Effect of Space Holder and Compaction Pressure on the Porosity of Sintered Copper

2013 ◽  
Vol 795 ◽  
pp. 82-86 ◽  
Author(s):  
Shamsul Baharin Jamaludin ◽  
Chong Xin Yi ◽  
Alida Abdullah ◽  
Kamarudin Hussin
Keyword(s):  
Rotation Speed ◽  
Compaction Pressure ◽  
Argon Atmosphere ◽  
Powder Metallurgy Technique ◽  
True Density ◽  
Space Holder ◽  
Porous Copper ◽  
Sintered Copper ◽  
Roll Mill ◽  
Scanning Electron

The effect of space-holder content on the porosity of sintered copper that was fabricated by powder metallurgy technique has been investigated. Carbamide was used as space-holder and the content selected was 10 wt. %, 20 wt. % and 30 wt. %. A roll mill was used to mix the copper powder and the carbamide particles with rotation speed of 160 rpm for 2 hours. The mixture was compacted by hand press at 200-350MPa and sintered under argon atmosphere at 800°C. True density of the sample was determined by a gas pycnometer. Bulk density was determined using mass and volume of the sample. Result shows that the sintered porous copper with 30 wt. % of space-holder produced the highest porosity and the lowest density. Microstructure of pores was analyzed by a scanning electron microscope (SEM) which reveals the elongated pores interconnected to each other.

Fabrication and Characterization of Porous F-75 for Potential Application in Tissue Engineering

2013 ◽  
Vol 795 ◽  
pp. 78-81
Author(s):  
Shamsul Baharin Jamaludin ◽  
Tan Wei Leng ◽  
Nur Hidayah Ahmad Zaidi ◽  
Zuraidawani Che Daud ◽  
Mohd Noor Mazlee
Keyword(s):  
Compaction Pressure ◽  
Microstructural Analysis ◽  
Argon Atmosphere ◽  
Pore Shape ◽  
Powder Metallurgy Technique ◽  
Fabrication And Characterization ◽  
Compacting Pressure ◽  
Sem Microstructure ◽  
Scanning Electron

Porous F-75 (Co-Cr-Mo) was produced by powder metallurgy technique. F-75 powder was mixed with space holder and compacted using different pressures (300 MPa, 350 MPa, 400 MPa, 450 MPa). The green samples were sintered at 1150 °C in a tube furnace under argon atmosphere. Sintered samples were examined in terms of bulk density, porosity, hardness and pore size. Microstructural analysis was carried out using a scanning electron microscope (SEM). Microstructure analysis showed that pore sizes and pore shape were influenced by different compaction pressure. The hardness of the samples increased as compacting pressure increased. Density and porosity remained constant at certain level.

scholarly journals Effect of Alumina (Al2O3) Particles on The Mechanical Properties of Magnesium (Mg)

2019 ◽  
Vol 22 (2) ◽  
pp. 124-130
Author(s):  
Hayder Muneam Abed Zaid ◽  
Abdul Rahman N. Abed ◽  
Hala Salman Hasan
Keyword(s):  
Electron Microscopy ◽  
Volume Fraction ◽  
Rotation Speed ◽  
Energy Dispersive ◽  
Powder Metallurgy Technique ◽  
X Ray Diffraction ◽  
Magnesium Matrix ◽  
X Ray ◽  
Sem Image ◽  
Scanning Electron

In the present study, magnesium-based composites reinforced with different volume fractions (3, 5, 10, and 15) vol.% of micro sized Al2O3 particulates were fabricated by powder metallurgy technique which involves mixed, compacted and sintered. Powders were mixed by ball milling (without balls) for 6 hours at rotation speed 60 rpm. Then powder was compacted at 550 MPa and sintered at 530˚C for 2 hours. Microstructures of sintered composites have been investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) energy dispersive.  SEM image of sinter samples exhibit good bonding between the magnesium matrix and the alumina. The microhardness and wear resistance of micro composites has been improved significantly compared to that of pure magnesium. Highest value of microhardness is 97 HV at the volume fraction of 10 vol.% Al2O3.

Mechanical Response of Porous Copper Manufactured by Lost Carbonate Sintering Process

2007 ◽  
Vol 539-543 ◽  
pp. 1863-1867 ◽  
Author(s):  
X.F. Tao ◽  
Li Ping Zhang ◽  
Y.Y. Zhao
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Relative Density ◽  
Mechanical Response ◽  
Compaction Pressure ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Three Point Bending ◽  
Porous Copper ◽  
The Impact

This paper investigated the mechanical response of porous copper manufactured by LCS under three-point bending and Charpy impact conditions. The effects of the compaction pressure and K2CO3 particle size used in producing the porous copper samples and the relative density of the samples were studied. The apparent modulus, flexural strength and energy absorption capacity in three-point bending tests increased exponentially with increasing relative density. The impact strength was not markedly sensitive to relative density and had values within 7 – 9 kJ/m2 for the relative densities in the range 0.17 – 0.31. The amount of energy absorbed by a porous copper sample in the impact test was much higher than that absorbed in the three-point bending test, impling that loading strain rate had a significant effect on the deformation mechanisms. Increasing compaction pressure and increasing K2CO3 particle size resulted in significant increases in the flexural strength and the bending energy absorption capacity, both owing to the reduced sintering defects.

Structural Evaluation of Ti-22.2Si-11.1B Powders Milled with PCA Addition

2008 ◽  
Vol 591-593 ◽  
pp. 147-153
Author(s):  
Gilbert Silva ◽  
Erika Coaglia Trindade Ramos ◽  
N.S. da Silva ◽  
Alfeu Saraiva Ramos
Keyword(s):  
Electron Microscopy ◽  
Ball Milling ◽  
Ball Mill ◽  
Milling Process ◽  
Argon Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Evaluation ◽  
Equilibrium Structures ◽  
Scanning Electron

A large amount of the Ti6Si2B compound can be formed by mechanical alloying and subsequent heat treatment from the elemental Ti-22.2at%Si-11.1at%B powder mixture, but the yield powder after ball milling is reduced due to an excessive agglomeration of ductile particles on the balls and vial surfaces. This work reports on the structural evaluation of Ti-22.2at%Si-11.1at%B powders milled with PCA addition, varying its amount between 1 and 2 wt-%. The milling process was carried out in a planetary ball mill under argon atmosphere, and the milled powders were then heated at 1200oC for 1h under Ar atmosphere in order to obtain equilibrium structures. Samples were characterized by X-ray diffraction, scanning electron microscopy, and thermal analysis. Results revealed that the PCA addition reduced the excessive agglomeration during the ball milling of Ti-22.2at-%Si-11.1at-%B powders. After heating at 1200oC for 1h, the Ti5Si3, Ti3O and/or Ti2C phases were preferentially formed in Ti-22.2at%Si-11.1at%B powders milled with PCA addition, and the Ti6Si2B formation was inhibited.

scholarly journals Solid-liquid interface morphology of white carbide eutectic during directional solidification

2017 ◽  
Vol 62 (1) ◽  
pp. 365-368 ◽  
Author(s):  
M. Trepczyńska-Łent
Keyword(s):  
Longitudinal Section ◽  
Argon Atmosphere ◽  
Liquid Interface ◽  
Interface Morphology ◽  
Directionally Solidified ◽  
Constant Temperature Gradient ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Scanning Electron ◽  
Made In

AbstractIn this paper the analysis of solid-liquid interface morphology in white carbide eutectic was made. In a vacuum Bridgman-type furnace, under an argon atmosphere, directionally solidified sample of Fe - C alloy was produced. The pulling rate was v = 125 μm/s (450 mm/h) and constant temperature gradient G = 33.5 K/mm. The microstructure of the sample was frozen. The microstructure of the sample was examined on the longitudinal section using an light microscope and scanning electron microscope.

Effect of Sliding Speed on Tribological Properties of Microwave Sintered Copper-Graphite Composites

2014 ◽  
Vol 592-594 ◽  
pp. 1305-1309 ◽  
Author(s):  
K. Rajkumar ◽  
S. Aravindan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dry Sliding ◽  
Graphite Layer ◽  
Sliding Speed ◽  
Graphite Content ◽  
Sintered Copper ◽  
Pin On Disc ◽  
Graphite Composites ◽  
Scanning Electron

Effects of graphite content, and sliding speed on the tribological characteristics of copper-graphite composites under dry sliding condition were evaluated using a pin-on-disc tribometer. The worn surfaces of the composites were analyzed through Scanning Electron Microscopy (SEM). The experimental results revealed the improvement in wear resistance with increasing graphite content. The friction coefficient is also gradually decreasing upto 25 vol% graphite. Sliding speed has an effect on copper (5-15 vol%) graphite composites where as sliding speed has no effect in copper-(20-30 vol%) graphite composites. This difference is attributed to availability of self-lubricating graphite layer at the contact zone.

scholarly journals Curing and mechanical properties of chlorosulphonated polyethylene rubber blends

2011 ◽  
Vol 17 (3) ◽  
pp. 315-321 ◽  
Author(s):  
Gordana Markovic ◽  
Vojislav Jovanovic ◽  
Suzana Samarzija-Jovanovic ◽  
Milena Marinovic-Cincovic ◽  
Jaroslava Budinski-Simendic
Keyword(s):  
Mechanical Properties ◽  
Crosslink Density ◽  
Hydraulic Press ◽  
Elongation At Break ◽  
Rubber Blends ◽  
Tensile Tester ◽  
Roll Mill ◽  
Cure Time ◽  
Chlorosulphonated Polyethylene ◽  
Scanning Electron

In this paper the curing and mechanical properties of two series of prepared blends, i.e., chlorosulphonated polyethylene (CSM)/isobutylene-co-isoprene (IIR) rubber blends and chlorosulphonated polyethylene (CSM)/chlorinated isobutylene-co-isoprene (CIIR) rubber blends were carried out. Blends were prepared using a two roll-mill at a temperature of 40-50?C. The curing was assessed by using a Monsanto Oscillating Disc Rheometer R-100. The process of vulcanization accelerated sulfur of pure rubbers and their blends was carried out in an electrically heated laboratory hydraulic press under a pressure of about 4 MPa and 160?. The stress-strain experiments were performed using tensile tester machine (Zwick 1425). Results indicate that the scorch time, ts2 and optimum cure time, tc90 increase with increasing CSM content in both blends. The values of modulus at 100% and at 300% elongation and tensile strength increases with increasing CSM content, whereas elongation at break shows a decreasing trend. The enhancement in mechanical properties was supported by data of crosslink density in these samples obtained from swelling measurement and scanning electron microscopy studies of the rubber blends fractured surfaces.

Preparation of A14SiC4 by Solid-State Reaction

2011 ◽  
Vol 399-401 ◽  
pp. 817-821
Author(s):  
Xiao Hong Liu ◽  
Hui Wang ◽  
Ling Ke Zeng ◽  
Cheng Ji Deng
Keyword(s):  
Carbon Black ◽  
Raw Materials ◽  
Heating Temperature ◽  
Argon Atmosphere ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Higher Temperature ◽  
Flake Structure ◽  
Scanning Electron

In this paper, A14SiC4 was synthesized by using flint, aluminum and carbon black as raw materials，and they mass ratio was 28:50:22. The samples were fired at 1500°C、1600°C and 1700°C in an argon atmosphere. The phase compositions were determined by X-ray diffraction (XRD), the microstructures were examined by scanning electron microscope (SEM) and the elemental and quantitative compositions were determined by the energy dispersive X-ray spectroscopy (EDX). The results showed that the flint reacted with the carbon black, and produced Al2O3 and SiC firstly; meanwhile Al4C3 as intermediate product formed by the reaction between Al and C. Then a certain Al4C3 reacted with SiC, and produced A14SiC4; most Al4C3 reacted with the Al2O3, and produced Al4O4C at higher temperature. Subsequently, the Al4O4C and the SiC reacted with carbon black, and produced A14SiC4. The formed quantity of A14SiC4 increased as the heating temperature was raised, and crystal structure was the flake structure of 1-2μm thickness and about 10μm length. The formation mechanism of A14SiC4 was also discussed.

The Effect of Trans-Polyoctylene Rubber (TOR) as Compatibilizer on Recycled Nitrile Glove (NBRr) Filled Natural Rubber Compound: Tensile Test and Morphology Studies

2014 ◽  
Vol 679 ◽  
pp. 305-310
Author(s):  
M.H. Fatin ◽  
N.Z. Noimam ◽  
S.T. Sam ◽  
M.Z. Salihin ◽  
Z. Norhafizah ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tensile Test ◽  
Room Temperature ◽  
Rubber Compound ◽  
Surface Fracture ◽  
Elongation At Break ◽  
Roll Mill ◽  
Fine Size ◽  
Tensile Surface ◽  
Scanning Electron

Tensile test and morphology studies were performed to determine the influences of Trans-polyoctylene Rubber (TOR) as compatibilizer of NBRr filled ENR 50 with composition of 15 phr. Fine size (300μm-700μm) of NBRr was used as fillers. Both uncompatibilized and compatibilized NBRr/ENR 50 were prepared using two roll mill at room temperature with different php of 1.0, 1.5, 2.0, 2.5 and 3.0. It can be observed that tensile strength and modulus of elasticity were decreased as increased in TOR loading before started to increased at 1.5 up to 3.0. Meanwhile, the increment in the value of elongation at break when increased in the addition of TOR. The scanning electron microscopy (SEM) of the tensile surface fracture of increased TOR loading illustrated a better adhesion and dispersion in comparison of low amount of TOR loading.

Synthesis and characterization of sodalite as matrix for conditioning chloride spent salts from pyroprocesses

2009 ◽  
Vol 1193 ◽  
Author(s):  
G. De Angelis ◽  
I. Bardez-Giboire ◽  
M. Mariani ◽  
M. Capone ◽  
M. Chartier ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Sodium Aluminate ◽  
Argon Atmosphere ◽  
Synthesis And Characterization ◽  
Chloride Salt ◽  
X Rays ◽  
Density Measurements ◽  
Quality Product ◽  
Scanning Electron

AbstractTwo different methods have been used to synthesize sodalite for conditioning of chloride salt wastes coming from pyroprocesses: the first one, starting from kaolinite through the intermediate nepheline phase; the second one, starting from silica and sodium aluminate reagents, directly. The obtained products have been characterized by means of several analyses. In particular, different instrumental techniques – stereomicroscopy, scanning electron microscopy (SEMEDS), density measurements, thermogravimetric analysis, X-rays diffraction, FTIR spectroscopy – were performed revealing that the synthesis from kaolinite is the best method, provided that rigorous conditions are followed. The use of an argon atmosphere for the preparation of pellets of reagents is strictly necessary for the obtainment of a good quality product.

Sign in / Sign up

Export Citation Format

Share Document