Browsing Khairel Rafezi Ahmad, Associate Prof Dr. by Issue Date

Now showing items 1-20 of 39

    • Effect of Inhibitors on the Corrosion of AISI-1018 Steel in Sea-Water Environment 

      Mohammed Misbahul, Amin; Khairel Rafezi, Ahmad (Research India Publications, 2008)
      The inhibitive properties of sodium benzoate for AISI-1018 steel controlling corrosion were studied in seawater environment at atmospheric condition. Three sets of solution were prepared with the concentrations of 0.3M, ...

    • Comparative study of corrosion behavior of AA2014/15 Vol%Al2O3p and AA2009/20 Vol% SiCw 

      Shamsul Baharin, Jamaludin; Z. Yusoff; Khairel Rafezi, Ahmad (Portuguese Electrochemical Society, 2008)
      The influence of heat treatment on the corrosion behavior of two aluminium matrix composites (AA2014/15 vol% Al2O3p - composite A and AA2009/20 vol% SiCw - composite B) was analyzed in 3.5% sodium chloride solution. The ...

    • The application of Fluidity Spiral in sand-mold casting 

      Mohd Ichwan, Nasution; Mohd Nasir, Zainal Arif; Che Mohd Ruzaidi, Ghazali; Shamsul Baharin, Jamaludin; Khairel Rafezi, Ahmad; Faizul, Che Pa; Mohd Fitri, Mohamad Wahid; Murizam, Darus (Universiti Kebangsaan Malaysia (UKM), 2008-12-03)
      The term fluidity is always used in the cast-metals industry. Fluidity is the reciprocal of viscosity. The foundryman job is to search the amount of quantity that will permit him to evaluate the relative ability of a given ...

    • The influence of welding parameters and corrosive environment on the joint strengh of resistance Spotwelded Mild Steel Sheets 

      Shamsul Baharin, Jamaludin; Ahmad Azid Tahar, Ahmad Latiffi; Khairel Rafezi, Ahmad; Md Fazlul, Bari (Universiti Kebangsaan Malaysia (UKM), 2008-12-03)
      In the present work, mild steel sheets consisting two batches were welded by resistance spot welding at different welding parameters and exposed under different environments. The 5% sodium chloride brine was used in the ...

    • Novel of Binary Metal-Non Metal Material for Chair Flower Product (Novel AI - PP for Chair Flower Product) 

      Mohd Ichwan, Nasution, Prof. Madya Ir.; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Shamsul Baharin, Jamaludin, Prof. Dr.; Che Mohd Ruzaidi, Ghazali, Prof. Madya; Khairel Rafezi, Ahmad, Dr.; Chek Idrus, Omar; Mohamed Faisol, Mohamed Nor; Mohamad Safwan, Isa (Universiti Malaysia Perlis, 2009)
      Material for aluminium product usually made from aliminium scrap. Nowadays, the price of aluminium scrap is increased. The idea is how to minimize the cost of production via minimize the weight of the product without ...

    • The influence of welding parameters and corrosive environment on the joint strength of resistance spot-welded mild steel sheets 

      Shamsul Baharin, Jamaludin; Ahmad Latiffi, A. A. T.; Khairel Rafezi, Ahmad; Fazlul, Bari (Universiti Malaya, 2009)
      In the present work, mild steel sheets consisting two batches were welded by resistance spot welding at different welding parameters and exposed under different environments. The 5% sodium chloride brine was used in the ...

    • The influence of welding parameters and corrosive environment on the joint strength of resistance spot-welded mild steel sheets 

      Shamsul Baharin, Jamaludin, Prof. Dr.; Ahmad Latiffi, A. A. T.; Khairel Rafezi, Ahmad; Md. Fazlul, Bari (University of Malaya, 2009)
      In the present work, mild steel sheets consisting two batches were welded by resistance spot welding at different welding parameters and exposed under different environments. The 5% sodium chloride brine was used in the ...

    • The effects of solutionizing temperatures on microstructures of as-received A357 alloy 

      Mazlee, Mohd Noor; Shamsul Baharin, Jamaludin; Shaiful Rizam, Shamsuddin; Mohabattul Zaman, SNS Bukhari; Khairel Rafezi, Ahmad; Raudhah, Othman (Universiti malaysia Perlis, 2009-12-01)
      Solution treatment has been carried out on as-received A357 alloy at two solution treatment temperatures of 530ºC and 550ºC for 11 hours. The microstructural study was performed by using optical microscope. Optical ...

    • Effect of age hardening on Aluminum alloys: a study of motorcycle piston 

      M.Z., Fizam; Khairel Rafezi, Ahmad; Ruhiyuddin, Mohd Zaki; Ruslizam Darus (Universiti Malaysia Perlis, 2009-12-01)
      This paper reported on the effect of age hardening on the aluminum alloys piston. These studies were carried out to improve the hardness of the aluminum alloys piston by using age hardening method. The AlSiCuMg alloys with ...

    • Chitosan pH Sensor 

      Irwana, Nainggolan, Dr.; Khairel Rafezi, Ahmad, Dr.; Tulus Ikhsan, Nasution (Universiti Malaysia Perlis, 2010-01-07)
      Chitosan is a natural biomaterial derived from the alkaline deacetylation of chitin that is present in many crustaceans, insects and mollusk shells.

    • Wettability, electrical and mechanical properties of 99.3Sn-0.7Cu/Si 3N4 novel lead-free nanocomposite solder 

      Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairel Rafezi, Ahmad, Dr.; Mohd Arif Anuar, Mohd Salleh; Muhammad Hafiz, Hazizi; Zainal Arifin, Ahmad, Prof. Dr. (Trans Tech Publications, 2011-07-04)
      A nanocomposite solder alloy with 99.3Sn-0.7Cu base alloy was successfully fabricated using the powder metallurgy route which consists of blending, compaction and sintering. Varying amount of nano size silicon nitride ...

    • Room temperature anodization of aluminum and the effect of the electrochemical cell in the formation of porous alumina films from acid and alkaline electrolytes 

      Alaba Oladeji, Araoyinbo; Azmi, Rahmat, Assoc. Prof. Dr.; Mohd Nazree, Derman, Dr.; Khairel Rafezi, Ahmad, Dr (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 ...

    • Aluminium - Polymer abs product 

      Mohd Ichwan, Nasution; Kamaruddin, Hussin; Shamsul Baharin, Jamaludin; Che Mohd Ruzaidi, Ghazali; Khairel Rafezi, Ahmad; Faizul, Che Pa; Chek Idrus, Omar (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 ...

    • Dry sliding wear behaviour of A390 hypereutectic (Al–Si) alloy 

      Riyadh A., Al-Samarai; Haftirman, Idrus; Khairel Rafezi, Ahmad, Dr.; Yarub, Al-Douri (Universiti Malaysia Perlis (UniMAP)Pusat Pengajian Kejuruteraan Mekatronik, 2012-02-27)
      The behavior of wear for dry alloy A390 of (aluminum–silicon) casting which constitutes 16% Si is investigated. The lost of the wear rate is weighted and the volume decreases with increasing speed of sliding as well as ...

    • Evaluate the effects of various surface roughness on the tribological characteristics under dry and lubricated conditions for Al-Si alloy 

      Riyadh A., Al-Samarai; Haftirman, Dr.; Khairel Rafezi, Ahmad, Dr.; Yarub, Al-Douri, Assoc. Prof. Dr. (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 ...

    • Fire resistance of biomass ash panels used for internal partitions in buildings 

      Roshazita, Che Amat; Norlia, Mohamad Ibrahim; Nur Liza, Rahim; Nur Saidatul Balqish, Ahmad Tajudin; Khairel Rafezi, Ahmad, Dr. (Malaysian Technical Universities Network (MTUN), 2012-11-20)
      constructions. This study develop new products made of by biomass ash from industry waste for the internal partitions panel. Modifying the internal partition panel of wall with addition of biomass ash (EFB) and clay soils ...

    • Effect of roughness of hypo-and hyper-eutectic Al-Si piston alloy on wear characteristics under lubrication 

      Riyadh A., Al-Samarai; Haftirman, Dr.; Khairel Rafezi, Ahmad, Dr.; Yarub, Al-Douri, Dr. (Malaysian Technical Universities Network (MTUN), 2012-11-20)
      The tribological behavior of tow AlSi alloys under the influence of surface roughness average was investigated for the present study. The silicon content of these alloys ranged 10 and 16-wt% Si, and includes hypoeutectic ...

    • Intermetallic compound formation on solder alloy/cu-substrate interface using lead-free sn-0.7cu/recycled-aluminum composite solder 

      Flora Somidin; Mohd Arif Anuar, Mohd Salleh; Khairel Rafezi, Ahmad, Dr. (Scientific.Net, 2012-12)
      Feasibility of using recycled-Aluminum (re-Al) as reinforcement particulates in Sn-0.7Cu is assessed by powder technology method, whereby re-Al particulates are produced from discarded aluminum beverage cans. This paper ...

    • Preparation and characterization of silica aerogel immobilized with cyanex 301 for extraction of Zn(II) 

      Mst. Noorzahan, Begum, Dr.; Md Fazlul, Bari, Dr.; Salmie Suhana, Che Abdullah; Khairel Rafezi, Ahmad, Dr.; Nasim, Ahmed, Dr. (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 ...

    • Kinetic and thermodynamic studies on adsorption of copper ions onto pomelo peel (citrus grandis) 

      Mst. Noorzahan, Begum, Dr.; Aimi Noorliyana, Hashim; Md Fazlul, Bari, Dr.; Norzilah, Abdul Halif, Dr.; Nur Hidayah, Ahmad Zaidi; Khairel Rafezi, Ahmad, Dr. (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 ...