scholarly journals Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route

2007 ◽  
Vol 72 (11) ◽  
pp. 1115-1125 ◽  
Author(s):  
Marija Korac ◽  
Zoran Andjic ◽  
Milos Tasic ◽  
Zeljko Kamberovic
Keyword(s):  
Electrical Properties ◽  
Ion Beam ◽  
Analytical Electron Microscopy ◽  
Copper Matrix ◽  
Homogeneous Distribution ◽  
Composite Powders ◽  
Nano Composite ◽  
Mechanical And Electrical Properties ◽  
Thermochemical Method

This paper presents the synthesis of nano-composite Cu-Al2O3 powder by a thermochemical method and sintering, with a comparative analysis of the mechanical and electrical properties of the obtained solid samples. Nano-crystalline Cu-Al2O3 powders were produced by a thermochemical method through the following stages: spray-drying, oxidation of the precursor powder, reduction by hydrogen and homogenization. Characterization of powders included analytical electron microscopy (AEM) coupled with energy dispersive spectroscopy (EDS), differential thermal and thermogravimetric (DTA-TGA) analysis and X-ray diffraction (XRD) analysis. The size of the produced powders was 20-50 nm, with a noticeable presence of agglomerates. The composite powders were characterized by a homogenous distribution of Al2O3 in a copper matrix. The powders were cold pressed at a pressure of 500 MPa and sintered in a hydrogen atmosphere under isothermal conditions in the temperature range from 800 to 900 ?C for up to 120 min. Characterization of the Cu-Al2O3 sintered system included determination of the density, relative volume change, electrical and mechanical properties, examination of the microstructure by SEM and focused ion beam (FIB) analysis, as well as by EDS. The obtained nano-composite, the structure of which was, with certain changes, preserved in the final structure, provided a sintered material with a homogeneous distribution of dispersoid in a copper matrix, with exceptional effects of reinforcement and an excellent combination of mechanical and electrical properties.

A COMPARISON OF 85%W-15%CU COMPOSITES SYNTHESIZED BY NANO AND MICRO POWDERS

2012 ◽  
Vol 05 ◽  
pp. 574-580
Author(s):  
C. DEHGHNIAN ◽  
M. TAKESTANI
Keyword(s):  
Mechanical Properties ◽  
Electrical Properties ◽  
Physical And Mechanical Properties ◽  
Theoretical Density ◽  
Composite Powders ◽  
Nano Composite ◽  
Powder Mixtures ◽  
Mechanical And Electrical Properties ◽  
Friction Energy ◽  
Nano Size

Two kinds of tungsten-copper composites with the composition of 85% W -15% Cu were synthesized using mechanochemically produced nano size and conventional micro size powders. The densification, mechanical and electrical properties of these composites was examined. It was found that the samples sintered from nanopowders had more densities and better physical and mechanical properties than those produced from micro sized powders. The micro W - Cu powder mixtures were pressed to 60 percent of its theoretical density but the nano composite powders were difficult to press due to its high friction energy and only reached to 30 percent of its theoretical density. The highest densities were obtained from nano composite mixtures at 1200°C.

Characterization of Mechanical and Electrical Properties of Nanocomposites

2013 ◽  
pp. 163-184
Author(s):  
Iren E. Kuznetsova ◽  
Boris D. Zaitsev ◽  
Alexander M. Shikhabudinov
Keyword(s):  
Electrical Properties ◽  
Mechanical And Electrical Properties

Pre-Meeting Topical Conference

2002 ◽  
Vol 8 (I1) ◽  
pp. 20-20
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Voltage ◽  
Ion Beam ◽  
Analytical Electron Microscopy ◽  
Polymeric Materials ◽  
Specimen Preparation ◽  
Microbeam Analysis ◽  
Scanning Electron

Topic: Characterization of Non-Conductive or Charging Materials by Microbeam AnalysisThe goal of this topical conference is to present the state of the art for materials characterization of non-conductive or charging materials using microbeam analysis. Examples of charging materials include polymeric materials, ceramic materials, and photoresist materials in the microelectronic industry. Also, the characterization of biological specimens will be covered because they are prone to problems related to charging. These materials are of great technological importance and their characterization is still a great challenge because they charge when analyzed with an electron beam. The techniques of microbeam analysis that will be considered are: X-ray Microanalysis in the Electron Microprobe, Low Voltage Scanning Electron Microscopy, Environmental Scanning Electron Microscopy, Analytical Electron Microscopy with Field Emission Transmission Electron Microscopy, and Focused Ion Beam Milling for specimen preparation. World experts will present papers on these topics. Papers from this topical conference will be published in a special issue of Microscopy & Microanalysis.

scholarly journals Characterization of the water diffusion in GEM foil material

2018 ◽  
Vol 174 ◽  
pp. 03005
Author(s):  
L. Benussi ◽  
S. Bianco ◽  
G. Saviano ◽  
S. Muhammad ◽  
D. Piccolo ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Diffusion Rate ◽  
Moisture Diffusion ◽  
Comsol Multiphysics ◽  
Concentration Profiles ◽  
Detector Performance ◽  
Mechanical And Electrical Properties ◽  
Time Required ◽  
And Diffusion

Systematic studies on the GEM foil material are performed to measure the moisture diffusion rate and saturation level. These studies are important because the presence of this compound inside the detector’ s foil can possibly change its mechanical and electrical properties, and in such a way, the detector performance can be affected. To understand this phenomenon, a model is developed with COMSOL Multiphysics v. 4.3 [1], which described the adsorption and diffusion within the geometry of GEM foil, the concentration profiles and the time required to saturate the foil. The COMSOL model is verified by experimental observations on a GEM foil sample. This note will describe the model and its experimental verification results.

Mechanical, Electrical and Thermal Characterization of Commercially Available LTCC Dielectric Tapes

2013 ◽  
Vol 543 ◽  
pp. 212-215
Author(s):  
Goran Radosavljević ◽  
Nelu Blaž ◽  
Andrea Marić ◽  
W. Smetana ◽  
Ljiljana Živanov
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Electrical Properties ◽  
Material Characterization ◽  
Mechanical Characterization ◽  
Thermal Characterization ◽  
Material Parameters ◽  
Mechanical And Electrical Properties

Presented paper deals with mechanical and electrical properties of several commercially available LTCC (Low Temperature Co-fired Technology) tapes, as well as their thermal characterization. Three commercially available dielectric tape materials provided by Heraeus (CT700, CT707 and CT800) are investigated. The samples for determination of significant material parameters are prepared using the standard LTCC fabrication process. Results of the material characterization (chemical analysis, surface roughness electrical and mechanical properties) are presented. In addition thermo-electrical and-mechanical characterization of investigated tapes analysis is performed.

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.

Characterization of PEO-Based Composite Cathodes. I. Morphological, Thermal, Mechanical, and Electrical Properties

2000 ◽  
Vol 147 (2) ◽  
pp. 451 ◽  
Author(s):  
G. B. Appetecchi ◽  
M. Carewska ◽  
F. Alessandrini ◽  
P. P. Prosini ◽  
S. Passerini
Keyword(s):  
Electrical Properties ◽  
Mechanical And Electrical Properties ◽  
Composite Cathodes
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