scholarly journals Effect of Particle Size on the Mechanical and Electrical Properties of Epoxy/Spherical Silica Composites

2013 ◽  
Vol 14 (1) ◽  
pp. 39-42 ◽  
Author(s):  
Jae-Jun Park
Keyword(s):  
Particle Size ◽  
Electrical Properties ◽  
Mechanical And Electrical Properties ◽  
Spherical Silica ◽  
Effect Of Particle Size

Effect of Ag addition in Sn on growth of SnTe compound during reaction between molten solder and tellurium

2010 ◽  
Vol 25 (2) ◽  
pp. 391-395 ◽  
Author(s):  
Chien-Neng Liao ◽  
Yen-Chun Huang
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Electrical Properties ◽  
Bismuth Telluride ◽  
Molten Solder ◽  
Thermoelectric Modules ◽  
Ag Addition ◽  
Mean Particle Size ◽  
Mechanical And Electrical Properties ◽  
The Mean

SnTe is the most common compound formed at the bismuth telluride/metal soldered junction of thermoelectric modules. It affects the mechanical and electrical properties of the soldered junction. In the study we investigate the growth of SnTe compound during reaction between molten Sn–3.5Ag solder and tellurium at 250 °C. We found that the growth of SnTe is suppressed by Ag–Te bilayer compounds that block further reaction between liquid Sn and Te. With increasing reaction time, the SnTe morphology becomes rough as a result of coarsening of SnTe grains. The growth of SnTe grains follows the conservative ripening kinetics with the mean particle size proportional to one-third power of reaction time.

ELASTOMERIC COMPOSITES BASED ON NANOSPHERICAL PARTICLES AND CARBON NANOTUBES: A COMPARATIVE STUDY

2013 ◽  
Vol 86 (3) ◽  
pp. 423-448 ◽  
Author(s):  
Liliane Bokobza
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Aspect Ratio ◽  
Carbon Black ◽  
Spherical Particles ◽  
Styrene Butadiene Rubber ◽  
Mechanical And Electrical Properties ◽  
Polymer Filler ◽  
Spherical Silica

ABSTRACT The reinforcement of elastomeric materials by addition of mineral fillers represents one of the most important aspects in the field of rubber science and technology. The improvement in mechanical properties arises from hydrodynamic effects depending mainly on the amount of filler and the aspect ratio of the particles and also on polymer–filler interactions depending on the surface characteristics of the filler particles and the chemical nature of the polymer. The past few years have seen the extensive use of nanometer-scale particles of different morphologies on account of the small size of the filler and the corresponding increase in the surface area that allow a considerable increase in mechanical properties even at very low filler loading. Among these nanoparticles, spherical particles (such as silica or titania) generated in situ by the sol-gel process and carbon nanotubes are typical examples of materials used as a nanosize reinforcing additive. Specific features of filled elastomers are discussed through the existing literature and through results of the author's research based on poly(dimethylsiloxane) filled with spherical silica or titania particles and on styrene–butadiene rubber filled with multiwall carbon nanotubes. The reinforcing ability of each type of filler is discussed in terms of morphology, state of dispersion (investigated by transmission electron microscopy, atomic force microscopy, small-angle neutron scattering), and mechanical and electrical properties. In addition, the use of molecular spectroscopies provides valuable information on the polymer–filler interface. Spherical silica and titania spherical particles are shown to exhibit two distinct morphologies, two different polymer–filler interfaces that influence the mechanical properties of the resulting materials. The superiority of carbon nanotubes over carbon black for mechanical reinforcement and electrical conduction is mainly attributed to their large aspect ratio rather than to strong polymer–filler interactions. The use of hybrid fillers (carbon nanotubes in addition to carbon black or silica, for example) has been shown to give promising results by promoting an enhancement of mechanical and electrical properties with regard to each single filler.

Physical, Mechanical and Electrical Properties of W-20 wt.% Cu Composite Produced by Liquid Phase Sintering Process

2014 ◽  
Vol 879 ◽  
pp. 21-26
Author(s):  
Fauzi Ismail ◽  
Mohd Asri Selamat ◽  
Norhamidi Muhamad ◽  
Abu Bakar Sulong ◽  
Nurzirah Abdul Majid
Keyword(s):  
Particle Size ◽  
Liquid Phase ◽  
Electrical Properties ◽  
Microstructure Evolution ◽  
Sintering Temperature ◽  
Cold Isostatic Pressing ◽  
Liquid Phase Sintering ◽  
Sintering Process ◽  
Composite Powders ◽  
Mechanical And Electrical Properties

In this study, the effect of sintering temperature on the properties of tungsten-copper (W-Cu) composite produced by liquid phase sintering (LPS) process has been investigated. W-20 wt.% Cu composite powders with particle size less than 1 μm was prepared by cold compaction and followed by cold isostatic pressing. The green specimens were then sintered under nitrogen based atmosphere in the temperature range of 1100°C to 1300°C. The sintering studies were conducted to determine the extent of densification and corresponding to microstructure changes. In addition, the properties of the sintered specimens such as physical appearance, microstructure evolution, mechanical and electrical properties were presented and discussed.

Effect of particle size on the fracture toughness of epoxy resin filled with spherical silica

Polymer ◽  
1992 ◽  
Vol 33 (16) ◽  
pp. 3415-3426 ◽  
Author(s):  
Yoshinobu Nakamura ◽  
Miho Yamaguchi ◽  
Masayoshi Okubo ◽  
Tsunetaka Matsumoto
Keyword(s):  
Fracture Toughness ◽  
Particle Size ◽  
Epoxy Resin ◽  
Spherical Silica ◽  
Effect Of Particle Size
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