Preparation of Cu/Cr2O3 Composites by Mechanical Activation and In Situ Oxidation

Abstract

In order to improve the in situ oxidation kinetic condition of Al in Cu matrix, Cr, instead of Al was in situ oxidized to form Cu/Cr 2 O 3 composites in the present investigation, CuCr powders with different solubilities after mechanical activation were utilized to synthesize Cu/Cr 2 O 3 composites, and their microstructure and stability were analyzed. The results show that although the CuCr powders suffer from the same mechanical activation; Cr 2 O 3 particles formed by the powders with different solubilities have great differences in size, amount, and distribution. In the range of experiments, the Cu/Cr 2 O 3 composite formed by CuCr powders with 67% solution has large amounts of finer Cr 2 O 3 particles uniformly distributed in Cu matrix and the best stability at elevated temperatures.

Fabrication and evaluation of tribological properties of Al2O3 coated Ag reinforced copper matrix nanocomposite by mechanical alloying

“…In recent years, metal-ceramic composites combine many features of metals and ceramic, such as high level of wear and corrosion resistance, excellent thermal and electrical conductivity, etc [6][7][8][9]. Regardless of these advantages, the depressed of strength and wear resistance minimize/renders for heavy assignment applications.…”

The effects of mechanical milling on the structural, mechanical, and electromagnetic properties of Cu-8 wt% NdFeB composite alloys

“…1–3 These new materials have been produced by the introduction of very fine reinforcing second-phase particles of metal immiscible in copper (Cr, Nb, Zr, Mo or V), 4 intermetallic 5 or ceramic such as oxides, carbides, and borides. 6–9 In an attempt to develop new copper composite materials with optimal balance between structural (mechanical) and functional (electrical or magnetic) properties, special attention has been paid to reinforce a copper matrix by MA with functionalized multiwall carbon nanotubes 10 or ferromagnetic or superparamagnetic nanoparticles of Co, SmCo5, and Nb3Sn. 11–13 Since one of the main challenges inherent to MA is to obtain a homogeneous distribution of reinforcement particles in the matrix, 14–16 process parameters were carefully controlled and optimized in these works.…”