Gr/Cu Composites: Microstructure and Properties

Graphene(Gr) reinforced copper matrix composites(Gr/Cu) were prepared by powder metallurgy process, and the effects of graphene content on microstructure and properties of the composites were investigated. The microstructure, density, hardness and electrical conductivity of the composites were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), density measurement, hardness tester and conductivity meter. The microstructure results show that with the increase of graphene content, the number of pores in the composites increased continuously, and the interface of the composites was well bonded. It was observed that there was no cracking and obvious interfacial reaction. However there were a lot of dislocations and twins in the matrix Cu, which might be the main reason for the decrease of the conductivity of the composites. The results of the composites’ properties revealed that with the increase of graphene content, the density and electrical conductivity of the composites decreased, the hardness increased first and then decreased. When the mass fraction of graphene was 0.5%, the maximum HBW was 175, and when the mass fraction of graphene was 3%, the density and conductivity of the composites decreased by 12% and 45% respectively, compared with pure copper.

Download Full-text

Effects of graphene content on the microstructure and properties of copper matrix composites

Carbon ◽

10.1016/j.carbon.2015.10.023 ◽

2016 ◽

Vol 96 ◽

pp. 836-842 ◽

Cited By ~ 200

Author(s):

Fanyan Chen ◽

Jiamin Ying ◽

Yifei Wang ◽

Shiyu Du ◽

Zhaoping Liu ◽

...

Keyword(s):

Copper Matrix ◽

Matrix Composites ◽

Copper Matrix Composites ◽

Microstructure And Properties ◽

Graphene Content

Download Full-text

Process of In Situ Cr Oxidation in Cu-Cr Pre-Alloyed Powders

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.152-153.1587 ◽

2010 ◽

Vol 152-153 ◽

pp. 1587-1590

Author(s):

Shu Hua Liang ◽

Xian Hui Wang ◽

Jun Tao Zou ◽

Peng Xiao

Keyword(s):

Electron Microscopy ◽

Solid Solution ◽

Copper Matrix ◽

High Energy ◽

Oxide Dispersion ◽

Matrix Composites ◽

Fine Particulates ◽

In Situ Oxidation ◽

Transmission Electron

The in-situ oxidation technique is an effective method of synthesizing copper matrix composites reinforced by oxide dispersion. In this study, the process of fabricating Cu/Cr2O3 composite by Cr in-situ oxidation in Cu-Cr pre-alloyed powders was investigated. The evolution of the structure formed in the processing of Cu/Cr2O3 composites was characterized by optical microscopy and transmission electron microscopy (TEM). The results show that the sub-solution Cu-Cr alloy powders can be produced by high energy milling, in which Cr powders are first crushed into fine particulates, followed by the formation of Cr sub-solution in copper under the extrusion and impact of high energy grinding balls. In the Cu/Cr2O3 composite fabricated by the Cu-Cr pre-alloyed powders, the Cr2O3 particulates produced exist almost in the original sites of the Cr, and they are dispersed uniformly within the Cu matrix. The distribution of Cr2O3 particulates is similar to that in the full solid solution Cu-Cr powders.

Download Full-text

Synthesis and Forming of Titanium Matrix Composites by Casting Route

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.334-335.297 ◽

2007 ◽

Vol 334-335 ◽

pp. 297-300

Author(s):

Si Young Sung ◽

Bong Jae Choi ◽

Young Jig Kim

Keyword(s):

Electron Microscopy ◽

Melting Furnace ◽

Vacuum Induction Melting ◽

Induction Melting ◽

Matrix Composites ◽

Titanium Matrix ◽

Titanium Matrix Composites ◽

Electron Probe Micro Analyzer ◽

Transmission Electron

The aim of this study is to evaluated the possibility of the in-situ synthesized (TiC+TiB) reinforced titanium matrix composites (TMCs) for the application of structural materials. In-situ synthesis and casting of TMCs were carried out in a vacuum induction melting furnace with Ti and B4C. The synthesized TMCs were characterized using scanning electron microscopy, an electron probe micro-analyzer and transmission electron microscopy, and evaluated through thermodynamic calculations. The spherical TiC plus needle-like and large, many-angled facet TiB reinforced TMCs can be synthesized with Ti and B4C by a melting route.

Download Full-text

Observation of Interfaces of Si-Ti-C-O Fiber/Mullite Matrix Composites by Analytical Transmission Electron Microscopy

Journal of the Ceramic Society of Japan ◽

10.2109/jcersj.103.1197 ◽

1995 ◽

Vol 103 (1203) ◽

pp. 1197-1200 ◽

Cited By ~ 3

Author(s):

Yoshihiro HIRATA ◽

Ryoko YAMASHITA ◽

Manabu MATSUDA ◽

Masaki SHIBUYA

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Analytical Transmission Electron Microscopy ◽

Matrix Composites ◽

Transmission Electron

Download Full-text

Chemical Stability of Ti3C2 MXene with Al in the Temperature Range 500–700 °C

Materials ◽

10.3390/ma11101979 ◽

2018 ◽

Vol 11 (10) ◽

pp. 1979 ◽

Cited By ~ 7

Author(s):

Jing Zhang ◽

Shibo Li ◽

Shujun Hu ◽

Yang Zhou

Keyword(s):

Electron Microscopy ◽

Chemical Stability ◽

Metal Matrix ◽

Matrix Composites ◽

X Ray Diffraction ◽

X Ray ◽

Temperature Range ◽

Transmission Electron ◽

Work First ◽

Scanning Electron

Ti3C2Tx MXene, a new 2D nanosheet material, is expected to be an attractive reinforcement of metal matrix composites because its surfaces are terminated with Ti and/or functional groups of –OH, –O, and –F which improve its wettability with metals. Thus, new Ti3C2Tx/Al composites with strong interfaces and novel properties are desired. To prepare such composites, the chemical stability of Ti3C2Tx with Al at high temperatures should be investigated. This work first reports on the chemical stability of Ti3C2Tx MXene with Al in the temperature range 500–700 °C. Ti3C2Tx is thermally stable with Al at temperatures below 700 °C, but it reacts with Al to form Al3Ti and TiC at temperatures above 700 °C. The chemical stability and microstructure of the Ti3C2Tx/Al samples were investigated by differential scanning calorimeter, X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy.

Download Full-text

Solution-Based Synthesis of Magnesium Oxide Nanorods

MRS Proceedings ◽

10.1557/proc-581-3 ◽

1999 ◽

Vol 581 ◽

Cited By ~ 12

Author(s):

Q. Wei ◽

C.M. Lieber

Keyword(s):

Electron Microscopy ◽

Magnesium Oxide ◽

Magnesium Chloride ◽

Low Cost ◽

Industrial Applications ◽

Transformation Process ◽

Matrix Composites ◽

X Ray ◽

Transmission Electron ◽

Oxide Nanorods

ABSTRACTA solution-based synthesis route was developed to produce large quantities of MgO nanorods. Hydrated basic magnesium chloride, which has needle-like crystal structure, was used as a precursor. A subsequent two-step transformation process with magnesium hydroxide as an intermediate product was used to preserve the morphology of the precursor to yield magnesium oxide nanorods. Scanning electron microscopy, powder X-ray diffraction and energy dispersive X-ray spectroscopy show that the products are very pure (>95%) crystalline MgO nanorods with diameters from 40 nm to 200 nm and lengths 10 microns or longer. High-resolution transmission electron microscopy and electron diffraction further reveal that these MgO nanorods are single crystals and that the rod axis is along the <110> crystal direction. A model for the structural transformation from hydrated basic magnesium chloride to magnesium oxide has been developed and compared to our experimental results. This solution-based process can be easily scaled-up, and is a low-cost source of pure magnesium oxide nanorods needed in many industrial applications, for example, as reinforcing agents in matrix composites and as flux-pinning centers in high-TC superconductors.

Download Full-text

Processing and Characterization of Particulate SiC Reinforced Copper Matrix Composites

Volume 1 ◽

10.1115/esda2004-58355 ◽

2004 ◽

Author(s):

V. V. Bhanu Prasad ◽

V. Vasudeva Rao ◽

Aditya Putrevu ◽

A. S. Vijay ◽

G. Harini

Keyword(s):

Coefficient Of Thermal Expansion ◽

Electrical Contact ◽

Copper Matrix ◽

Matrix Composites ◽

X Ray Diffraction ◽

Tungsten Alloys ◽

Copper Matrix Composites ◽

Particulate Silicon ◽

Sic Composites ◽

Microstructure Density

Copper Matrix Composites reinforced with particulate Silicon Carbide were consolidated by Vacuum Hot Pressing and Press-Sinter routes. The reinforcement content was varied from 10% to 30% by volume. The composites were then characterized for their microstructure, density, X-ray diffraction (XRD), Coefficient of Thermal Expansion (CTE), hardness, tensile strength, electrical conductivity and elastic modulus. The properties were compared with those of Copper Tungsten alloys. Cu/SiC composites are found to be potential materials for electrical contact and welding applications. An attempt has also been made to evaluate the suitability of copper matrix composites as a replacement to copper tungsten alloys.

Download Full-text