Wan Abdul Rahman Assyahid Wan Ibrahim, Dr.
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/39296
This page provides access to scholarly publications by UniMAP Faculty members and researchers2024-03-28T16:08:44ZOptimization of holding time on microwave irradiation of the composite iron-chromium reinforced with alumina particle
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/63582
Optimization of holding time on microwave irradiation of the composite iron-chromium reinforced with alumina particle
Wan Abdul Rahman Assyahid, Wan Ibrahim; Shamsul Baharin, Jamaludin; Mazlee, Mohd Noor
In this study, the effect of holding time on the microwave sintered 84Fe-11Cr-5Al2O3 metal matrix composite (MMC) was investigated. Sintering was carried out in a tubular microwave furnace HAMiLab-V3 under N2 atmosphere. The holding time was selected between 0 to 75 minutes with increment of 15 minutes respectively. A study of microstructure and physical properties was carried out on sintered samples. It was discovered that, when the samples sintered at 1400oC with 20oC/min heating rate, the hardness was significantly increased from 110Hv to 160 Hv for holding time ranging from 30 to 45oC/min. Further increment until 75 minutes of holding time, no significant changes were obtained and hardness values were at steady state. The enhancement of bulk density and reduction of porosity were observed commences at 30 minutes until 45 minutes holding time. However, the results showed that the optimum holding time was at 45 minutes where the micro hardness is at the highest point which is about 160Hv.
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2016-01-01T00:00:00ZMechanical properties of microwave sintered 60YSZAl₂0₃/10HAP bioceramics composites
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/43804
Mechanical properties of microwave sintered 60YSZAl₂0₃/10HAP bioceramics composites
Nurliyana, Mohd Rosli; Nur Maizatul Shima, Adzali; Wan Abd. Rahman Assyahid, Wan Ibrahim; Mohd Zamzuri, Mohammad Zain; Azmi, Harun
Microwave heating technology promising shorter processing times and less energy consumption beneficial for economic perspective with improved properties and better microstructural control. This study focussed on microwave sintered bioceramics material of 60YSZAl2O3/ 10HAP mixture fabricated by powder metallurgy route. The study was conducted based on three different sintering temperatures, starting with 900˚C, 1000°C ended with 1100°C. Mechanical properties of materials such as porosity, density, hardness and compressive strength were then determined for each composites. Results showed that lowest porosity was obtained at 1000°C which promoting to higher density, hardness and compressive strength. However, the increasing sintering temperature up to 1100 ˚C was initiated the decomposition of HAP and constitutes the formation of CaZrO3 determined by X-ray Diffraction (XRD) analysis. Microstructure characterization by Scanning Electron Microscope (SEM) observed the growth of large particles and pores result in excessive grain coarsening. Better sinterability was achieved through an adequate sintering temperature of 1000°C with no reaction reported between HA and ZrO2 during the sintering process facilitate by microwave hybrid heating. The pores was found to be interconnected for each composites via microwave heating expected to be useful for biomedical application which was favorable to osteo-integration.
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2014-01-01T00:00:00ZCharacterization of PM Fe-Cr-Y₂O₃ composites prepared by microwave sintering technology
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/32668
Characterization of PM Fe-Cr-Y₂O₃ composites prepared by microwave sintering technology
Marina, Marzuki; Mohd Zamzuri, Mohammad Zain; Mohd Nazree, Derman, Dr.; Mohd Asri, Selamat; Wan Abdul Rahman Assyahid, Wan Ibrahim; Nooraizedfiza, Zainon
This research is focused on assessing the feasibility of the new and innovative microwave sintering technology for fabricating iron-chromium composites prepared via powder metallurgy route. Accordingly, the microwave sintered iron-chromium compacts was benchmarked against conventional sintered counterparts fabricated in other researches. We also studied the viability of yttria reinforcement to the iron-chromium composites with varying weight fraction from 5 to 20 %. Comparison on the end properties were also being made on the unreinforced iron-chromium matrix (0 wt. % of yttria). The result revealed that the microwave sintered iron-chromium composites possess improved density and micro hardness value. Process evaluation also revealed that microwave assisted sintering can lead to a reduction of 70 % of sintering time when compared to conventional sintering. The micro hardness property of microwave sintered iron-chromium was slightly improved with 5 wt. % addition of yttria, although the density and compressive strength were reduced with increasing content of the ceramic particulates. Most importantly, the study has established the viability of microwave sintering approach used in place of conventional sintering for iron based powder metallurgy composites.
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2014-01-01T00:00:00ZOptimization of sintering temperature on microwave sintering of the composite iron-chromium reinforced with alumina particles
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/32664
Optimization of sintering temperature on microwave sintering of the composite iron-chromium reinforced with alumina particles
Wan Abdul Rahman Assyahid, Wan Ibrahim; Shamsul Baharin, Jamaludin, Prof. Dr.; Mazlee, Mohd Noor, Dr.
Microwave sintering technology has become attractive and gained interest among material researchers due its capability and advantages over conventional sintering. Since two decades ago, intensive researches on microwave sintering have been carried out to sinter ferrous and non ferrous material purposely to produce composites with enhanced properties not achievable via conventional sintering. In this research, the effect of sintering temperature on the microstructure and properties of the sintered 84Fe-11Cr-5Al2O3 composite was investigated. Sintering was carried out in a tubular microwave furnace HAMiLab-V3 under N2 atmosphere. The sintering temperatures were selected between 1100°C to 1400°C with increment of 100°C. A study of microstructure and physical properties was carried out on sintered samples. It was observed that, relative density and porosity was slightly changed with increasing sintering temperature and hardness increased tremendously at sintering temperature of between 1300oC to 1400°C.However, the results showed that the optimum sintering temperature was at 1400°C.
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2014-01-01T00:00:00Z