scholarly journals Mechanical and Physical Properties of Hybrid Cu-Graphite Composites Prepared via Powder Metallurgy Technique

2017 ◽  
Vol 24 (1) ◽  
pp. 11-24
Keyword(s):  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Physical Properties ◽  
Powder Mixture ◽  
Pure Copper ◽  
Powder Metallurgy Technique ◽  
Yttria Content ◽  
Mechanical And Physical Properties ◽  
Cold Pressed ◽  
Graphite Composites

Copper -graphite composites are widely used in a great number of engineering applications such as brushes, switches, sliding bearings, self-lubricating bearings, etc. due to their good thermal and electrical conductivity and excellent tribological properties as compared with other structural materials. There are ongoing attempts in manufacturing copper composites with better properties to enhance their efficiency and increase their effective life. Present research aims to prepare hybrid 95wt.% copper –5wt.% graphite composites reinforced with yttria and tin particles by powder metallurgy technique and to study their effects on mechanical and physical properties of the prepared composites. Powder mixture was mixed by ball mill mixer at 100rpm for 120min with (5/1) balls to powder ratio. The powder mixture was cold pressed at 700MPa for 30sec, followed by sintering at 900 ˚C for one hour. In the first stage, Yttria(Y2O3) was added with (2, 4, 6, 8, 10) wt% to pure copper (Cu) and to (95%Cu-5%Gr) matrices. Typical composite of this stage was ((95%Cu-5%Gr)-4%Y2O3. In the second stage, tin (Sn) was added with (2, 4, 6, 8, 10) wt% to pure copper and((95%Cu-5%Gr)-4%Y2O3 matrices. Typical composite of this stage was ((95%Cu-5%Gr)-4%Y2O3)-6%Sn. The results showed that hardness and true porosity of the composites increases with increasing yttria content. On the other hand, both thermal and electrical conductivity of the composites decreases with increasing yttria content. It was also found that (95 wt.% Cu- 5 wt.% Gr) – Y2O3 composites have always lower wear rate than plain Cu-Y2O3 composites.

scholarly journals Effect of Adding Nano Ag on Mechanical and Physical Properties of Cu–10% Fe Prepared by Powder Metallurgy Technique

2020 ◽  
Vol 28 (1) ◽  
pp. 13-20
Author(s):  
Farouk Mahdi ◽  
Omar Mahmood
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Physical Properties ◽  
Low Cost ◽  
Copper Matrix ◽  
Powder Metallurgy Technique ◽  
Main Requirement ◽  
Mechanical And Physical Properties

Copper-matrix composites have received a lot of attention and are used widely in various applications, such as electronics, machinery, automobile, military and aerospace; because of their remarkable electrical conductivity, high thermal conductivity and excellent mechanical properties. Among these are copper-iron composites which found many engineering applications due to the role of Fe in enhancing the mechanical properties of these composites beside its low cost. However, Fe addition reduces electrical and thermal conductivity therefore, binary Cu-Fe composites are not suitable for applications where these properties are the main requirement. Many studies have been done to enhance these properties by the addition of alloying elements. The present work aims to study the effect of adding Nano Ag on mechanical and physical properties of Cu-10 wt% Fe composites prepared by powder metallurgy technique. The results showed the effectiveness of Nano Ag in enhancing both mechanical and physical properties of Cu-10 wt% Fe composite. It is found that bulk density, electrical conductivity, and thermal conductivity have been increased by 1.19%, 46%, and 46% respectively on adding 5% Nano Ag. Hardness and compression strength have been increased by 17.3% and 32.8% respectively by adding 4% Nano Ag, while wear rate was reduced by 13.4% by adding 4% Nano Ag.

Characterization and Properties of Iron/Silica-Sand-Nanoparticle Composites

2011 ◽  
Vol 316-317 ◽  
pp. 97-106 ◽  
Author(s):  
Tahir Ahmad ◽  
Othman Mamat
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Metal Matrix ◽  
Silica Sand ◽  
Particulate Composites ◽  
Powder Metallurgy Technique ◽  
Superior Mechanical Properties ◽  
Iron Based ◽  
Nanoparticle Composites

Metal matrix-particulate composites fabricated by using powder metallurgy possess a higher dislocation density, a small sub-grain size and limited segregation of particles, which, when combined, result in superior mechanical properties. The present study aims to develop iron based silica sand nanoparticles composites with improved mechanical properties. An iron based silica sand nanoparticles composite with 5, 10, 15 and 20 wt.% of nanoparticles silica sand were developed through powder metallurgy technique. It was observed that by addition of silica sand nanoparticles with 20 wt.% increased the hardness up to 95HRB and tensile strength up to 690MPa. Sintered densities and electrical conductivity of the composites were improved with an optimum value of 15 wt.% silica sand nanoparticles. Proposed mechanism is due to diffusion of silica sand nanoparticles into porous sites of the composites.

COPPER ALLOY No. C15720

Alloy Digest ◽  
1989 ◽  
Vol 38 (3) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Good Strength ◽  
Metal Products ◽  
Electrical Apparatus

Abstract Copper No. C15720 is a powder metallurgy, dispersion strengthened copper alloy with A12O3 is a powder metallurgy, dispersion strengthened copper alloy with A12O3 as the dispersoid. It offers good strength (about 70,000 psi, annealed) and electrical conductivity (89% IACS, volume basis). It has broad and varied electrical apparatus applicability. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: Cu-545. Producer or source: SCM Metal Products.

Electrical, Mechanical and Microstructural Properties of Copper-Chromium-Silver-Alumina Composites Obtained by Powder Metallurgy

2014 ◽  
Vol 802 ◽  
pp. 78-83
Author(s):  
Waldemar Alfredo Monteiro ◽  
Juan Alfredo Guevara Carrió ◽  
M.A.R. Santos ◽  
D.S. Motta ◽  
L.C.E. Silva
Keyword(s):  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Electrical Contact ◽  
Pure Copper ◽  
Thermal Treatments ◽  
Microstructural Properties ◽  
Conductivity Data ◽  
Alumina Composites ◽  
Mechanical And Microstructural Properties ◽  
Electrical Conductivity Data

It has been studied the correlation of the obtained microstructures in cermets of Cu-Cr-Ag-Al2O3with the physical properties and the fabrication method varying the components proportions to obtain by powder metallurgy a material with good electrical conductivity and also good mechanical strength compared with pure copper allied to efficient fabrication and economical energetically process. The electrical conductivity data correspond to 40% IACS indicating that the utilized thermal treatments were relatively good for electrical contact applications and also mechanically.

scholarly journals The effect of neutron spectrum on the mechanical and physical properties of pure copper and copper alloys

1996 ◽  
Author(s):  
S.A. Fabritsiev ◽  
A.S. Pokrovsky ◽  
V.A. Sandakov ◽  
S.J. Zinkle ◽  
A.F. Rowcliffe ◽  
...  
Keyword(s):  
Physical Properties ◽  
Neutron Spectrum ◽  
Copper Alloys ◽  
Pure Copper ◽  
Mechanical And Physical Properties
Sign in / Sign up

Export Citation Format

Share Document