Papers by Dr. Majid Karimian
Page 1. v EFFECTS OF PROCESS PARAMETERS ON LOST FOAM CASTING OF Al-Si (LM6) ALLOY MAJID KARIMIAN ... more Page 1. v EFFECTS OF PROCESS PARAMETERS ON LOST FOAM CASTING OF Al-Si (LM6) ALLOY MAJID KARIMIAN A thesis submitted in fulfillment of the requirements for the award of the degree of Doctor of Engineering (Mechanical Engineering) Faculty of Mechanical Engineering Universiti Teknologi Malaysia AUGUST 2011
2013 International Conference on MEMS and Mechanics, 2013
7th international material technology conference & exhibition IMTCE , 2010
roughness International conference on design and concurrent engineering 2010 IDECON, 2010
International conference on mechanical, industrial and manufacturing engineering (MIMT 2011) , 2011
The paper presents the result of an experimental investigation conducted on medium aluminum silic... more The paper presents the result of an experimental investigation conducted on medium aluminum silicon alloy casting- LM6, using no-vacuum assisted lost foam casting process. The study is directed for establishing the relationship between the flask vibrations times developed for molded sample on the casting integrity, surface penetration and coating inclusion defects of the casting. Four different flask vibration times namely 180, 120, 90 and 60 sec. were investigated. The casting integrity was investigated in terms of fulfilling in all portions and edges. The surface penetration was measured using optical microscope whilst image analyzer was used to quantify the percentage of coating inclusion in the casting. The results show that vibration time has significant influence on the fulfilling as well as the internal integrity of the lost foam casting. It was found that the lower vibration time produced comparatively sound casing.
Poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-HFP)/ionic liquid (IL) (1-butyl-3-methylimi... more Poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-HFP)/ionic liquid (IL) (1-butyl-3-methylimidazolium tetrafluoroborate, [BMIM][BF 4 ]) polymeric gels were prepared by cooling method under 0.2, 250, 500, and 750 MPa, respectively. The gel structure and electrochemical property were characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), complex impedance spectroscopy (CIS), and cyclic voltammetry (CV). It was found that the phase structure of PVdF-HFP/ [BMIM] [BF 4 ] gel became more orderly while the fracture surface became more irregular with the pressure increasing. FT-IR spectroscopy revealed that ionic liquid (IL) partly complexed with the polymer PVdF-HFP and partly remained dispersed in the matrix, and the relative ratio of them could be changed by high pressure. The ionic conductivity of PVdF-HFP/[BMIM] [BF 4 ] gel was increased with the pressure increasing below 500 MPa, however, decreased from 500 to 750 MPa, which was similar to variation of the amount of uncomplexed IL. It was attributed to the effect of high pressure on ionic density and gel structure of polymer-IL gel. These results indicated that the gel formation under high pressure might be another promising way to prepare IL-GPEs with excellent properties.
Journal of Iron and Steel Research International, 2010
Two gating systems namely stepped and tapered runners were used to cast strip samples with differ... more Two gating systems namely stepped and tapered runners were used to cast strip samples with different thicknesses by CO2/silicate process using sand grain sizes of AFS 151 and 171. To assess the effect of mould coating on the properties of thin-wall ductile iron, half of the moulds were coated whilst the rest were not coated. Molten metal with the carbon equivalent of 4.29% was prepared and poured at 1 450 °C. Microstructure of the specimens was analyzed by optical and scanning electron microscopes. Count, area fraction, roundness and diameter of the graphite nodules of the samples were measured by image analyzer. Brinell hardness and tensile tests of all the samples were also conducted. The results show that by using stepped runner gating system with uncoated and coarse sand mould, roundness and count of the graphite nodules decrease whereas diameter and area fraction increase. Although fine sand and coated mould cause longer distance of molten metal travel, hardness and strength of the samples decrease.
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Papers by Dr. Majid Karimian