Study of the phase transition ability of coal tar pitch and their coke products under the influence of temperature used to synthesise carbon composite materials

Using differential scanning calorimetry and thermogravimetric analysis showed the marking temperature of coal tar pitch is 107.8°C. The thermal decomposition of the pitch is divided into three main stages, corresponding to three phases α, β, γ, with a coke yield of 47% at 800°C. The change in the XRD diagram showed a clear transition from the amorphous state of carbon to the highly ordered crystalline structure of graphite after treatment at 2,200 and 2,700°С. The purity of the pitch sample and the structure of the CCC carbon-carbon composite material after heat treatment at 2,700°C were studied using scanning electron microscopy and energy-dispersive X-ray spectroscopy methods. The results showed that after heat treatment, the C content in the sample reached more than 99.5%, and the coke residues after graphitization were bound and connected to the carbon fabric into a mass of graphite material.

Fabrication Of Lithium-Carbon Composite Material From Pepper Peel Waste As Battery Electrodes

The manufacture of battery cathode electrodes made of LiFeO4 and activated carbon from pepper peel has been successfully carried out. The electrodes were made using the soli state reaction method with the addition of adhesives in the form of PVdf and NMP. The resulting homogeneous mixture is then placed in a mold and dried in an oven at 90° to dry to form sheets. The dried electrode sheets were then characterized using FTIR and tested for conductivity values using EIS. The FTIR results showed that there was no change in the functional group with the addition of carbon mass. Meanwhile, the results of the conductivity test showed that the optimum conductivity value occurred in the sample with the addition of 10% carbon mass is 7.42 × 10-4 S/cm.

Improving the antifriction properties of the housing-rotor coupling in axial turbomachines

The article discusses the frictional interaction of carbon-carbon composite material on steel. Antifriction properties and wear resistance of the material under dry friction at speeds up to 100 m/s are investigated. The effect of velocity and contact pressure on the friction coefficient and wear resistance of a carbon composite is analyzed. The regularities of the change in the coefficient of friction are determined depending on the load-speed factors. The assumption is substantiated that the high thermal stability of the carbon composite, its low hardness, good antifriction properties and high wear resistance allow the material to be used in friction units operating at very high speeds and temperatures. In order to improve the reliability and reduce gas flows in axial turbomachines, on the basis of the study carried out, it is recommended that instead of heat-resistant coatings, a lining of the gas duct casing should be made of carbon composite.

Investigating process technologies for production of carbon composite material antennas for maritime radio communication systems

The paper is dedicated to studying manufacturing prospects of antenna devices from carbon composite materials and suggests technical solutions aimed at water transportation radio communication needs. Principal physical parameters of the carbon composite material used in manufacture and subsequent studies of antenna specimens were compared to those of metals. Peculiarities of manufacturing carbon composite antenna devices have been considered. Antenna specimens were experimentally studied for their electromagnetic characteristics, while their digital copies were studied in simulation. Similarities are pointed out between the main characteristics of composite antennae and their metal analogs. Efficiency of proposed technical solutions and antenna building technologies are demonstrated for application of carbon composite antennas in marine radio communication.

Design and Construction of an Electric Guitar Body Made of Carbon Composite

This paper presents the selection of technology, technological and working procedures to construct the body of an electric guitar (Stratocaster type.). The used material for the electric guitar construction was carbon composite material offset by standardly used components. The carbon composite was chosen because of its excellent properties suitable for guitar construction. Described and used technologies were Manual Wet Lamination Technology and Vacuum Bag Molding (VBM) technology, and both are affordable and uncomplicated methods.

Modeling Deformation of Spur Gear

In The work considers 11 types of gears, features of their design and application. Analysis of gears designs is carried out, since shape of teeth directly affects process of teeth gearing, and this, in turn, affects load, which causes deformation of elements. 3D model of spur gear was created in ANSYS system. The work was limited by analyzing problem from point of view of gear wheels’ deformation, which were made of 40L carbon steel and carbon composite material. As a result, finite element modeling and analysis of gears using ANSYS system was carried out.

Introducing a New Industrial 3D Carbon/Composite Material for Heat Treat Applications

This paper introduces a new cost-effective grade of Carbon/Composite (C/C) for the manufacture of heat-treating fixtures, that brings the toughness associated with alloy materials, but with all the advantages C/C fixtures are known for.

Evaluation of the Yield Strength of a Carbon Composite Material Prepared by Wet Lamination and Vacuum Bag Molding

To evaluate tensile strength of the carbon composite material we used method of static tensile test according to the STN EN ISO 6892-1:2010-01 standard. The material for the production samples from the composite material was carbon fabrics KORDCARBON 200g/m2 – Twill weave. KORDCARBON 160g/m2 – Plain weave reinforced with epoxy resin Letoxid PR220+hardener EM315. The carbon composite for the test was prepared by Hand lay-up technology and Vacuum Bag molding method. Orientation to the layer laying direction of the individual samples in the test composite material influences the mechanical properties of the carbon fiber composite material produced by Hand lay-up technology and VMB- Vacuum molding bag method.