Feasibility Analysis of Electrodeposited Cu-W-Co Alloys

2014 ◽  
Vol 881-883 ◽  
pp. 702-707 ◽  
Author(s):  
Yuan Hui Li ◽  
Zhong Cheng Guo ◽  
Bi Fang Huang ◽  
Hui Huang
Keyword(s):  
Aqueous Solution ◽  
Copper Alloys ◽  
Electrical Contact ◽  
Copper Matrix ◽  
Feasibility Analysis ◽  
Cobalt Ions ◽  
Contact Materials ◽  
Co Alloys ◽  
Contact Field ◽  
Theory And Experiment

Electrodeposited environmental and energy-saving electrodeposited copper alloys materials without silver element will be one of the hotspots on the exploitation of the copper matrix electrical contact field. Theoretically expression of Cu, W, Co and Cu-W-Co alloys electrodeposition possibility is thermodynamically analyzed by the potential-pH plots of Cu-H2O,Co-H2O and W-H2O at normal temperature. It is found that Cu, Co can be deposited together in Cu2+,Co2+aqueous solution. Cu-W isn’t deposited from it’s Cu2+,WO42-aqueous solution, only if Co-W induced deposition under the cobalt ions’ circumstances. So, It is possible that Cu-W-Co alloys are prepared from Cu2+,Co2+,WO42-aqueous solution by the electrodeposition in the theory and experiment, which will be new method and theory for Cu-W-Co serial contact materials’ preparation.

scholarly journals Fabrication of SiC@Cu/Cu Composites with the Addition of SiC@Cu Powder by Magnetron Sputtering

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Zhang Yunlong ◽  
Li Wenbo ◽  
Hu Ming ◽  
Yi Hongyong ◽  
Zhou Wei ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Relative Density ◽  
Vickers Hardness ◽  
Surface Engineering ◽  
Coefficient Of Thermal Expansion ◽  
Electrical Contact ◽  
Engineering Application ◽  
Copper Matrix ◽  
Contact Materials ◽  
Electrical Contact Materials

In view of the surface engineering application of electrical contact materials, SiC ceramic particles were introduced into copper matrix composites by the hot-press sintering method for the sake of enhancing the service life of copper matrix electrical contact materials. Magnetron sputtering technology was exploited to form the continuous copper film on the β-SiC powders in order to improve interface wettability between SiC powder and copper matrix. The SiC@Cu powders were treated by magnetron sputtering technology. Then, dynamic deposit behavior was described according to SEM results. The phase constitution, fracture morphology, relative density, porosity, Vickers hardness, and coefficient of thermal expansion of SiC@Cu/Cu composites with different SiC@Cu addition were analyzed in detail. The results showed that SiC@Cu powders with higher fraction in the SiC@Cu/Cu composites would decrease relative density and increase porosity, so it resulted in improvement of Vickers hardness. The addition of SiC@Cu decreased CTE values of the SiC@Cu/Cu composite, especially at high-level fraction SiC@Cu powder.

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.

scholarly journals High Oxidation Resistance of CVD Graphene-Reinforced Copper Matrix Composites

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 498 ◽  
Author(s):  
Mingliang Wu ◽  
Baosen Hou ◽  
Shengcheng Shu ◽  
Ao Li ◽  
Qi Geng ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Oxidation Resistance ◽  
Electrical Contact ◽  
Chemical Vapor ◽  
Surface Oxidation ◽  
Copper Matrix ◽  
Contact Materials ◽  
Graphene Layers ◽  
Electrical Contact Materials ◽  
Pure Cu

Copper-based materials are common industrial products which have been broadly applied to the fields of powder metallurgy, electrical contact, and heat exchangers, etc. However, the ease of surface oxidation limits the durability and effectiveness of copper-based components. Here, we have developed a powder metallurgy process to fabricate graphene/copper composites using copper powders which were first deposited with graphene layers by thermal chemical vapor deposition (CVD). The graphene/copper composites embedded with an interconnected graphene network was then able to be obtained by vacuum hot-pressing. After thermal oxidation (up to 220 °C) in humid air for several hours, we found that the degree of surface oxidation of our samples was much less than that of their pure Cu counterpart and our samples produced a much smaller increase of interfacial contact resistance when used as electrical contact materials. As a result, our graphene/copper composites showed a significant enhancement of oxidation resistance ability (≈5.6 times) compared to their pure Cu counterpart, thus offering potential applications as novel electrical contact materials.

Material transfer behavior of AgTiB2 and AgSnO2 electrical contact materials under different currents

2017 ◽  
Vol 114 ◽  
pp. 139-148 ◽  
Author(s):  
Hangyu Li ◽  
Xianhui Wang ◽  
Xiuhua Guo ◽  
Xiaohong Yang ◽  
Shuhua Liang
Keyword(s):  
Electrical Contact ◽  
Material Transfer ◽  
Contact Materials ◽  
Transfer Behavior ◽  
Electrical Contact Materials

Properties of doped Ag–SnO2 electrical contact materials with different SnO2 particle sizes

2018 ◽  
Vol 6 (1) ◽  
pp. 016558 ◽  
Author(s):  
Wang Haitao ◽  
Zhang Mei ◽  
Yang Menglin ◽  
Wang Jingqin ◽  
Zhu Yancai
Keyword(s):  
Electrical Contact ◽  
Particle Sizes ◽  
Contact Materials ◽  
Sno2 Particle ◽  
Electrical Contact Materials

scholarly journals CHITOSAN-TEMPLATED LIGHTWEIGHT SPINEL CoAl2O4 NANOFIBRIL AEROGELS

2018 ◽  
Vol 56 (1A) ◽  
pp. 135
Author(s):  
Chau The Lieu Trang
Keyword(s):  
Aqueous Solution ◽  
Aluminum Hydroxide ◽  
Water Soluble ◽  
Metal Hydroxides ◽  
Cobalt Ions ◽  
Spider Web ◽  
Magnetic Ceramics ◽  
Aluminum Ions ◽  
Soluble Aluminum ◽  
Mixed Metal Hydroxides

We present lightweight macro-mesoporous spinel CoAl2O4 nanostructured aerogels derived from water-soluble aluminum-chitosan complexes. Chitosan nanofibrils interact with aluminum ions to swell into hydrogels. The aluminum-induced swelling is extended to dissolve the hydrogels in water to form a homogeneous aluminum-chitosan aqueous solution. The addition of cobalt ions in the aluminum-chitosan liquids which are solidified by lyophilization to generate cotton-like aerogel composites. Uniform incorporation of cobalt-aluminum hydroxide ions onto chitosan leads nanofibrils to serve as a hierarchical template to support mixed metal hydroxides in the aerogel composites. We investigated the thermal removal of chitosan template in the composites to obtain spinel CoAl2O4 aerogels that truly replicate spider web-like fibrillar networks of chitosan template. Enlarged porosity, high crystallinity, and lightweight make the CoAl2O4 aerogels useful as a colorful nano-pigment for magnetic ceramics.

scholarly journals Microstructure refinement and physical properties of Ag-SnO2 based contact materials prepared by high-energy ball milling

2013 ◽  
Vol 45 (2) ◽  
pp. 173-180 ◽  
Author(s):  
V. Cosovic ◽  
M. Pavlovic ◽  
A. Cosovic ◽  
P. Vulic ◽  
M. Premovic ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Physical Properties ◽  
Ball Milling ◽  
Electrical Contact ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Powder Metallurgy Method ◽  
Contact Materials ◽  
Energy Ball ◽  
Electrical Contact Materials

High energy ball milling was used in order to improve dispersion of metal oxide in Ag-SnO2 electrical contact materials. The processed Ag-SnO2 (92:8) and Ag-SnO2In2O3 (87.8:9.30:2.9) powder mixtures were subsequently consolidated to bulk solid pieces by conventional powder metallurgy method. The characterization of the prepared samples included microstructural analysis by XRD and SEM, as well as measurements of physical properties such as density, hardness and electrical conductivity. The results of X-Ray analysis point to reduction of crystallite size after milling of about ten times. Microstructures of sintered Ag-SnO2 and Ag-SnO2 In2O3 materials display very fine dispersion of the oxide components in silver matrix. Somewhat higher uniformity was obtained for Ag-SnO2 In2O3 material which was illustrated by results of SEM analysis and more consistent microhardness values. The obtained values of studied physical properties were found to be in accordance with observed higher dispersion of metal oxide particles and comparable to properties of commercial electrical contact materials of this type.

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