Fabrication of MWCNT-Reinforced Copper Composite and Thermal Expansion Behavor

2011 ◽  
Vol 694 ◽  
pp. 713-717
Author(s):  
Z. F. Fan ◽  
X.H. Chen ◽  
L.S. Xu ◽  
Y. Q. Liu ◽  
W. B. Zhong ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Cuprous Oxide ◽  
Pure Copper ◽  
Solution Phase ◽  
Mwcnt Content ◽  
Multi Walled Carbon Nanotube ◽  
The Matrix ◽  
Unique Method ◽  
Copper Composite ◽  
Copper Bulk

A unique method for preparation of multi-walled carbon nanotube (MWCNT)- reinforced copper composite is reported. It involves solution phase systhesis MWCNT-implanted cuprous oxide composite spheres, formation of MWCNT/ copper composite spheres after reduction in H2 atmosphere and preparation of the MWCNT/copper bulk with vacuum hot pressing. Scanning Eelectron Microscope image (SEM) of the fracture surfaces indicate MWCNTs are homogeneously dispersed in the composite and bonded to the matrix. In addition, the thermal expansion of the composites at various MWCNTs (0wt%, 1wt%, 5wt%) were investigated. The coefficient of the thermal expansion (CTE) was decreased with increase of the MWCNT content, which are all much lower than that of pure copper.

Preparation and Properties of Carbon Nanotubes Reinforced Cu Matrix Composites for Electronic Packaging Application

2013 ◽  
Vol 275-277 ◽  
pp. 1789-1793 ◽  
Author(s):  
Long Shan Xu ◽  
Xiao Hua Chen ◽  
Xing Jun Liu
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Packaging ◽  
Pure Copper ◽  
Copper Matrix ◽  
Matrix Composites ◽  
Composite Powders ◽  
Multi Walled Carbon Nanotube ◽  
The Matrix ◽  
Copper Composite ◽  
Copper Nanocomposites

Multi-walled carbon nanotube (MWCNT) reinforced copper nanocomposites were prepared using a unique spherical MWCNT-implanted copper composite powders. The MWCNTs are homogenously ‘locked’ in the composite and tightly bonded to the matrix, which makes them play excellent reinforcement role on the microhardness compared with the unreinforced pure copper. Although the thermal conductivity is not enhanced for the thermal resistance between the carbon nanotubes and the copper matrix; it is still high enough to be used as electronic packaging materials even the concentration of MWCNTS in the composite is up to 5 wt%. Furthermore, the thermal expansion of the composites decreased apparently with the addition of the carbon nanotubes.

The Chemical Plating Copper of the SiC Particles and Thermal Expansion Behavior of the SiCp/Cu Composites

2013 ◽  
Vol 544 ◽  
pp. 334-338
Author(s):  
Ming Hu ◽  
Yun Long Zhang ◽  
You Jin Liu ◽  
Jing Gao
Keyword(s):  
Thermal Expansion ◽  
Pure Copper ◽  
Copper Matrix ◽  
Copper Plating ◽  
Chemical Plating ◽  
Thermal Expansion Coefficients ◽  
Sic Particles ◽  
Expansion Behavior ◽  
The Matrix

In this paper, the chemical copper plating technology was utilized to modify the SiC particles and the SiCp/Cu composites were fabricated by the pressure-less sintering technology. The effect of pretreatment solution on the coating quality of the SiC particles was discussed in details. The pure copper and copper- coated SiC particles or SiC particles without coated copper were used to fabricate the SiCp/Cu composites. At the same time, the microstructures and thermal expansion coefficients of the SiCp/Cu composites were studied. The results showed that the uniform and continuous Cu coating on the SiC particles can be obtained after chemical copper plating, and the copper-coated SiC particles can distributed continuously in the matrix of the SiCp/Cu composites. The chemical copper plating technology could improve the wettability between SiC particles and copper matrix obviously. The addition of the SiC particle could reduce the CTE of the SiCp/Cu composites.

Transition alpha structure in beta-isomorphous Nb-Hf alloys

1987 ◽  
Vol 45 ◽  
pp. 232-233
Author(s):  
R.W. Carpenter ◽  
Changhai Li ◽  
David J. Smith
Keyword(s):  
Solid Solution ◽  
Solution Phase ◽  
Miscibility Gap ◽  
Large Strains ◽  
Solid Solution Phase ◽  
Two Phase ◽  
Diffuse Intensity ◽  
Metastable Form ◽  
The Matrix ◽  
Equilibrium Morphology

Binary Nb-Hf alloys exhibit a wide bcc solid solution phase field at temperatures above the Hfα→ß transition (2023K) and a two phase bcc+hcp field at lower temperatures. The β solvus exhibits a small slope above about 1500K, suggesting the possible existence of a miscibility gap. An earlier investigation showed that two morphological forms of precipitate occur during the bcc→hcp transformation. The equilibrium morphology is rod-type with axes along <113> bcc. The crystallographic habit of the rod precipitate follows the Burgers relations: {110}||{0001}, <112> || <1010>. The earlier metastable form, transition α, occurs as thin discs with {100} habit. The {100} discs induce large strains in the matrix. Selected area diffraction examination of regions ∼2 microns in diameter containing many disc precipitates showed that, a diffuse intensity distribution whose symmetry resembled the distribution of equilibrium α Bragg spots was associated with the disc precipitate.

scholarly journals Fabrication and Characterization of the Modified EV31-Based Metal Matrix Nanocomposites

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 125
Author(s):  
Seyed Kiomars Moheimani ◽  
Mehran Dadkhah ◽  
Mohammad Hossein Mosallanejad ◽  
Abdollah Saboori
Keyword(s):  
Thermal Expansion ◽  
Mechanical Strength ◽  
Metal Matrix ◽  
Coefficient Of Thermal Expansion ◽  
Structural Effect ◽  
Metal Matrix Nanocomposites ◽  
Mechanical Stirring ◽  
Specific Strength ◽  
The Matrix ◽  
Matrix Nanocomposites

Metal matrix nanocomposites (MMNCs) with high specific strength have been of interest for numerous researchers. In the current study, Mg matrix nanocomposites reinforced with AlN nanoparticles were produced using the mechanical stirring-assisted casting method. Microstructure, hardness, physical, thermal and electrical properties of the produced composites were characterized in this work. According to the microstructural evaluations, the ceramic nanoparticles were uniformly dispersed within the matrix by applying a mechanical stirring. At higher AlN contents, however, some agglomerates were observed as a consequence of a particle-pushing mechanism during the solidification. Microhardness results showed a slight improvement in the mechanical strength of the nanocomposites following the addition of AlN nanoparticles. Interestingly, nanocomposite samples were featured with higher electrical and thermal conductivities, which can be attributed to the structural effect of nanoparticles within the matrix. Moreover, thermal expansion analysis of the nanocomposites indicated that the presence of nanoparticles lowered the Coefficient of Thermal Expansion (CTE) in the case of nanocomposites. All in all, this combination of properties, including high mechanical strength, thermal and electrical conductivity, together with low CTE, make these new nanocomposites very promising materials for electro packaging applications.

scholarly journals Solution-Phase Epitaxial Growth of Quasi-Monocrystalline Cuprous Oxide on Metal Nanowires

Nano Letters ◽  
2014 ◽  
Vol 14 (10) ◽  
pp. 5891-5898 ◽  
Author(s):  
Beniamino Sciacca ◽  
Sander A. Mann ◽  
Frans D. Tichelaar ◽  
Henny W. Zandbergen ◽  
Marijn A. van Huis ◽  
...  
Keyword(s):  
Epitaxial Growth ◽  
Cuprous Oxide ◽  
Solution Phase ◽  
Metal Nanowires

Evaluation of the Mechanical Properties of Copper Thin Film and Copper Bulk at the Nano-Scale by Nanoindenter

2011 ◽  
Vol 117-119 ◽  
pp. 394-397
Author(s):  
Jen Ching Huang ◽  
Yung Jin Weng
Keyword(s):  
Mechanical Properties ◽  
Pure Copper ◽  
Copper Film ◽  
Value Change ◽  
Load Increment ◽  
Nano Scale ◽  
Indentation Tests ◽  
The Relationship ◽  
Increasing Load ◽  
Copper Bulk

This study used the nanoindenter to perform indentation tests on copper bulk and nano copper film in order to discuss the mechanical properties of pure copper at the nano scale. This study tested 7 levels of load, ranging from 20 to 200 μN (load increment at 30 μN) for the indentation tests on copper bulk and nano copper film specimens. Results showed that the load was roughly proportional to the residual depth, in the case of flat nano copper film, while the relationship between the load and the residual depth was not significant in the case of unsmooth copper bulk. Moreover, the hardness of both the copper bulk and the nano copper film would increase along with increasing load, while the Er value change trends of both the copper bulk and the nano copper film specimens differed with increasing load.

Investigation of Thermochemical Hydrogen Production via the Novel Thermo-Mechanical Stabilized Iron Oxide-Zirconia Porous Structure

2013 ◽  
Author(s):  
Ayyoub M. Mehdizadeh ◽  
Kelvin Randhir ◽  
James F. Klausner ◽  
Nicholas AuYeung ◽  
Fotouh Al-Raqom ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Porous Structure ◽  
Chemical Reactivity ◽  
Thermal Reduction ◽  
The Novel ◽  
Concentrated Solar Energy ◽  
The Matrix ◽  
Unique Method ◽  
Laboratory Scale Reactor ◽  
The Stability

In this study we have developed a unique method for synthesizing very reactive water splitting materials that will remain stable at temperatures as high as 1450 °C to efficiently produce clean hydrogen from concentrated solar energy. The hydrogen production for a laboratory scale reactor using a “Thermo-mechanical Stabilized Porous Structure” (TSPS) is experimentally investigated for oxidation and thermal reduction temperatures of 1200 and 1450 °C, respectively. The stability and reactivity of a 10 g TSPS over many consecutive oxidation and thermal reduction cycles for different particle size ranges has been investigated. The novel thermo-mechanical stabilization exploits sintering and controls the geometry of the matrix of particles inside the structure in a favorable manner so that the chemical reactivity of the structure remains intact. The experimental results demonstrate that this structure yields peak hydrogen production rates of 1–2 cm3/(min.gFe3O4) during the oxidation step at 1200 °C and the 30 minute thermal reduction step at 1450 ° C without noticeable degradation over many consecutive cycles. The hydrogen production rate is one of the highest yet reported in the open literature for thermochemical looping processes using thermal reduction. This novel process has strong potential for developing an enabling technology for efficient and commercially viable solar fuel production.

scholarly journals Particularities of structure formation of aluminum-copper composite materials manufactured by casting technology

2020 ◽  
pp. 116-121
Author(s):  
V. A. Kalinichenko ◽  
A. S. Kalinichenko ◽  
S. V. Grigoriev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Structure Formation ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Alloying Elements ◽  
Casting Technology ◽  
The Matrix ◽  
Reinforcing Material ◽  
Copper Composite

To create friction pairs operating in severe working conditions, composite materials are now increasingly used. Composite materials obtained with the use of casting technologies are of interest due to the possibility to manufacture wide range of compositions at low price compared to powder metallurgy. Despite the fact that many composite materials have been sufficiently studied, it is of interest to develop new areas of application and give them the properties required by the consumer. In the present work the composite materials on the basis of silumin reinforced with copper granules were considered. Attention was paid to the interaction between the matrix alloy and the reinforcing phase material as determining the properties of the composite material. The analysis of distribution of the basic alloying elements in volume of composite material and also in zones of the interphases interaction is carried out. The analysis of the possibility of obtaining a strong interphase zone of contact between the reinforcing component and the matrix material without significant dissolution of the reinforcing material is carried out.

Development of piezoresistive PDMS/MWCNT foam nanocomposite sensor with ultrahigh flexibility and compressibility

2021 ◽  
pp. 1045389X2110643
Author(s):  
Pardis Ghahramani ◽  
Kamran Behdinan ◽  
Hani E. Naguib
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Polymer Foam ◽  
Mwcnt Content ◽  
Mechanical Hysteresis ◽  
Electrical Hysteresis ◽  
Multi Walled Carbon Nanotube ◽  
Monitoring Applications ◽  
Healthcare Monitoring ◽  
High Flexibility

Polymer foam nanocomposites attract great interest in many wide ranges of biomedical and healthcare monitoring applications. In this study, we investigated the effect of porosity and multi-walled carbon nanotube (MWCNT) content on the piezoresistivity, sensitivity, and mechanical properties of Polydimethylsiloxane (PDMS)/MWCNT foam nanocomposite. The foam nanocomposites were fabricated by particulate leaching method and their electrical and mechanical characteristics were investigated using the different porosity levels (60% and 70%) and different conductive nanofiller contents (0.5 wt.% and 1 wt.%). The foam nanocomposites with 0.5 wt.% MWCNT content and 60% porosity possessed higher pressure sensitivity, higher gage factor, and lower electrical hysteresis along with higher mechanical properties. Moreover, fabricated PDMS/MWCNT foam nanocomposite demonstrated high flexibility, high compressibility, and high recoverability in addition to limited mechanical hysteresis (less than 3%) with a large dynamic sensing range. Contrary to the existing foam nanocomposite samples in the literature, PDMS/MWCNT foam nanocomposites withstood higher pressure ranges (3.5–5 MPa) at limited thickness (average 2.3 mm) without experiencing noticeable macroscopic damage.

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