scholarly journals Synthesis and properties of composite material "Mo2C — carbon fiber"

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 159-163
Author(s):  
S. O. Luneva ◽  
◽  
V. S. Dolmatov ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Cyclic Voltammetry ◽  
Composite Material ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Electrocatalytic Activity ◽  
Hydrogen Peroxide Solution ◽  
H2o2 Solution ◽  
Low Activity

Molybdenum semicarbide Mo2C was synthesized on carbon fibers Carbopon-B-22 by the method of currentless transfer in molten NaCl-KCl-Na2MoO4-Mo salts. The electrocatalytic activity of the Mo2C/C composite material in a hydrogen peroxide solution has been investigated. It was revealed that this composite material is catalytically inactive in an H2O2 solution. The electrocatalytic activity of composite materials Mo2C/C, TaC/C, NbC/C and uncoated carbon fiber in the decomposition of hydrogen peroxide is compared. The method of cyclic voltammetry confirmed the low activity of Mo2C/C in comparison with other composites.

scholarly journals Prospects for the Use of Secondary Carbon Fibers

2020 ◽  
Vol 6 (3) ◽  
pp. 39-43
Author(s):  
G. Shaidurova ◽  
E. Gatina ◽  
Ya. Shevyakov
Keyword(s):  
Composite Material ◽  
Life Cycle ◽  
High Temperature ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Polymer Composite ◽  
Carbon Fibers ◽  
Polymer Composite Material ◽  
Physicomechanical Characteristics ◽  
Secondary Carbon

The results of studies on the possibility of using secondary carbon fiber extracted from the volume of spent polymer composite material by high-temperature pyrolysis for reinforcing chipboards are reflected. Studies were conducted on the physicomechanical characteristics of reinforced slabs, which showed a significant increase in performance. The results obtained make it possible to assess the possibility of the promising use of secondary fibers, which will provide a solution to the problem of completing the life cycle of polymer composite materials.

IN-SITU MEASUREMENT OF PERMEABILITY BETWEEN CARBON FIBER/RESIN

2021 ◽  
Author(s):  
MASAKI ENDO ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Capital Investment ◽  
High Strength ◽  
Carbon Fiber Reinforced Plastic ◽  
Manufacturing Costs ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Carbon fiber reinforced plastic (CFRP) is a composite material in which carbon fibers are impregnated with resin to achieve both high strength and high rigidity. CFRP is an excellent material, but it is expensive in terms of materials, manufacturing costs, and capital investment, and it takes a lot of time to complete a product. In order to solve these problems, the demand for de-autoclaving has been increasing in recent years. If molding can be performed without autoclaving, it will be possible to reduce costs and improve productivity in terms of materials and capital investment costs.

scholarly journals Composite Materials and Their Fiber Reinforcement Technology in Aerospace Field

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Kailin Zhou
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Research And Development ◽  
Carbon Fibers ◽  
Fiber Reinforcement ◽  
Space Structures ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
Composites Materials ◽  
Definition Of

The need to reduce the overall weight of aeronautical and space structures while preserving or even improving their performances make the research and development in the field of advanced composite materials necessary for the advancement of aerospace technologies. This paper provides an overview of composite materials and their fiber reinforcement technology in aerospace field. We discuss the reasons for aircraft manufacturers and airlines to use composites and illustrate the definition of composite material. Then, we list the advantages and disadvantage of composite materials and cite different fiber reinforcement technologies of carbon fibers, aramid fiber, UHMWPE, etc. At last, we summarize the present and future applications of composites materials in aerospace and other civil fields. A conclusion is drawn that in the future, composite materials are set for their development, while continually decreasing its costs is still an important task.

Friction and Wearing Behaviour of Sintered Composites Made from Copper Mixed with Carbon Fibers

2015 ◽  
Vol 660 ◽  
pp. 81-85 ◽  
Author(s):  
Radu Caliman
Keyword(s):  
Thermal Conductivity ◽  
Thermal Expansion ◽  
Composite Materials ◽  
Friction Coefficient ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Coefficient Of Thermal Expansion ◽  
Density Ratio ◽  
Point Of View ◽  
Short Carbon

This paper presents a study regarding friction and wear comportment of sintered composite materials obtained by mixture of copper with short carbon fibers. Sintered composites are gaining importance because the reinforcement serves to reduce the coefficient of thermal expansion and increase the strength and modulus. In case of composites form by carbon fiber and copper, the thermal conductivity can also be enhanced. The combination of low thermal expansion and high thermal conductivity makes them very attractive for electronic packaging. Besides good thermal properties, their low density makes them particularly desirable for aerospace electronics and orbiting space structures. Compared to the metal itself, a carbon fiber-copper composite is characterized by a higher strength-to-density ratio, a higher modulus-to-density ratio, better fatigue resistance, better high-temperature mechanical properties and better wear resistance. Varying the percentage of short carbon fibers from 7,8% to 2,4%, and the percentage of copper from 92,2% to 97,6%, five dissimilar composite materials have been made and tested from the wear point of view. Friction tests are carried out, at room temperature, in dry conditions, on a pin-on-disc machine. The friction coefficient was measured using abrasive discs made from steel 4340 having the average hardness of 40 HRC, and sliding velocity of 0,6 m/sec. The primary goal of this study work it was to distinguish a mixture of materials with enhanced friction and wearing behaviour. The load applied on the specimen during the tests, is playing a very important role regarding friction coefficient and also the wearing speed.

Preparation of the Carbon Fiber/Cu Alloy Matrix Self-Lubricating Composite Materials

2014 ◽  
Vol 670-671 ◽  
pp. 164-167 ◽  
Author(s):  
Sui Yuan Chen ◽  
Xin Rong Li ◽  
Yu Ning Bi ◽  
Daniel Wellburn ◽  
Jing Liang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Matrix Alloy ◽  
Copper Matrix ◽  
Wear Properties ◽  
Alloy Matrix ◽  
Coated Carbon

Using 663-tin bronze, Ni, W, nanoAl2O3, MoS2, graphite, CaF2, and Ni coated graphite as the matrix alloy powder, in which copper-coated carbon fiber of 5%, 7%, 9%, 11% and 13% in volume fraction were added as the reinforcing phase, a novel type carbon fiber/copper-matrix self-lubricating composite materials was prepared by means of powder metallurgy. The results indicate that the mechanical properties of the composite materials are improved after adding copper-coated carbon fibers. The composite materials reach optimal overall mechanical performance under testing when the volume fraction of the added copper-coated carbon fibers is 11%.: with a hardness of 57.8 HV and a compressive strength of 222 MPa. The addition of carbon fiber also improved the friction and wear properties of the composite materials. Increasing the volume fraction of fiber, was found to increase the wear resistance and improve self-lubricating performance. A volume fraction of 11% gave a friction coefficient of 0.09 and abrasion loss of 4mg.

Research on Composite Materials Used for Brake Shoes Manufacture

2016 ◽  
Vol 254 ◽  
pp. 207-211 ◽  
Author(s):  
Erika Popa ◽  
Liviu Pascu ◽  
Ana Socalici ◽  
Marius Ardelean
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Contact Zone ◽  
Laboratory Experiments ◽  
Rolling Stock ◽  
Brake Shoe ◽  
Materials Used

The paper relates laboratory experiments in order to obtain a composite material used for brake shoe manufacture. Regarding the testing materials were processed 38 samples. The percentage and composition of materials are: 15-45% novolac, 1,5-10% hexametyltetramin, 0-8% sulfur, 0-15% carbon fiber, 0-20% graphite, 0-25% aluminum, 15-28% brass and 0-40% rubber. The evolution of tribological and temperature parameters were analyzed in the contact zone tribological testing disk - split pin method. The composite material has the role to replace the classic material (cast iron) used in brake shoes composition in order to reduce the noise caused by rolling stock.

Electrochemical Preparation and Characterization of a Pt � Polytyramine Composite Material with Electrocatalytic Properties

2009 ◽  
Vol 59 (12) ◽  
Author(s):  
Tanta Spataru ◽  
Maria Marcu ◽  
Alexandra Banu ◽  
Eugen Roman ◽  
Nicolae Spataru
Keyword(s):  
Cyclic Voltammetry ◽  
Composite Material ◽  
Methanol Oxidation ◽  
Electrochemical Deposition ◽  
Electrocatalytic Activity ◽  
Polymer Coatings ◽  
High Porosity ◽  
Acidic Media ◽  
Electrochemical Preparation

Electrochemical deposition of polytyramine (PTy) was performed by cyclic voltammetry and it was observed that, in acidic media, 20 to 50 consecutive deposition cycles allowed us to obtain polymer coatings with good conductivity and high porosity. The polytyramine layers were used as a matrix for electrochemical deposition of platinum and the electrocatalytic activity for methanol oxidation of the composite material thus obtained was put in evidence.

Advanced Conductive Composite Materials for Spacecraft Application

2010 ◽  
Vol 123-125 ◽  
pp. 7-10
Author(s):  
Ho Sung Lee
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
Composite Materials ◽  
Carbon Fiber ◽  
High Performance ◽  
Thermal Stresses ◽  
Thermal Design ◽  
High Thermal Conductivity ◽  
Carbon Fiber Composites ◽  
Advanced Composite

In this study, thermal responses of advanced fiber/epoxy matrix composite materials are considered for spacecraft thermal design. These thermal responses are important, because the localized thermal behavior from applied heat loads can induce thermal stresses, which can lead to functional failure of the spacecraft system. Since most of polymer matrices exhibit relatively poor thermal conductivity, the composite materials have been widely considered only for structural application and little for thermal application. However, recently pitch-based high performance carbon fiber becomes available and this fiber shows high thermal conductivity. Because of this combination of low CTE and high thermal conductivity, continuous carbon fiber composites make them suitable for thermal management of spacecraft. The advanced composite material is composed of a continuous high modulus pitch based fiber (YS90A) and DGEBA epoxy resin(RS3232). It was demonstrated that advanced composite material satisfied thermal requirement for a lightweight thermal radiator for heat rejection of communication satellite.

Stress Analysis of Isotropic Material Flywheel Battery Rotor

2014 ◽  
Vol 532 ◽  
pp. 519-523
Author(s):  
Shuang Qing Tang ◽  
Xing Xia
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Stress Analysis ◽  
Isotropic Material ◽  
Manufacturing Cost ◽  
Metal Material ◽  
Metal Materials ◽  
Flywheel Rotor

The strength of metal materials is far less than the new composite material, such as carbon fiber. However, the price of the metal material and manufacturing cost are much lower than composite materials, which makes isotropic material much more practical for flywheel rotor. Through the stress analysis of isotropic material rotor, we can optimize the parameters of the rotor, thus for isotropic material provides the basis for the design of the rotor for flywheel battery.

scholarly journals Adsorption of acetaldehyde from air by activated carbon and carbon fibers

2021 ◽  
Vol 27 (2) ◽  
pp. 200549-0
Author(s):  
Soohyung Park ◽  
Muhammad Yaqub ◽  
Seunghan Lee ◽  
Wontae Lee
Keyword(s):  
Composite Material ◽  
Activated Carbon ◽  
Composite Materials ◽  
Carbon Fibers ◽  
Selective Absorption ◽  
Activated Carbon Fibers ◽  
Adsorption Efficiency ◽  
Dry Conditions ◽  
Dry And Wet Conditions ◽  
Coated Carbon

The adsorption of acetaldehyde from air using various activated carbon and carbon fibers was investigated in this study. These adsorbents included activated carbon (AC), carbon fibers (CFs), activated carbon fibers (ACFs), and metal-coated carbon fibers (MCCFs) supplied by different manufacturers. AC was categorized as AC1, AC2, AC3, and AC4, CFs were denoted as ACF1, while ACFs and MCCFs were expressed as ACF2 and ACF3, respectively. Five composite materials were prepared using the AC and ACFs in different ratios, and experiments were conducted to assess their acetaldehyde adsorption efficiency under dry and wet conditions. The results showed that the acetaldehyde adsorption efficiency of an impregnated AC4 was higher (95.9%) than that of both non-impregnated AC1 and AC3 and an impregnated AC2 after 1 min of operation. ACF2 showed a higher acetaldehyde adsorption efficiency (50.9%) as compared to ACF1 and ACF3 because of its larger surface area and selective absorption capability after 1 min of operation. A composite material comprising 6.3 g of AC4 and 1 g of ACF2 showed the highest adsorption efficiency of 97.9% under dry conditions. However, this adsorption efficiency significantly decreased under wet conditions.

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