scholarly journals Microstructure and Properties of Multifibre Composites

2016 ◽  
Vol 61 (2) ◽  
pp. 911-916 ◽  
Author(s):  
W. Głuchowski ◽  
Z. Rdzawski ◽  
J. Domagała-Dubiel ◽  
J. Sobota
Keyword(s):  
Electrical Properties ◽  
Cross Section ◽  
Copper Matrix ◽  
Copper Base ◽  
Microstructure And Properties ◽  
Mechanical And Electrical Properties ◽  
The Cross

Abstract In the study microstructure and properties of composite multifibre copper-base wires are presented. A decision was made to produce wires with “soft” fibres (Al) and “hard” fibres (Fe). In the study the phenomenon occurring on the border of Al-Cu was also analysed. The produced Cu-Al and Cu-Fe composites presented ordered microstructure with the fibres uniformly distributed in the copper matrix. The composites underwent plastic consolidation to the degree which provided satisfactory mechanical and electrical properties. During the drawing the fibres deformed proportionally with copper matrix therefore their content in the cross section remained unchanged.

To the Question of the Manufacturing Ability a Contact Wire by Continuous Casting Rod

2021 ◽  
Vol 316 ◽  
pp. 426-432
Author(s):  
Raisa K. Mysik ◽  
Andrey V. Sulitsin ◽  
Vadim V. Morgunov
Keyword(s):  
Electrical Properties ◽  
Continuous Casting ◽  
Cross Section ◽  
Longitudinal Section ◽  
Contact Wire ◽  
Fine Grained ◽  
Mechanical And Electrical Properties ◽  
Fine Grained Structure ◽  
Tin Content ◽  
Continuous Casting Plant

The article presents the results of pilot-industrial experiments in the field of manufacturing technology of contact wire made of Cu-Sn alloys. Cast rods with a diameter of 20 mm, made of CuSn0.04, CuSn0.1, CuSn0.2, CuSn0.3, CuSn0.4 alloys, were obtained in a continuous casting plant on an Upcast system. Cast rods were deformed using a Conform technology, and extruded billets with a diameter of 18 and 20 mm were produced, which were subsequently drawn on a shaped contact wire with a cross section of 100 mm2. Cast rods macrostructure and microstructure were studied. The macrostructure quantitative assessment of samples was studied in a cross and longitudinal section. A plot of the effect of the tin content in the alloy on the average grain area in cross section is obtained. An increase in the tin content in the alloy leads to a decrease in the average grain area. An analysis of the rod microstructure in a cross section showed that the structure is a grain of an α-solid solution of tin in copper, and the grain boundaries are thin and clean. After deformation by Conform technology a uniform fine-grained structure is ensured. The effect of the tin content in the alloy on the Brinell hardness of cast billets, made by Conform technology, is determined. An increase in the tin content in the alloy leads to an increase in the hardness of both cast and deformed billets. The microstructure analysis of the contact wire in the cross section is carried out. The mechanical and electrical properties of the contact wire with a cross section of 100 mm2 are determined. An analysis of the results showed when the tin content in the alloy is up to 0.4 wt. %, the required level of mechanical and electrical properties of the contact wire is not provided. It may be necessary to change the size of the initial billet before drawing or to increase the tin content in the alloy more than 0.4 wt. %.

SYNTHESIS, MECHANICAL AND ELECTRICAL PROPERTIES OF CARBON MICROCOILS AND NANOCOILS

2010 ◽  
Vol 03 (04) ◽  
pp. 263-267 ◽  
Author(s):  
HUI BI ◽  
KAICHANG KOU ◽  
YONGBAI YIN ◽  
KOSTYA (KEN) OSTRIKOV ◽  
ZONGWEN LIU
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Cross Section ◽  
Electrical Resistance ◽  
Emission Intensity ◽  
Sem Analysis ◽  
Mechanical And Electrical Properties ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Test Voltage

The results on the synthesis, mechanical and electrical properties of carbon microcoils and nanocoils (CMCs, CNCs) synthesized using catalytic CVD and Ni–P and Co–P catalyst alloys, respectively, are reported. SEM analysis reveals that the CMCs and CNCs have unique helical morphologies, and diameters of 5.0–9.0 μm and 450–550 nm, respectively. Moreover, CMCs with flat cross-section can be stretched to 3 times their original coil lengths. Current–voltage characteristics of a single microcoil have also been obtained. It is found that the CMCs have the electrical conductivity between 100 and 160 S/cm, whereas the electrical resistance increases by about 20% during the coil extension. Besides, the microcoils can produce light in vacuum when the test voltage reaches 10 V. The emission intensity increases as the voltage increases. The mechanical and electrical properties of CMCs and CNC make them potentially useful in many applications in micromagnetic sensors, mechanical microsprings and optoelectronics.

scholarly journals Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route

2007 ◽  
Vol 72 (11) ◽  
pp. 1115-1125 ◽  
Author(s):  
Marija Korac ◽  
Zoran Andjic ◽  
Milos Tasic ◽  
Zeljko Kamberovic
Keyword(s):  
Electrical Properties ◽  
Ion Beam ◽  
Analytical Electron Microscopy ◽  
Copper Matrix ◽  
Homogeneous Distribution ◽  
Composite Powders ◽  
Nano Composite ◽  
Mechanical And Electrical Properties ◽  
Thermochemical Method

This paper presents the synthesis of nano-composite Cu-Al2O3 powder by a thermochemical method and sintering, with a comparative analysis of the mechanical and electrical properties of the obtained solid samples. Nano-crystalline Cu-Al2O3 powders were produced by a thermochemical method through the following stages: spray-drying, oxidation of the precursor powder, reduction by hydrogen and homogenization. Characterization of powders included analytical electron microscopy (AEM) coupled with energy dispersive spectroscopy (EDS), differential thermal and thermogravimetric (DTA-TGA) analysis and X-ray diffraction (XRD) analysis. The size of the produced powders was 20-50 nm, with a noticeable presence of agglomerates. The composite powders were characterized by a homogenous distribution of Al2O3 in a copper matrix. The powders were cold pressed at a pressure of 500 MPa and sintered in a hydrogen atmosphere under isothermal conditions in the temperature range from 800 to 900 ?C for up to 120 min. Characterization of the Cu-Al2O3 sintered system included determination of the density, relative volume change, electrical and mechanical properties, examination of the microstructure by SEM and focused ion beam (FIB) analysis, as well as by EDS. The obtained nano-composite, the structure of which was, with certain changes, preserved in the final structure, provided a sintered material with a homogeneous distribution of dispersoid in a copper matrix, with exceptional effects of reinforcement and an excellent combination of mechanical and electrical properties.

Processing and Electrical Properties of Nano-Al2O3/Cu Composites

2017 ◽  
Vol 898 ◽  
pp. 984-991 ◽  
Author(s):  
Yi Liu ◽  
Jin Feng Leng ◽  
Zhi Wei Li ◽  
Pei Yu Zhang ◽  
Qiu Rui Wu
Keyword(s):  
Electrical Properties ◽  
Electrical Contact ◽  
Electrical Equipment ◽  
Copper Matrix ◽  
Vacuum Arc ◽  
Matrix Composites ◽  
Contact Materials ◽  
Mechanical And Electrical Properties ◽  
Electrical Contact Materials ◽  
Pure Cu

Copper matrix composites (CMCs) are widely used in electrical equipment and electrical contact materials due to their excellent electrical properties. Al2O3 powders are widely used as a reinforcing agent to enhance mechanical properties of MMCs. The xAl2O3/Cu (x =0, 0.2, 0.5, 0.7, and 1.0wt. %) composites were prepared via vacuum arc melting method. The mechanical and electrical properties were obtained by measuring the hardness and conductivity. The morphology of copper and Al2O3/Cu composites was characterized by optical microscopy (OM) and scanning electron microscopy (SEM). With the addition of Al2O3 from 0.2 wt. % to 1.0 wt. %, the relative densities of composites decreased from 98.5% to 97.0%. The hardness of the composites increased with increase in the Al2O3 powders content. The hardness of 1.0Al2O3/Cu composites was 57.9 HB, which was higher than that of pure Cu by 18.6%.. With the addition of Al2O3, the IACS% of Al2O3/Cu composites decreased from 88.97 to 86.16.

Effect of Cooling Rate on Mechanical and Electrical Properties of Cu-TiB2 by Turbulent In-Situ Mixing Process

2007 ◽  
Vol 119 ◽  
pp. 135-138 ◽  
Author(s):  
J.S. Park ◽  
J.H Yun ◽  
Young Do Park ◽  
Yong Ho Park ◽  
Kyung Mok Cho ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Cooling Rate ◽  
Copper Matrix ◽  
Mixing Process ◽  
Transitional Layer ◽  
Mechanical And Electrical Properties ◽  
The Matrix ◽  
Copper Matrix Composite ◽  
Tib2 Particles

A copper matrix composite reinforced with in situ TiB2 nanoparticle was successfully fabricated by tubulent in-situ mixing process. The microstructure, mechanical and electrical properties of the in situ composite were investigated. The results showed that the in situ formed TiB2 particles, in which size varying from about 50nm to 200nm, exhibited a homogenous dispersion in the copper matrix. It is shown that the interface between the nanoscale particles and the matrix was clean without a transitional layer. Because of the reinforcement, the hardness and Young’s Modulus of the composite improved with increment of cooling rate. Moreover, the in situ Cu-TiB2 composite exhibited higher electrical conductivity with increasing of cooling rate.

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