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 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.

Incorporation of carbon nanotubes into polyethylene by high energy ball milling: Morphology and physical properties

2007 ◽  
Vol 45 (5) ◽  
pp. 597-606 ◽  
Author(s):  
Giuliana Gorrasi ◽  
Maria Sarno ◽  
Antonio Di Bartolomeo ◽  
Diana Sannino ◽  
Paolo Ciambelli ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Physical Properties ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Hydrogen in Metallic Nanostructures

2007 ◽  
Vol 555 ◽  
pp. 327-334 ◽  
Author(s):  
R.A. Andrievski
Keyword(s):  
Physical Properties ◽  
Crystallite Size ◽  
Ball Milling ◽  
High Energy ◽  
Structural Features ◽  
Metallic Nanostructures ◽  
High Energy Ball Milling ◽  
Universal Method ◽  
Characterization Methods ◽  
Energy Ball

Features of hydrogen nanostructure synthesis are described as applied to metals (Mg and Pd) and intermetallics (Mg2Ni, FeTi and LaNi5). Attention is focused on the high-energy ball milling as a universal method for hydrogen nanostructure preparation. The effect of crystallite size, absorption/desorption properties of Pd - H2, Mg2Ni - H2, TiFe - H2 and Mg - H2 systems are characterized in detail. Structural features and some physical properties of nanohydrides studied by different independent characterization methods are considered.

Preparation of CNT/AlSi10Mg composite powders by high-energy ball milling and their physical properties

2016 ◽  
Vol 23 (3) ◽  
pp. 330-338 ◽  
Author(s):  
Lin-zhi Wang ◽  
Ying Liu ◽  
Wen-hou Wei ◽  
Xu-guang An ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Physical Properties ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Composite Powders ◽  
Energy Ball

Hydrogen generation performance of novel Al–LiH–metal oxides

2018 ◽  
Vol 5 (7) ◽  
pp. 1700-1706 ◽  
Author(s):  
Peng Li ◽  
Fen Xu ◽  
Lixian Sun ◽  
Yongpeng Xia ◽  
Jun Chen ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Ball Milling ◽  
Hydrogen Generation ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Oxide Composites

A series of novel hydrogen production materials, Al–LiH–metal oxide composites, have been prepared via high energy ball milling.

Effect of Pressing Force on the Physical Properties of CaMgTiO3 Ceramic Prepared by HEBM

2014 ◽  
Vol 895 ◽  
pp. 311-314 ◽  
Author(s):  
Nurhashimah Hassim ◽  
Wan Nurulhuda Wan Shamsuri ◽  
Nur Liyana Amiar Rodin ◽  
Rosli Hussin ◽  
Karim Deraman ◽  
...  
Keyword(s):  
Physical Properties ◽  
Ball Milling ◽  
Grain Growth ◽  
Raw Materials ◽  
High Energy ◽  
Sem Analysis ◽  
High Energy Ball Milling ◽  
Particle Sizes ◽  
Milling Method ◽  
Energy Ball

CaMgTiO3 ceramics were synthesized by using the high energy ball-milling method (HEBM) at different pressing forces. The raw materials were ball milled for 20 hours and sintered at 1000°C. Ceramics surfaces morphologies and particle sizes were measured using SEM analysis. Archimedes’ method was adapted to obtain their densities and porosities. It was found that pressing forces influenced both morphologies and particle sizes. As pressing forces increased, the particle sizes decreased as shown in SEM observation. However, the particle sizes increased at 200 kN due to agglomerated grain growth. The densities were almost constant with increasing of pressing forces while porosities were reduced.

scholarly journals Impact Evaluation of High Energy Ball Milling Homogenization Process in the Phase Distribution of Hydroxyapatite-Barium Titanate Plasma Spray Biocoating

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 728
Author(s):  
Roberto Gómez Batres ◽  
Zelma S. Guzmán Escobedo ◽  
Karime Carrera Gutiérrez ◽  
Irene Leal Berumen ◽  
Abel Hurtado Macias ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Ball Milling ◽  
Plasma Spray ◽  
Bonding Strength ◽  
Phase Distribution ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray ◽  
Nanomechanical Properties ◽  
Energy Ball

Air plasma spray technique (APS) is widely used in the biomedical industry for the development of HA-based biocoatings. The present study focuses on the influence of powder homogenization treatment by high-energy ball milling (HEBM) in developing a novel hydroxyapatite-barium titanate (HA/BT) composite coating deposited by APS; in order to compare the impact of the milling process, powders were homogenized by mechanical stirring homogenization (MSH) too. For the two-homogenization process, three weight percent ratios were studied; 10%, 30%, and 50% w/w of BT in the HA matrix. The phase and crystallite size were analyzed by X-ray diffraction patterns (XRD); the BT-phase distribution in the coating was analyzed by backscattered electron image (BSE) with a scanning electron microscope (SEM); the energy-dispersive X-ray spectroscopy (EDS) analysis was used to determinate the Ca/P molar ratio of the coatings, the degree of adhesion (bonding strength) of coatings was determinate by pull-out test according to ASTM C633, and finally the nanomechanical properties was determinate by nanoindentation. In the results, the HEBM powder processing shows better efficiency in phase distribution, being the 30% (w/w) of BT in HA matrix that promotes the best bonding strength performance and failure type conduct (cohesive-type), on the other hand HEBM powder treatment promotes a slightly greater crystal phase stability and crystal shrank conduct against MSH; the HEBM promotes a better behavior in the nanomechanical properties of (i) adhesive strength, (ii) cohesive/adhesive failure-type, (iii) stiffness, (iv) elastic modulus, and (v) hardness properties.

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