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.

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.

scholarly journals N-Dopant-Mediated Growth of Metal Oxide Nanoparticles on Carbon Nanotubes

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1882
Author(s):  
Jin Ah Lee ◽  
Won Jun Lee ◽  
Joonwon Lim ◽  
Sang Ouk Kim
Keyword(s):  
Carbon Nanotubes ◽  
Metal Oxide ◽  
Carbon Nanomaterials ◽  
Wide Spectrum ◽  
Metal Oxide Nanoparticles ◽  
Nucleation And Growth ◽  
Oxide Nanoparticles ◽  
Metal Oxide Nanoparticle ◽  
Nucleation Sites ◽  
Direct Growth

Metal oxide nanoparticles supported on heteroatom-doped graphitic surfaces have been pursued for several decades for a wide spectrum of applications. Despite extensive research on functional metal oxide nanoparticle/doped carbon nanomaterial hybrids, the role of the heteroatom dopant in the hybridization process of doped carbon nanomaterials has been overlooked. Here, the direct growth of MnOx and RuOx nanoparticles in nitrogen (N)-doped sites of carbon nanotubes (NCNTs) is presented. The quaternary nitrogen (NQ) sites of CNTs actively participate in the nucleation and growth of the metal nanoparticles. The evenly distributed NQ nucleation sites mediate the generation of uniformly dispersed <10 nm diameter MnOx and RuOx nanoparticles, directly decorated on NCNT surfaces. The electrochemical performance of the resultant hybridized materials was evaluated using cyclic voltammetry. This novel hybridization method using the dopant-mediated nucleation and growth of metal oxides suggests ways that heteroatom dopants can be utilized to optimize the structure, interface and corresponding properties of graphitic carbon-based hybrid materials.

Study of physical properties of metal oxide nanoparticles obtained in acoustoplasma discharge

2018 ◽  
Author(s):  
Mishik A. Kazaryan ◽  
Nikolay A. Bulychev ◽  
Robert A. Zakharyan ◽  
Valery V. Bodryshev ◽  
Marina N. Kirichenko ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Physical Properties ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles

Study on Ag/SnO2/TiO2 Electrical Contact Materials Prepared by Liquid Phase In Situ Chemical Route

2014 ◽  
Vol 936 ◽  
pp. 486-490 ◽  
Author(s):  
Yan Cai Zhu ◽  
Jing Qin Wang ◽  
Li Qiang An ◽  
Hai Tao Wang
Keyword(s):  
Liquid Phase ◽  
Electrical Properties ◽  
Electrical Contact ◽  
Electrical Performance ◽  
Powder Metallurgy Method ◽  
Chemical Route ◽  
Contact Materials ◽  
Electrical Contact Materials ◽  
Distribution State

In order to improve the machinability and electrical performance of the Ag electrical contact materials. A new kind of nano-Ag/SnO2-TiO2 electrical contact materials were prepared by liquid phase in-situ chemical route. The distribution state of elements titanium in copper and their effects on the microstructures and properties have been studied. The results of SEM show that SnO2-TiO2 powders are small, uniform and with no obvious phenomenon of reunion. At last, Ag/SnO2-TiO2 electrical contact materials were prepared by powder metallurgy method and electrical performance were done. Test results show that the electrical properties of Ag/SnO2-TiO2 are superior to the electrical properties of Ag/SnO2. Hence Ag/SnO2-TiO2 may become a new contact material which can replace Ag/SnO2.

Impact of pH changes on metal oxide nanoparticle behaviour during artificial digestion

2021 ◽  
Author(s):  
Thomas Schneider ◽  
Anna Mittag ◽  
Martin Westermann ◽  
Michael Glei
Keyword(s):  
Metal Oxide ◽  
Digestive Tract ◽  
Ph Value ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Ph Changes ◽  
Metal Oxide Nanoparticle ◽  
Artificial Digestion ◽  
Oxide Nanoparticle ◽  
Ingested Nanoparticles

The properties of orally ingested nanoparticles can be influenced by the conditions prevailing in the digestive tract. The influence of the pH value on the fate of metal oxide nanoparticles was demonstrated using a simplified digestion approach.

Controlling metal oxide nanoparticle size and shape with supercritical fluid synthesis

2019 ◽  
Vol 21 (14) ◽  
pp. 3769-3781 ◽  
Author(s):  
Mary Kate Mitchell Lane ◽  
Julie B. Zimmerman
Keyword(s):  
Metal Oxide ◽  
Supercritical Fluid ◽  
Metal Oxide Nanoparticles ◽  
Nanoparticle Synthesis ◽  
Oxide Nanoparticles ◽  
Green Solvents ◽  
Synthetic Route ◽  
Size And Shape ◽  
Metal Oxide Nanoparticle ◽  
Oxide Nanoparticle

Supercritical fluid nanoparticle synthesis (SCF nano synthesis) can robustly and readily control size and shape of metal oxide nanoparticles, while offering a potentially greener synthetic route through the employment of green solvents.

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

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