scholarly journals Fabrication of Copper-Graphite MMCs Using Powder Metallurgy Technique

2018 ◽  
Vol 24 (10) ◽  
pp. 49 ◽  
Author(s):  
Mohamed Khazal Hussein ◽  
Walaa W. Jameel ◽  
Noor Fadhil Athraa Sabah
Keyword(s):  
Powder Metallurgy ◽  
Wear Test ◽  
Copper Matrix ◽  
Processing Parameters ◽  
Inert Atmosphere ◽  
Powder Metallurgy Technique ◽  
Graphite Composite ◽  
The Matrix ◽  
Bearing Materials ◽  
Pure Cu

Copper, and its, alloys and composites (being the matrix), are broadly used in the electronic as well as bearing materials due to the excellent thermal and electrical conductivities it has. In this study, powder metallurgy technique was used for the production of copper graphite composite with three volume perc ent of graphite.  Processing parameters selected is (900) °C sintering temperature and (90) minutes holding time for samples that were heated in an inert atmosphere (argon gas). Wear test results showed a pronounced improvement in wear resistance as the percent of graphite increased which acts as solid lubricant (where wear rate was decreased by about 88% as compared with pure Cu). Microhardness and compressive strength increased (about 8% and 16%, for each of them) and reached to the maximum values at 1% graphite percentage as compared with pure Cu, then it decreased after that critical graphite concentration. Microstructure test indicated that the dark region in the copper matrix was increased as the percent of graphite increased and the reinforcement particles were homogeneously distributed which means that the powder metallurgy technique is suitable for such task.  

Structure and Properties of Electroless Cu and Ni-B Coated B4C Particle Dispersed Aluminum Composites by Powder Metallurgy Technique

2015 ◽  
Vol 830-831 ◽  
pp. 480-484
Author(s):  
J.P. Deepa ◽  
S. Abhilash ◽  
T.P.D. Rajan ◽  
C Pavithran ◽  
B.C. Pai
Keyword(s):  
Powder Metallurgy ◽  
Aluminum Matrix ◽  
Light Weight ◽  
Structure And Properties ◽  
Powder Metallurgy Technique ◽  
Coated Particles ◽  
Industrial Sectors ◽  
The Matrix ◽  
Electroless Process ◽  
Dispersed Aluminum

The widespread demand for light-weight materials in various emerging industrial sectors lead to the fabrication of aluminum- boron carbide composites. In this study, the B4C particles were coated copper and Ni-B through electroless process using formaldehyde and sodium borohydride respectively as reducing agents under optimized condition. The microstructural and hardness behavior were investigated for powder metallurgy processed 20 vol. % of B4C and coated B4C particles in the aluminum matrix. Microscopic observation revealed that coating improved the dispersibility of B4C particles in the matrix. The coated particles showed an increase in hardness and particle compaction with reduced porosity.

Effect of Processing Parameters on the Microstructure and Mechanical Behaviour of Nano Bioceramic

2008 ◽  
Author(s):  
Xueran Liu ◽  
Ahmed R. El-Ghannam
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Powder Metallurgy ◽  
Stress Shielding ◽  
Processing Parameters ◽  
Processing Conditions ◽  
Powder Metallurgy Technique ◽  
Regenerative Capacity ◽  
Structural Support ◽  
Superior Mechanical Properties

Silica-calcium phosphate nanocomposite (SCPC) has a superior bone regenerative capacity and resorbability when compared to hydroxyapatie (HA) and bioactive glass [1–2]. Synthesis of SCPC bioceramics with superior mechanical properties has been an important and challenging issue. Ideally, the mechanical strength of the orthopedic implantat should be comparable to that of the host-bone in order to provide structural support and minimize stress shielding. The compressive strength of trabecular bone ranges from 2–12 MPa and that of cortical bone varies in the range of 100–230 MPa [3]. The aim of the present study is to study the effect of processing parameters on the mechanical properties of SCPC cylinders prepared by powder metallurgy technique. The mechanical properties were correlated to the microstructure of SCPC prepared under different processing conditions.

scholarly journals Corrosion Examination on Copper based Composite Under Different Environmental Conditions

2019 ◽  
Vol 8 (4S2) ◽  
pp. 280-283
Keyword(s):  
Fly Ash ◽  
Powder Metallurgy ◽  
Matrix Composite ◽  
Environmental Conditions ◽  
Copper Matrix ◽  
Powder Metallurgy Technique ◽  
Powder Metallurgy Process ◽  
Copper Matrix Composite ◽  
Metallurgy Process

Copper matrix composite reinforced with fly ash is prepared by powder metallurgy process. Three composites with 0%, 2.5% and 5% fly ash proportion are prepared. The specimens were compacted at 450MPa and Sintered at 950℃ for a period of 30 minutes in powder metallurgy technique. The prepared specimens were subjected to different corrosion environments (alkaline and acidic) and the corroded surface will be analysed using SEM/EDX.

Wear behaviour of copper/carbon nanotubes

2017 ◽  
Vol 69 (3) ◽  
pp. 342-347 ◽  
Author(s):  
Nor Shamimi Shaari ◽  
Jamaliah Md Said ◽  
Aidah Jumahat ◽  
Muhammad Hussain Ismail
Keyword(s):  
Carbon Nanotubes ◽  
Wear Test ◽  
Hardness Test ◽  
Copper Matrix ◽  
Wear Behaviour ◽  
Wear Depth ◽  
Wear Properties ◽  
Test Analysis ◽  
Content Type ◽  
Pure Cu

Purpose The purpose of this paper is to study the wear behaviour of copper matrix composites reinforced with carbon nanotubes (CNTs) prepared by powder metallurgy route. Design/methodology/approach The CNTs were treated by sulphuric acid and nitric acid to deagglomerate the CNTs prior mixing with copper powder. The composites comprised 0 to 4 Vol.% pristine CNTs (PCNTs) and also after acid-treated CNTs (ACNTs). The optimum value (pure Cu, 3 Vol.% PCNTs, 3 Vol.% ACNTs) evaluated by micro-hardness test was selected for wear test analysis. Findings The results showed that the enhancement of hardness, weight loss, coefficient of friction, wear depth and surface roughness (Ra) was due to the effect of homogenous distribution of ACNTs in Cu matrix and significant bonding compared to pure Cu and Cu-reinforced PCNTs. The scanning electron microscopy micrograph of worn surfaces and wear depth of the specimens also showed that the addition of ACNTs in Cu resulted in better wear performances. Originality/value CNTs were treated prior processing to improve hardness and wear properties of Cu/CNTs composites.

scholarly journals Enhancing Microstructure and Mechanical Properties of AZ31-MWCNT Nanocomposites through Mechanical Alloying

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
J. Jayakumar ◽  
B. K. Raghunath ◽  
T. H. Rao
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Matrix Material ◽  
Multiwall Carbon Nanotubes ◽  
High Energy ◽  
Powder Metallurgy Technique ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Microstructure Density

Multiwall carbon nanotubes (MWCNTs) reinforced Mg alloy AZ31 nanocomposites were fabricated by mechanical alloying and powder metallurgy technique. The reinforcement material MWCNTs were blended in three weight fractions (0.33%, 0.66%, and 1%) with the matrix material AZ31 (Al-3%, zinc-1% rest Mg) and blended through mechanical alloying using a high energy planetary ball mill. Specimens of monolithic AZ31 and AZ31-MWCNT composites were fabricated through powder metallurgy technique. The microstructure, density, hardness, porosity, ductility, and tensile properties of monolithic AZ31 and AZ31-MWCNT nano composites were characterized and compared. The characterization reveals significant reduction in CNT (carbon nanoTube) agglomeration and enhancement in microstructure and mechanical properties due to mechanical alloying through ball milling.

scholarly journals Sintering and Hardness Behavior of Fe-Al2O3 Metal Matrix Nanocomposites Prepared by Powder Metallurgy

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Pallav Gupta ◽  
Devendra Kumar ◽  
Om Parkash ◽  
A. K. Jha
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Behavior ◽  
Metal Matrix ◽  
Processing Parameters ◽  
Inert Atmosphere ◽  
Industrial Applications ◽  
Reactive Sintering ◽  
Metal Matrix Nanocomposites ◽  
Matrix Nanocomposites ◽  
Powder Metallurgy Route

The present paper reports the investigations on sintering and hardness behavior of Fe-Al2O3 Metal Matrix Nanocomposites (MMNCs) prepared by Powder Metallurgy (P/M) route with varying concentration of Al2O3 (5–30 wt%). The MMNC specimens for the present investigations were synthesized by ball milling, followed by compaction and sintering in an inert atmosphere in the temperature range of 900–1100°C for 1–3 hours using Powder Metallurgy route. Phase and microstructures of the specimens were characterized by XRD and SEM. Reactive sintering takes place in these materials. During sintering nano iron aluminate (FeAl2O4) phase forms. Characterization was done by measuring density and hardness. Results have been discussed critically to illustrate the effect of various processing parameters on sintering and mechanical behavior. It is expected that the results of these investigations will be useful in developing Metal Matrix Nanocomposites (MMNCs) for typical industrial applications.

scholarly journals High Oxidation Resistance of CVD Graphene-Reinforced Copper Matrix Composites

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 498 ◽  
Author(s):  
Mingliang Wu ◽  
Baosen Hou ◽  
Shengcheng Shu ◽  
Ao Li ◽  
Qi Geng ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Oxidation Resistance ◽  
Electrical Contact ◽  
Chemical Vapor ◽  
Surface Oxidation ◽  
Copper Matrix ◽  
Contact Materials ◽  
Graphene Layers ◽  
Electrical Contact Materials ◽  
Pure Cu

Copper-based materials are common industrial products which have been broadly applied to the fields of powder metallurgy, electrical contact, and heat exchangers, etc. However, the ease of surface oxidation limits the durability and effectiveness of copper-based components. Here, we have developed a powder metallurgy process to fabricate graphene/copper composites using copper powders which were first deposited with graphene layers by thermal chemical vapor deposition (CVD). The graphene/copper composites embedded with an interconnected graphene network was then able to be obtained by vacuum hot-pressing. After thermal oxidation (up to 220 °C) in humid air for several hours, we found that the degree of surface oxidation of our samples was much less than that of their pure Cu counterpart and our samples produced a much smaller increase of interfacial contact resistance when used as electrical contact materials. As a result, our graphene/copper composites showed a significant enhancement of oxidation resistance ability (≈5.6 times) compared to their pure Cu counterpart, thus offering potential applications as novel electrical contact materials.

Development of Mg/Cu Nanocomposites Using Microwave Assisted Powder Metallurgy Technique

Materials ◽  
2005 ◽  
Author(s):  
W. L. E. Wong ◽  
M. Gupta
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Physical And Mechanical Properties ◽  
Microstructural Characterization ◽  
Radiant Heat ◽  
Powder Metallurgy Technique ◽  
Microwave Assisted ◽  
The Matrix ◽  
Rapid Sintering ◽  
Nano Size

In the present study, magnesium composites containing different amount of nano-size copper particulates were successfully synthesized using powder metallurgy technique coupled with a novel microwave assisted rapid sintering. Mg/Cu nanocomposites were sintered using a hybrid heating method consisting of microwaves and radiant heat from external susceptors. The sintered specimens were hot extruded and characterized in terms of microstructural, physical and mechanical properties. Microstructural characterization revealed minimal porosity and the presence of a continuous network of nano-size Cu particulates decorating the particle boundaries of the metal matrix. Mechanical characterization revealed that the addition of nano-size Cu particulates lead to an increase in hardness, 0.2% yield strength (YS) and ultimate tensile strength (UTS) of the matrix. An attempt is made in the present study to correlate the effect of increasing presence of nano-size Cu reinforcement on the microstructural, physical and mechanical properties of monolithic magnesium.

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