Study on Mechanical Properties and Physical Properties of Copper Based Electrical Contact Materials Reinforced by CNT

2010 ◽  
Vol 139-141 ◽  
pp. 67-71
Author(s):  
Zhong Quan Guo ◽  
Hao Ran Geng ◽  
Sha Sha Feng
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Physical Properties ◽  
Sliding Wear ◽  
Electrical Contact ◽  
Wear Property ◽  
Contact Materials ◽  
Electrical Contact Materials ◽  
Made In

A new method of carbon nanotube with electroless plating of nickel is proposed. It is shown that in a certain condition, the compacted and well-distributed coating of nickel is obtained without the process of sensitization and activation. Upon the surface treatment of the carbon nanotube, the CNT-consolidated composites for copper-based electrical contact have been made in the way of powder metallurgy. Some important mechanical properties and physical properties, including sliding wear property, electrical conductivity and fusion resistance, were investigated. The experiment results showed that Carbon nanotube inside the composite was uniformly distributed and a proper addition of CNT effectively improves the comprehensive property of the composites. When the carbon nanotube takes up 4vol. % in the material, it is highly effective in improving its sliding wear property and fusion resistance; though its electrical conductivity drops. Its overall properties meet the requirements of electrical contact materials

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.

Effect of SnO2 Particle Size on Properties of Ag-SnO2 Electrical Contact Materials Prepared by the Reductive Precipitation Method

2014 ◽  
Vol 936 ◽  
pp. 459-463 ◽  
Author(s):  
Zhi Jie Lin ◽  
Xu Dong Sun ◽  
Shao Hong Liu ◽  
Jia Lin Chen ◽  
Ming Xie ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Citric Acid ◽  
Electrical Contact ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Composite Powders ◽  
Contact Materials ◽  
Electrical Contact Materials ◽  
Ag Particle

Performances of Ag-SnO2 electrical contact materials can be strongly affected by the microstructure. In this work, Ag-SnO2 composite powders were synthesized by chemical reductive precipitation method. During the precipitation process, Ag particle was deposited onto the surface of SnO2 particle with the assistance of citric acid. The microstructure and properties were analyzed for the prepared Ag-SnO2 electrical contact materials. Our research reveals that the particle size of SnO2 has significant influence on the morphology of the Ag-SnO2 composite powders, and therefore on the microstructure and physical properties of the electrical contact materials. With the decrease of particle size of SnO2, hardness of the Ag-SnO2 electrical contact materials increases, while electrical conductivity decreases.

scholarly journals Microstructure and properties of silver based cadmium free electrical contact materials

2007 ◽  
Vol 43 (2) ◽  
pp. 171-176 ◽  
Author(s):  
N. Talijan ◽  
V. Cosovic ◽  
Jasna Stajic-Trosic ◽  
A. Grujic ◽  
Dragana Zivkovic ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Mechanical Treatment ◽  
Electrical Contact ◽  
Small Addition ◽  
Experimental Results ◽  
Contact Materials ◽  
Microstructure And Properties ◽  
Simultaneous Study ◽  
Electrical Contact Materials ◽  
Microstructure Density

The presented work covers part of experimental results of simultaneous study of microstructure, density, hardness and electrical conductivity of sintered electrical contact materials based of Ag- SnO2 with 8, 10 and 12 mass% SnO2. The mentioned characteristics were analyzed in the function of different sintering regimes and after additional mechanical treatment (forging and rolling). The influence of small addition of In2O3 (2.9 mass%) on the increase of dispersion of main oxide SnO2 in Ag matrix is observed and presented also.

scholarly journals Synthesis of Ti3GeC2 Powders from Ti-Ge-TiC Mixtures by Pressureless Sintering

2020 ◽  
Author(s):  
Liu Qiaodan ◽  
Wubian Tian ◽  
Zhengming Sun ◽  
Peigen Zhang ◽  
Wenwen Zha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Purity ◽  
High Performance ◽  
Reaction Path ◽  
Sintering Temperature ◽  
Electrical Contact ◽  
Pressureless Sintering ◽  
Contact Materials ◽  
Electrical Contact Materials ◽  
Optimized Conditions

Abstract Ti3GeC2 compound has excellent electrical and mechanical properties, which can be used as a potential reinforcement for Ag-based electrical contact materials. However, few reports have been addressed on the synthesis of its powders. The present study, therefore, presents a new route to fabricate high-purity Ti3GeC2 powders from Ti/Ge/TiC by pressureless sintering in vacuum. The influence of sintering temperature and Ge content on the powder purity was studied and the optimized conditions are found to be 1550 ℃ and Ti:Ge:TiC=1:1.1:2. In addition, the reaction path of Ti/Ge/TiC was revealed to be three steps: First, liquid Ge starts to react with Ti to form Ti5Ge3 compounds at around 1140 ℃; Then Ti5Ge3 consumes the liquid Ge and TiC to form Ti2GeC at around 1200 ℃; Finally, Ti2GeC transfers into Ti3GeC2 with the consumption of residual TiC. The present study lays the foundation for the subsequent applications of Ti3GeC2 powders in high performance composites.

scholarly journals Comparison of properties of silver-metal oxide electrical contact materials

2012 ◽  
Vol 48 (1) ◽  
pp. 131-141 ◽  
Author(s):  
V. Cosovic ◽  
N. Talijan ◽  
D. Zivkovic ◽  
D. Minic ◽  
Z. Zivkovic
Keyword(s):  
Metal Oxide ◽  
Physical Properties ◽  
Metal Oxide Nanoparticles ◽  
Electrical Contact ◽  
Oxide Nanoparticles ◽  
Powder Metallurgy Method ◽  
Contact Materials ◽  
Metal Oxide Nanoparticle ◽  
Electrical Contact Materials ◽  
Silver Metal

Changes in physical properties such as density, porosity, hardness and electrical conductivity of the Ag-SnO2 and Ag-SnO2In2O3 electrical contact materials induced by introduction of metal oxide nanoparticles were investigated. Properties of the obtained silver-metal oxide nanoparticle composites are discussed and presented in comparison to their counterparts with the micro metal oxide particles as well as comparable Ag-SnO2WO3 and Ag-ZnO contact materials. Studied silvermetal oxide composites were produced by powder metallurgy method from very fine pure silver and micro- and nanoparticle metal oxide powders. Very uniform microstructures were obtained for all investigated composites and they exhibited physical properties that are comparable with relevant properties of equivalent commercial silver based electrical contact materials. Both Ag-SnO2 and Ag- SnO2In2O3 composites with metal oxide nanoparticles were found to have lower porosity, higher density and hardness than their respective counterparts which can be attributed to better dispersion hardening i.e. higher degree of dispersion of metal oxide in silver matrix.

Microstructure, Hardness and Electrical Conductivity of Silver-Metal Oxides Electrical Contact Materials

2012 ◽  
Vol 486 ◽  
pp. 529-532 ◽  
Author(s):  
Kessaraporn Wathanyu ◽  
Siriporn Rojananan
Keyword(s):  
Electrical Conductivity ◽  
Metal Oxides ◽  
Electrical Contact ◽  
Contact Materials ◽  
Powder Metallurgy Process ◽  
Uniform Dispersion ◽  
Silver Matrix ◽  
Electrical Contact Materials ◽  
Metallurgy Process ◽  
Silver Metal

The aim of this paper was to study the microstructure, hardness and electrical conductivity of silver-metal oxides electrical contact materials. The Ag-SnO2, Ag-ZnO and Ag-CuO were prepared by powder metallurgy process. The density, microstructure, hardness and electrical conductivity were investigated. The results showed that the density of silver-metal oxides were 91-96% of theoretical density. The microstructures exhibited that the metal oxides were uniform dispersion in the silver matrix. The hardness of Ag-(5, 10)SnO2 and Ag-(5, 10)ZnO samples were about 100 HV and the hardness of Ag-(5, 10)CuO samples were about 88 HV. The Ag-5CuO samples had the highest electrical conductivity at the value of 91.27 %IACS.

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