Khairel Rafezi Ahmad, Associate Prof Dr.
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This page provides access to research works by Khairel Rafezi Ahmad,Associate Prof Dr. currently a Senior Lecturer of School of Materials Engineering, Universiti Malaysia Perlis (UniMAP).
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Skills and Expertise: Materials Engineering, Ceramic & Composite, Composite Material, Mechanical Properties, Material Characterization, Materials, Mechanical Behavior of Materials, Powder Metallurgy, Materials Processing, Metallurgy, Metallurgical Engineering, Ceramic Engineering, Mechanical Testing, Wear, Hardness Tests
Recent Submissions
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Aluminium - Polymer abs product
(Universiti Malaysia Perlis (UniMAP), 2012)Material used for aluminium product usually made of aluminium scrap. Currently, the price of aluminium scrap is increase. It is necessary to minimize the cost of production by reducing the weight of the aluminium product ... -
Preparation of colossal magnetoresistance ploycrystalline via sol-gel technique: a short review
(Trans Tech Publications, 2013)This paper presents a short review of research work on the development of synthesizing the colossal magnetoresistance materials through sol-gel method. Although there are a lot number of methods available, sol-gel method ... -
Effect of temperature of oxalic acid on the fabrication of Porous anodic alumina from Al-Mn alloys
(Hindawi Publishing Corporation, 2013)The influence of temperature of oxalic acid on the formation of well-ordered porous anodic alumina on Al-0.5 wt% Mn alloys was studied. Porous anodic alumina has been produced on Al-0.5 wt% Mn substrate by single-step ... -
Room temperature anodization of aluminum and the effect of the electrochemical cell in the formation of porous alumina films from acid and alkaline electrolytes
(VBRI Press, 2012)Nanoporous alumina was produced by anodic oxidation of aluminum in both acidic and alkaline electrolytes. Previous reports indicate that nanoporous aluminais mainly produced from strongly acidic electrolytes, and with the ... -
A simple one-step anodising method for the synthesis of ordered porous anodic alumina
(Taylor & Francis, 2014)Porous anodic alumina (PAA) has been produced on aluminium substrate by single-step anodising at 50 V in 0.3 M oxalic acid at 15°C for 60 min. The highly ordered pore and cell structure was achieved by subjecting the PAA ... -
The role of direct chilling, retrogression and reaging treatment on mechanical properties of high strength aluminum alloy
(Trans Tech Publications, 2013-03)The effect of retrogression and reaging heat treatment on microstructure evolution andmechanical properties of 7075 Al alloy in direct chilling casting process was investigated. The subsequent heat treatment process comprised ... -
Sintering effects on mechanical properties of Co-HA composite prepared by modified electroless deposition.
(Trans Tech Publications, 2014)Co-HA composite produced using electroless deposition without conventional sensitization and activation treatment was studied with varying sintering temperature (1100°C, 1200°C and 1250°C). The particles size, bulk density, ... -
Effect of different nickel content on the mechanical properties of hydroxyapatite-ni composites from coated powders
(Trans Tech Publications, 2014)HA-Ni composites were fabricated by uniaxial pressing from coated powders, in which HA particles were successfully coated with nickel precursor by the electroless deposition method. The compacted powders sintered at ... -
Development of dense hydroxyapatite-ni by modified electroless deposition technique.
(Trans Tech Publications, 2014)Ni deposited on HA powder was prepared by electroless plating process without sensitization and activation treatment. The deposited powder obtained was characterized by energy dispersive spectroscopy (EDX) and x-ray ... -
Preparation and characterization of Co-HA powder using modified electroless method
(Trans Tech Publications, 2014)C0-HA composite produced by simple electroless deposition method was studied. From the particle size analysis by Malvern particles analyzer its shows that 19% increment in average of the particle size powder increase after ... -
Evaluate the effects of various surface roughness on the tribological characteristics under dry and lubricated conditions for Al-Si alloy
(Scientific Research Publishing Inc. All rights reserved., 2012-07)The effect of surface roughness average of hypereutectic aluminum silicon alloys (with 16 wt% Si) on the friction and wear was investigated. Various surface roughness average (Ra) of different degrees was verified as well ... -
Mechanical properties of dissimilar welds between stainless steel and mild steel
(Trans Tech Publications, 2013)Joining of stainless steel type 304 to mild steel was carried out using a gas tungsten arc welding (GTAW). Samples were welded using stainless steel welding electrode: (AWS: E308l-16) and mild steel welding electrode: (AWS: ... -
Effect of spot welding current and cycles on the mechanical properties of welded galvanized steel sheets
(Trans Tech Publications, 2013)Studies on the effects of welding current and cycles were carried on the galvanized steel sheets using spot welding. The welding currents used were 3 kA, 5 kA 6 kA and the welding cycles were 4, 6 and 8. Tensile shear and ... -
Kinetic and thermodynamic studies on adsorption of copper ions onto pomelo peel (citrus grandis)
(Trans Tech Publications, 2013)The ability of pomelo peel (PP) as natural adsorbent to remove Cu (II) ions from aqueous solution was investigated. The influence of solution pH, contact time and temperature were evaluated. Cu (II) removal increased as ... -
Preparation and characterization of silica aerogel immobilized with cyanex 301 for extraction of Zn(II)
(Trans Tech Publications, 2013)A new solid phase extractant silica aerogel immobilized with Cyanex 301 {bis(2,4,4- trimethylpentyl) dithiophosphinic acid} (SAWC) was prepared via a sol- gel method and investigated for the extraction of Zn(II) from aqueous ... -
Using gibbs standard state free energy and a power regulating device to predict and control the fabrication of nanoporous alumina
(VBRI press, 2013-12)The basic concept of Gibbs standard state free energy predicts a favorable condition for both room and high temperature fabrication of nanoporous alumina in phosphoric acid electrolyte. The anodization of aluminum foil in ... -
Organic dye degradation with TiO2 catalyst/AAO template in the presence of H2O2
(Trans Tech Publications, 2013)In this study, anodic aluminum oxide (AAO) fabricated from phosphoric acid electrolyte at ambient temperature was used as the porous template, while a sol gel procedure was used for the preparation of the TiO2 sol with the ... -
Electrochemical measurement of PBS using cyclic voltammetry and AAO fabricated at ambient temperature and low potential
(Trans Tech Publications, 2013)Anodic aluminium oxide fabricated at ambient temperature and low potential in phosphoric acid electrolyte was used as the working electrode for the electrochemical measurement of phosphate buffer saline under different pH ... -
Synthesis and characterization of iron produced from iron mill scale
(Trans Tech Publications, 2014-01)In this project, iron mill scale has been used to produce iron powder that can be used within the Powder Metallurgy process. To achieve this objective, the iron mill scale needs to be refined. This involve the work of ... -
Tribological properties of WS2 nanoparticles lubricants on aluminum-silicon alloy and carbon steels
(Walailak University, 2013-06)The rheological properties of nanometric tungsten disulphide (WS2) nanoparticles oil lubricants and its tribological performance with two hypereutectic Al-Si alloy and carbon steel are examined. These two oils are used to ...
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