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.

Characterization and Properties of Copper-Silica Sand Nanoparticle Composites

2011 ◽  
Vol 319-320 ◽  
pp. 95-105 ◽  
Author(s):  
Tahir Ahmad ◽  
Othman Mamat
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Plastic Deformation ◽  
Powder Metallurgy ◽  
Silica Sand ◽  
Prealloyed Powder ◽  
Powder Metallurgy Process ◽  
Rearrangement Mechanism ◽  
Nanoparticle Composites ◽  
Metallurgy Process

Copper-based microcomposites fabricated by powder metallurgy with subsequent plastic deformation have received increasing attention over recent years. These microcomposites possess good electrical conductivity in combination with high mechanical properties. The present study aims to explore potential technical merits in developing a prealloyed powder metallurgy copper based composites with silica sand nanoparticles reinforcement. Relevant mechanical properties and electrical conductivity improvements are the main targets. A copper based composite with 5, 10, 15 and 20 wt.% of silica sand nanoparticles were developed through the powder metallurgy process. It was observed that by addition of silica sand nanoparticles with 20% increased the hardness up to 143HV. Optimum electrical conductivity of the composites was achieved in the 15 wt.% silica sand nanoparticles. Advanced particle rearrangement mechanism due to homogeneous and fine distribution of silica sand nanoparticles into pore sites of the composites was also observed. The silica sand nanoparticles composites properties that are much more surface-related seen to be improved convincingly compared with the bulk controlled.

Studying the Formation of Fe2SiO4 and Pearlite Phasesin Iron-Silica Sand Nanoparticle Composites

2013 ◽  
Vol 337-338 ◽  
pp. 39-47
Author(s):  
Tahir Ahmad ◽  
Othman Mamat ◽  
Rafiq Ahmad ◽  
Amir N. Malik
Keyword(s):  
Metal Matrix ◽  
Liquid Phase Sintering ◽  
Silica Sand ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Based ◽  
Nanoparticle Composites ◽  
Scanning Electron

Metal matrix composites have grown rapidly with their usefulness in many applications for industries. The present research aims to study the formation of Fe2SiO4 and pearlite phases, the reaction product of iron-silica sand nanoparticles composites. In this study iron based silica sand nanoparticles composite with 5, 10, 15 and 20wt.% of silica sand nanoparticles were developed using powder metallurgy technique being sintered at 1100°C. It was observed during the X-Ray Diffraction (XRD) and XPS analysis that the reaction between iron and silica sand nanoparticles forms the Fe2SiO4 phase. Field Emission Scanning Electron Microscopy (FESEM) analysis at higher magnification also reveals the formation of pearlite phase. The presence of liquid phase sintering is also observed with frozen liquid spots at microstructure of iron-silica sand nanoparticles reaction.

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.

Physico-Mechanical Properties of Sintered Iron-Silica Sand Nanoparticle Composites: A Preliminary Study

2012 ◽  
Vol 332 ◽  
pp. 7-16 ◽  
Author(s):  
Tahir Ahmad ◽  
Othman Mamat ◽  
Rafiq Ahmad
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Sintering Temperature ◽  
Milling Process ◽  
Silica Sand ◽  
Matrix Composites ◽  
Sintered Iron ◽  
Preliminary Study ◽  
Iron Based ◽  
Nanoparticle Composites

The present study aims to develop silica sand nanoparticles using the ball-milling process and to utilize these nanoparticles as reinforcement for iron-based metal matrix composites. Iron-based metal-matrix composites with 5, 10, 15 and 20wt.% of the processed silica sand nanoparticles were developed using powder metallurgy technique and sintered at 900°C, 1000°C and 1100°C. The results showed that the addition of silica sand nanoparticles to iron as reinforcement decreased the green density, albeit with an improvement in sintered densities. It was also observed that the increase in the sintering temperature results in an improvement of microstructure and microhardness of the composites. The maximum hardness of 168HV in iron-based composites was found with the addition of 20wt.% of silica sand nanoparticles at a 1100°C sintering temperature. It is proposed that the mechanism for the occurrence of this observed increment in microhardness is due to diffusion of silica sand nanoparticles into porous sites of the composites, resulting in the formation of FeSi phase.

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.

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