-dependent relation is revealed for the clinical effects of piracetam: the efficiency grows higher dependent on high doses and prolongation of courses.

High-loaded sub-6 nm Pt1Co1 intermetallic compounds with high-efficient performance expression in PEMFCs

2021 ◽  
Author(s):  
Qingqing Cheng ◽  
Shuai Yang ◽  
Cehuang Fu ◽  
Liang-Liang Zou ◽  
Zhi-Qing Zou ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Intermetallic Compounds ◽  
High Performance ◽  
Reduction Reaction ◽  
Operating Conditions ◽  
Practical Application ◽  
Efficient Performance ◽  
High Efficient ◽  
High Metal

High-loaded oxygen reduction reaction (ORR) Pt intermetallic compounds with high performance expression under PEMFC operating conditions are prerequisite for practical application. Nevertheless, high metal-loading would lead to the severe agglomeration...

scholarly journals Synthesis of composite materials on cobalt and nickel bases via centrifugal SHS-metallurgy

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 107-110
Author(s):  
K. V. Zakharov ◽  
◽  
D. E. Andreev ◽  
V. I. Yukhvid ◽  
N. Yu. Khomenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Modern Technology ◽  
Chemical Transformations ◽  
Shs Metallurgy ◽  
Centrifugal Shs ◽  
Combustion Processes ◽  
Synthesized Materials ◽  
Cobalt And Nickel

This paper discusses the synthesis regularities of new composite materials via combustion processes and their features of physicochemical transformations for task of a modern technology. In early studies, the authors showed the possibility of synthesizing composite materials via centrifugal SHS metallurgy, in which the combustion of thermite mixtures and the chemical transformations were studied. The compositions, structures and mechanical properties of the synthesized materials were also investigated

scholarly journals Calciothermic powders of rare metals and intermetallic compounds

2020 ◽  
pp. 31-50
Author(s):  
A. V. Kasimtsev ◽  
S. N. Yudin ◽  
Yu. V. Levinsky
Keyword(s):  
Composite Materials ◽  
Intermetallic Compounds ◽  
Raw Materials ◽  
Synthesis Method ◽  
Reduction Process ◽  
Calcium Carbide ◽  
Calcium Hydride ◽  
Rare Metals ◽  
Technical Literature ◽  
Calciothermic Reduction

This paper presents a profound review of scientific and technical literature on the issues of calciothermic production of powders of rare metals, intermetallic compounds, composite materials and refractory oxygen-free compounds (carbides, nitrides). Calciothermic reduction is a metallothermic synthesis method for those substances where calcium or its derivatives, such as calcium hydride or calcium carbide, are used as a reducing agent. Thermodynamics aspects of a reduction process are covered in the paper broadly, with particular emphasis on assessing the reduction depth of original oxide raw materials, as TiO2. The mechanism and kinetics of calciothermic synthesis of single-component and multi-component alloys are described. Presented are both technological means of obtaining materials and hardware resources of many varieties of calciothermic method. The key features of the work are generalization and systematization of properties (chemical, physical, technological) of materials synthesized by calciothermic method. The data are accumulated in the appropriate tables and divided by substance classes (powders of metals and alloys, powders of intermetallic compounds, powders of carbides, powders of nitrides, and powders of composite materials). Methods of calciothermic powder making in case of the singlecomponent and complex multi-component systems are briefly described. This work will be interesting to the students of metallurgical profile and specialists whose scientific interests are in the field of material synthesis by methods of powder metallurgy.

scholarly journals Experimental investigation of CFRP fracture toughness by delamination type

2021 ◽  
Vol 20 (1) ◽  
pp. 97-108
Author(s):  
S. A. Chernyakin
Keyword(s):  
Fracture Toughness ◽  
Experimental Investigation ◽  
Composite Materials ◽  
Numerical Models ◽  
Optical Microscope ◽  
Fracture Mechanisms ◽  
Material Structure ◽  
Propagation Process ◽  
Reinforced Plastics ◽  
Delamination Propagation

The results of analyzing fracture toughness in carbon fiber-reinforced plastics by the type of delamination are presented in the article. The goal of this paper is investigation of delamination propagation process and fracture mechanics parameters in modern CFRPs. This type of composite materials is extensively used in high load aerospace structures. Modern polymer composite materials are the subject of our research. A technique of manufacturing specimens for testing by the vacuum infusion process is presented in the paper. Experimental investigation of delamination propagation process by mode I and II was performed with the aid of up-to-date testing equipment using a special type of specimens such as a double cantilever beam. Researchers usually use this type of specimen for the validation of their numerical models. Critical values of energy release rate and load-displacement curves were obtained for two types of material unidirectional and woven. Examination of microscopic sections of the tested specimens using an optical microscope allowed us to identify the specific fracture mechanisms of material structure.

scholarly journals Practical application of thermal analysis in the development and study of polymer composites

2019 ◽  
pp. 25-27
Author(s):  
N. V. Antyufeeva, ◽  
A. V. Slavin ◽  
V. A. Bolshakov
Keyword(s):  
Experimental Data ◽  
Thermal Analysis ◽  
Quality Control ◽  
Composite Materials ◽  
Polymer Composites ◽  
Applied Research ◽  
Materials Science ◽  
Technological Properties ◽  
Practical Application ◽  
Manufacturing Enterprises

Modern multifunctional thermoanalytical complexes equipped with computers are inherently mobile laboratories. They are able to solve a wide variety of problems in materials science and technology, both in applied research and in the quality control of products supplied to manufacturing enterprises. Using the example of experimental data obtained in the study of the curing processes of thermosetting semi-finished products (prepregs) of polymer composite materials (PCM), the methodological possibilities of modern devices for thermal analysis are shown. They allow investigating and predicting changes in the technological properties of prepregs in a wide temperature range.

scholarly journals Composite Material Damage Processes

2020 ◽  
Vol 3 (3) ◽  
pp. 307-323
Author(s):  
Davor Bolf ◽  
Albert Zamarin ◽  
Robert Basan
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Material Structure ◽  
Material Damage ◽  
Shipbuilding Industry ◽  
Vast Number ◽  
Damage And Fracture ◽  
Control Procedures ◽  
Material Fracture ◽  
Damage Processes

Composite materials are in use in the shipbuilding industry for a long period of time. Composites appear in vast number of fibre – matrix combinations and can be produced with several different production processes. Due to the specific nature of the composite material structure, the selection of the production process and the limitations in the quality control procedures, composite materials will always be subject to defects and imperfections which may, under certain circumstances, lead to the appearance and propagation of cracks. The size and the shape of the crack, the load type and the stress field in the material surrounding the crack will be crucial for crack growth and crack propagation. This paper reviews the composite material damage processes especially relevant for shipbuilding. The basic principles of composite material fracture mechanics are briefly explained, and finally, mechanisms responsible for the development of damage and fracture of composite materials are presented. This paper has emerged from the need to summarize information about composite material fracture and failure mechanisms and modes relevant for the shipbuilding industry.

scholarly journals Assessment of influence of disperse filler polarity on structure and water absorption of epoxy compositions

Vestnik MGSU ◽  
2019 ◽  
pp. 690-699 ◽  
Author(s):  
Irina A. Kotlyarova ◽  
Irina V. Stepina ◽  
Dmitry A. Ilyushkin ◽  
Igor S. Tsvetkov
Keyword(s):  
Hydrogen Bond ◽  
Composite Materials ◽  
Ir Spectroscopy ◽  
Water Absorption ◽  
State Standard ◽  
State Standard Gost ◽  
Water Resistance ◽  
Epoxy Binder ◽  
Material Structure ◽  
Disperse Fillers

Introduction. Composite materials on the basis of epoxy resin find wide application as adhesives, coatings and structural materials whose properties it is possible to regulate by introduction of various additives including disperse fillers in the epoxy binder. Positively influencing properties of epoxy materials, the disperse fillers can reduce water resistance of the materials. This work is aimed at studying of influence of polar and nonpolar disperse fillers on structure and water absorption of the epoxy materials. Materials and methods. When obtaining composite materials, the following components were used: ED-20 epoxy resin (state standard GOST 10587-84), dibutylphthalate (state standard GOST 8728-88) plasticizer, polyethylenepolyamine (specification TU 2413-357-00203447-99) hardener, marshallite (state standard GOST 9077-82) and graphite (state standard GOST 17022-81) disperse fillers. The structure of samples was investigated by means of IR-spectroscopy method. Water absorption was determined in boiling water using the standard gravimetric method (state standard GOST 4650-2014 (ISO 62:2008)) and evaluated by sample mass variation within 120 days. Results. As a result of the conducted researches, the optimum content of the marshallite and graphite fillers in epoxy materials is established. When mass filler-to-binder ratio is equal to 15/85, water absorption of the materials is minimum. The IR-spectroscopy method showed that introduction of the marshallite polar filler in the epoxy binder promotes ordering of material structure due to formation of hydrogen bond between reactive groups of the filler and resin. Localizing in amorphous areas, particles of the graphite nonpolar filler lead to weakening of the hydrogen-bond system. Interaction of marshallite-filled samples with water is accomplished at the swelling mode, with equilibrium degree of swelling about 1 %. The mechanism of interaction of graphite-filled samples with water includes the alternating stages of dissolution and swelling, which are more expressed as compared with check samples. Conclusions. Water resistance of epoxy materials filled with disperse fillers is defined by a microstructure of the cured resin. Introduction of the marshallite polar filler in the epoxy binder leads to ordering of material structure that results in increasing of water absorption. Introduction of the graphite nonpolar filler in the epoxy binder leads to disordering of material structure that results in reducing of water absorption. Lower value of water absorption of graphite-filled epoxy material is connected with partial dissolution of the sample. Using nonpolar fillers is inexpedient for epoxy materials contacting with water.

scholarly journals Tissue dermal equivalent – а cellular product based on human dermal keratinocytes and fibroblasts: the properties of equivalent components and perspectives of practical application

2021 ◽  
Vol 66 (4) ◽  
pp. 391-401
Author(s):  
A. V. Butenka ◽  
Z. B. Kvacheva ◽  
I. B. Vasilevich ◽  
A. Ch. Chasnoit ◽  
I. D. Volotovski
Keyword(s):  
Practical Application ◽  
Main Attention ◽  
Dermal Equivalent ◽  
Cell Biomass ◽  
Dermal Cell ◽  
Proliferation Activity ◽  
Cultivation In Vitro ◽  
Cellular Components ◽  
Selection Of

The nature and ways of isolation and cultivation in vitro of keratinocytes and fibroblasts, the main cellular components of skin to prepare a new biomedical product, tissue dermal equivalent were considered. The main attention was payed to optimization of upbuilding dermal cell biomass including selection of medium compositions and conditions of cultivation. The information was given on main parameters of cell cultures as proliferation activity, viability and phenotype of the cells. Genotoxicity of fibroblasts and biocompatibility of the cells with organic matrixes to find the optimal carrier for cellular elements of tissue dermal equivalent were studied. The composition, the process of preparation of tissue dermal equivalent and perspectives of its practical application were discussed.

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