Papers by Dr Nor hisham Mohd Nor
Scientific Research and Essays, 2011
The influence of temperature and powder loading on the Metal Injection Moulding (MIM) green compa... more The influence of temperature and powder loading on the Metal Injection Moulding (MIM) green compact is presented. The feedstock used is a mixture of stainless steel (SS316L) powder and a composite binder system consisting of polyethylene glycol (PEG) and polymethyl methacrylate (PMMA). The bimodal particle size distribution powder has a composition of 30 and 70% by weight of fine and coarse SS316L powder respectively with a powder loading of 64 and 65% by volume. The Battenfeld BA 250 CDC injection-moulding machine was used to produce a MIMA tensile specimen. The as-moulded density was measured using the Archimedes water immersion method according to the MPIF Standard 42. The injection temperature was varied from 120 to 150°C while the injection pressure remains at 350 bars. The three-point bending test was performed using INSTRON 5567 to measure the green strength according to the MPIF Standard 15. Results showed that the bi-modal feedstock with the higher powder loading was more s...
Metal Injection Molding (MIM) process has some features such as shape complexity, low production ... more Metal Injection Molding (MIM) process has some features such as shape complexity, low production cost and tight tolerance. The MIM process consists of four steps such as mixing, injection molding, debinding and sintering. These steps are dependent upon the types of binder used. Successful production of parts by MIM is closely related to the binder system utilized. The role of the binder is to serve as a temporary or transient phase to impart flowabiHty and moldability to the powder mixture. This will enable the shaping of the feedstock to the desired shape during injection molding.To have a good understanding of the MIM process and successful in manufacturing, characterisation of the material feedstock is essential. This paper presents the characterization of MIM feedstock consisting titanium alloy (Ti-6A1-4V) powder mix with binder 60wt% of palm stearin and 40wt% polyethylene. The characterisation of Ti-6A1-4V alloy powder, binders and feedstock includes scanning electron micrograp...
Jurnal Teknologi, 2012
The influence of the leaching temperatures on the solvent debinding process of ZK60 magnesium all... more The influence of the leaching temperatures on the solvent debinding process of ZK60 magnesium alloy compact has been investigated. In this experiment, the soluble binder, palm stearin molecules were extracted out from the compact parts by immersing the compact parts in an n-heptanes solution. The solvent debinding rate was then investigated under the conditions of different leaching temperatures. The weight loss percentages of palm stearin were calculated and the pore structure evolution was analyzed by scanning electron micrograph. Results show that a complete diffusion of the palm stearin molecules out of the compact part best at 600C within 4 hours of extraction time.
In this paper, the homotopy-perturbation method (HPM) is applied to obtain approximate analytical... more In this paper, the homotopy-perturbation method (HPM) is applied to obtain approximate analytical solutions for the Cauchy reaction-diffusion problems. HPM yields solutions in convergent series forms with easily computable terms. The HPM is tested for several examples. Comparisons of the results obtained by the HPM with that obtained by the Adomian decomposition method (ADM), homotopy analysis method (HAM) and the exact solutions show the efficiency of HPM.
Jurnal Teknologi, 2015
This paper presents an investigation on influences and multiple optimizations of wire-electrical ... more This paper presents an investigation on influences and multiple optimizations of wire-electrical discharge (WEDM) machining performances such as cutting rate, material removal, surface roughness and kerf width processed on titanium alloy material. The experimental studies were conducted under varying machining parameters namely pulse-off time, peak current, wire tension and wire feed. The experimental works were designed base on Taguchi design of experiment. The optimum multi-objective performance characteristics was determined using analysis of variance (ANOVA) coupled with grey relational analysis (GRA). ANOVA was used to study the significance of process parameters on grey relational grade which showed the most significant factor. The grey relational grade obtained from GRA was used to optimize the wire-electrical discharge machining process. To validate the findings, confirmation experiment had been carried out using the optimal parameters and the predicted results were found in...
Applied Mechanics and Materials, 2014
Debinding process of injection moulded Ti-6Al-4V feedstock was divided into two parts: solvent de... more Debinding process of injection moulded Ti-6Al-4V feedstock was divided into two parts: solvent debinding process to eliminate palm stearin (PS) and thermal pyrolysis to eliminate polyethylene (PE). Solvent debinding process used heptane at optimum temperature, 60°C to remove PS binder completely as temperature is the only parameter that can be optimized. Thermal pyrolysis parameters for removal of PE binder from the injected 65vol% Ti-6Al-4V feedstock have been optimized by using Taguchi method. Heating rate, temperature and time were the selected factors during experiment to be applied in the L9(34) Taguchi orthogonal array (OA) to find the best set of parameters to produce highest density of brown part. Thermal pyrolysis process was done at optimum parameters: heating rate: 5°C/min; temperature: 510°C; and time: 90 minutes. Analysis of Variance (ANOVA) was employed to find the best signal to noise ratio (S/N) to express the contribution of the factors towards quality characteristi...
Key Engineering Materials, 2010
Nowadays, micro metal injection molding has become among the promising method in powder metallurg... more Nowadays, micro metal injection molding has become among the promising method in powder metallurgy research to produce small-scale intricate part at an effective process and competitive cost for mass production. This paper investigated the optimization of highest green strength which plays an important characteristic in determining the successful of micro MIM. In this paper, stainless steel SS 316L with D50 = 5.96µm was used with composite binder, which consists of PEG (Polyethelena Glycol), PMMA (Polymethyl Methacrilate) and SA (Stearic Acid). Feedstock with 61.5% with several injection parameters were optimized which highly significant through screening experiment such as injection pressure(A), injection temperature(B), mold temperature(C), injection time(D) and holding time(E). Besides that, interaction effects between injection pressure, injection temperature and mold temperature were also considered to optimize in the Taguchi’s orthogonal array. Analysis of variance (ANOVA) in ...
Jurnal Teknologi, 2007
Kajian mengenai panel apit segi empat terdiri daripada dua bahagian. Dalam bahagian pertama, pres... more Kajian mengenai panel apit segi empat terdiri daripada dua bahagian. Dalam bahagian pertama, prestasi dan kelakuan panel apit segi empat yang dikenakan beban statik dikaji. Panel apit ini sokong oleh unit sokongan dan dikenakan bebanan dibahagian tengahnya dengan menggunakan penakuk separa bulat dan penakuk rata. Panel apit spesifik yang digunakan untuk projek ini ialah kepingan keluli lembut, foam PVC yang dinamakan R55 dan teras daripada busa poli uretana (PU). Tujuan kajian ini adalah untuk mendapatkan bukti secara eksperimen tentang corak serta jenis kegagalan panel apit segi empat yang dikenakan beban tumpu di tengah–tengahnya dan disokong pada setiap bucunya. Selepas ujian statik dilakukan, lengkungan bagi setiap panel ditentukan. Hubungan antara pertumbuhan kerosakan dan kelakuan kerosakan semasa ujian statik ke atas panel dikaji. Dalam bahagian kedua, ujian dinamik dijalankan untuk menentukan prestasi, kelakuan, dan kesan bagi jenis busa serta hubungan antara tenaga masukan ...
Pyrolysis is the thermal degradation of carbonaceous solid by heat in the absence of oxygen. The ... more Pyrolysis is the thermal degradation of carbonaceous solid by heat in the absence of oxygen. The feedstocks, such as biomass or solid wastes are heated to a temperature between 400 and 600°C, without introducing oxygen to support the reaction. The reaction produces three products: gas, pyro-fuel oil and char. This paper presents the techniques of producing pyro-oil from waste tires, as well as investigation of the fuel properties suitable for diesel engine applications. In this study, microwave heating technique is employed to pyrolyse the used rubber tires into pyro-oil. Thermal treatment of as received used rubber tires is carried out in a modified domestic microwave heated fixed bed technology. It has been found that, rubber tires, previously used by various researchers, are poor microwave absorbers. Studies have shown that an appropriate microwave-absorbing material, such as biomass char or activated carbon, could be added to enhance the pyrolysis process; thus producing the pyro-oil. The characteristics of pyro-oil, as well as the effect of microwave absorber on its yield, are briefly described in this paper. The temperature profiles during the microwave heating process are also illustratively emphasized. The study provides a means of converting scrap tires into pyro-oil and pyrolytic carbon black production. The proposed microwave thermal conversion process therefore has the potentials of substantially saving time and energy.
Pertanika Journal of …, 1999
Admin Login. Cadangan Model Teoritikal bagi Menilai Kecekapan Pelaburan dalam Pembangunan Tanah R... more Admin Login. Cadangan Model Teoritikal bagi Menilai Kecekapan Pelaburan dalam Pembangunan Tanah Rizab Melayu. Abdullah, Ahmad Zainuddin and Md. ... ID Code: 3220. Deposited By: Nur Izyan Mohd Zaki. Deposited On: 24 Nov 2009 15:40. ...
Journal of Applied Sciences, 2011
UNIVERSITI TEKNOLOGI MARA Digital Repository is powered by EPrints 3 which is developed by the Sc... more UNIVERSITI TEKNOLOGI MARA Digital Repository is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.
Ceramic open cell foam is proposed as an alternative structure in the automotive exhaust abatemen... more Ceramic open cell foam is proposed as an alternative structure in the automotive exhaust abatement system in the current work. Combination of zeolite and its interconnecting channels promote radial mixing and enhance turbulence which is highly desired in exhaust gas treatment. However, the associated pressure loss in the structure becomes a major limitation which may affect the overall engine performance. This paper addresses the pressure drop characteristic of alumina-zeolite porous ceramic (AZPC) filter and its effects towards engine performance. The filter employs polymeric sponge method to produce porous structure with a composition of 70 vol. % alumina and 30 vol. % of zeolite. Three filters were produced, namely the porous monolith, channelled porous monolith and cylindrical beads with the corresponding capacity for 1300 cc engine. Testing was conducted using a centrifugal blower having a flow rate up to 1224 m 3 /hour. Pressure difference for the filters were measured and compared to that of commercially available honeycomb monolith catalytic converter. The filters were then tested in the actual 1300 cc engine to determine the engine performance. Results show that the filters' backpressure is within the 400 and 500 cells per square inch (cpsi) of honeycomb monolith and only deviates slightly from the existing catalytic converter. The AZPC filters depict high potential capability as the pollutant abatement in the automotive application.
Jurnal Mekanikal, 2005
In this paper, the dynamic tests were conducted in order to determine the performance, mechanical... more In this paper, the dynamic tests were conducted in order to determine the performance, mechanical behaviour, effect of foam type and the correlation between input energy from static and dynamic tests. Emphasis is placed on assessing the failure modes occurred after the dynamic test and the comparison is made with the static test. Same type of failure behaviours were observed for the circular sandwich panels with different PU and R55 foam cores. The load versus displacement diagrams show that dynamic loading requires more ...
Kertas kerja ini akan membincangkan mengenai analisis terhadap serbuk SS316L pengatoman gas serta... more Kertas kerja ini akan membincangkan mengenai analisis terhadap serbuk SS316L pengatoman gas serta pengatoman air, kasar dan halus. Faktor-faktor seperti taburan saiz partikel (D 10 , D 50 , D 90); taburan lengkuk, S W ; dan luas permukaan tentu, S bagi serbuk tersebut dalam taburan monomodal dan bimodal dibincangkan dengan lebih terperinci dalam kertas kerja ini. Ini memandangkan faktor-faktor tersebut secara teorinya akan mempengaruhi proses-proses yang terdapat dalam proses penyuntikan acuan logam (MIM) ini, di samping kualiti jasad akhir yang bakal dihasilkan. Taburan bimodal akan mengubah saiz median partikel tersebut, selain taburan lengkuk, S W yang sempit akan memudahkan proses penyuntikan acuan logam dan, luas permukaan tentu, S yang lebih besar mempercepatkan proses penumpatan jasad sinter. Analisis ini mendapati bahawa saiz median serbuk, D 50 bagi kesemua serbuk yang digunakan akan meningkat apabila jisim serbuk kasar ditambah dalam adunan serbuk bimodal. Selanjutnya, analisis terhadap serbuk pengatoman air pula mendapati bentuk partikelnya yang tidak sekata dan berligamen akan mempercepatkan proses penumpatan jasad sinternya berbanding serbuk pengatoman gas. Ini disebabkan oleh luas permukaan tentunya, S yang lebih tinggi. Katakunci: Pengacuan suntikan logam (MIM); serbuk SS316L; taburan lengkuk (S W); luas permukaan tentu (S)
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Papers by Dr Nor hisham Mohd Nor