Ramdziah Md Nasir
@mechanical.eng.usm.my
Senior Lecturer and School of Mechanical Engineering
Universiti Sains Malaysia
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
M.H. Zul, Mahadzir Ishak@Muhammad, R.M. Nasir, M.H. Aiman, and M.M. Quazi
Universiti Malaysia Pahang Publishing
The need for titanium and its alloys has led to a significant increase in commercial manufacturing, although this material’s poor tribological qualities have been a drawback. The present study was to determine the effect of laser-textured surfaces to enhance Ti6Al4V surface wear performance. The sample underwent laser texturing based on pre-set parameter values at 15 W power at a laser scanning speed of 200 mm/s with a frequency of 50 kHz. The surface morphological and topological profile of laser-textured Ti6Al4V was characterized with also the surface microhardness. A comparative appraisal of wear rate (WR) and coefficient of friction (COF) for related samples of as-received Ti6Al4V and laser-textured Ti6Al4V was performed under dry and oil sliding conditions. The results revealed that the formation of oxidation due to the frictional force and plastic displacement plays a role of abrasive to the laser-textured surface and may result in increasing the COF. The wear rate of the laser-textured surface of Ti6Al4V exhibited 88.31% improvement compared to the as-received Ti6Al4V in the dry sliding wear test. It was proved that Ti6Al4V could benefit from LST to gain effectively enhanced wear performance.
Muhamad Syukri Mohamed Shamsuddin, Ainur Hanim Othman, Ramdziah Md Nasir, Aziz Hassan, Rozaimi Senawi, Mohd Zharif Ahmad Thirmizir, and Zainal Arifin Mohd Ishak
Wiley
AbstractThe objective of this research was to study the effects of polytetrafluoroethylene (PTFE) as a solid lubricant on the mechanical, electrical, and tribological properties of carbon fiber (CF)‐reinforced polycarbonate (PC) composites. Samples were prepared by means of single‐screw extrusion and injection molding processes. The mechanical tests included tensile, flexural, and failing weight impact tests, while the electrical tests consisted of surface and volume resistivity tests. The tribological testing was conducted under dry sliding conditions using pin‐on‐disk configuration. The results showed that the addition of CF managed to significantly reduce the electrical resistivity as the CF loading approached 10–15 wt%. The addition of PTFE managed to reduce the resistivity of the composite, that is, from 4.51 to 0.53 × 10 (Ωcm). The incorporation of 15 wt%. CF resulted with an increase of 45% in tensile strength and 51.5% in flexural strength, while the addition of PTFE had a negative impact on both properties. It was shown that PTFE was able to reduce the friction coefficient, μ and wear rate, K up to 0.257 and 6.35 × 106 (mm3/Nm), respectively, which can be attributed to the excellent abilities of PTFE to form transfer film. The composite consisting of 15 wt% CF and 10 wt%. PTFE showed highest improvement in term of electrical resistivity, and is deemed the most suitable composition for this study. Scanning electron microscopy was also carried out to further elucidate the fracture and wear mechanism of the PC/CF/PTFE composites.
M.N. Derani, M.M. Ratnam, and R.M. Nasir
Elsevier BV
M. S. M. Shamsuddin, R. M. Nasir, Aziz Hassan, and Z. A. Mohd Ishak
AIP Publishing
The objective of this research article is to study the mechanical and tribological properties of polytetrafluoroethylene filled carbon fiber reinforced polycarbonate (SCF/PC/PTFE) composites. The mechanical test include tensile and flexural properties. The fiber length distributions were conducted using acid digestion method, while the tribology test using pin-on-disk configuration. Several composition of PC based matrix with SCF as the reinforcement and PTFE as the dispersed phase were studied. The samples were prepared by mean of single screw extrusion and injection molding processes. The results showed that as CF are added, tensile and flexural strength increases. Whilst the addition of PTFE shows negative impact on both tensile and flexural. its influence on wear rate and coefficient of friction is very promising. The incorporation of CF and PTFE into PC show effective tribology-improving capabilities. The combinative effect of CF and PTFE are shown to be able to further enhance the friction and wear properties of PC matrix.
R MD Nasir, C F Ru, and R K Shuib
IOP Publishing
Abstract Magnetorheological effect on mechanical properties of its specific applications has been studied. Mechanical properties such as hardness, tribology characteristic and salt water and water absorption with hygrothermal effect will be further studied on wear performance of MRE on marine equipment applications. Isotropic, anisotropic and anisotropic with added N330 carbon black filler of Ni Zn Ferrite Magnetorheological Elastomers (MREs) were prepared with Ni Zn Ferrite filler, Ni1 - xZnxFe2O4 particles weight fraction of 70%. Images of Scanning Microscopy Electron (SEM) and Energy Dispersive X-Ray Analysis (EDX) are identified with the presence of the structure of Ni Zn Ferrite in the natural rubber matrix. Anisotropic Ni Zn Ferrite MREs with added carbon black filler given highest hardness value of 90.78; least effected on salt water and water absorption and hygrothermal effect; better wear performance with a low average specific coefficient of friction(COF), specific wear rate and least loss of wear volume. Therefore, it is most suitable use for future application in a wet environment for a long period.
Muthuvel Sattanathan, Shanmugan Subramani, Khairudin Mohamed, Mutharasu Devarajan, and Ramdziah Md Nasir
Springer Science and Business Media LLC
Norfazillah Talib, , Ramdziah Md. Nasir, Erween Abd. Rahim, , and
Penerbit UTHM
Bio-based oil from vegetable oils was recently explored as an alternative solution to petroleum-based oil. However, the application of vegetable oils as metalworking fluids (MWFs) for machining process is still not widespread. The objective of this study was to investigate the tribological behaviour of modified vegetable oils, in comparison with synthetic ester (SE) and crude jatropha oil (CJO). In this study, the CJO was chemically modified via transesterification process to develop modified jatropha oil (MJO5). MJO5 was then blended with the hexagonal boron nitride (hBN) particles at various concentrations ranging between 0.05 to 0.5wt.%. The friction and wear test was performed using four ball tribotester. An experiment on orthogonal cutting process was carried out to evaluate the machining performances in terms of cutting force, cutting temperature, chip thickness and tool-chip contact length. The results reveal that the mixture of 0.05wt.% of hBN particles in the MJO5-based oil (MJO5a) outperformed the SE in terms of friction and wear. MJO5a showed excellent machining performances by reducing the machining force and temperature, which related to the formation of thinner chips and small tool-chip contact length. MJO5a is the best substitute to SE as sustainable MWFs in the machining operation with regards to the environmental and health concern.
Norfazillah Talib, Erween Abd. Rahim, and Ramdziah Md. Nasir
Author(s)
A. N. Md Idriss, M. A. Maleque, I. I. Yaacob, R. M. Nasir, S. Mridha, and T. N. Baker
Informa UK Limited
ABSTRACT The work aimed to develop surfaces that could resist wear at high temperatures, thus achieving a prolonged component life. Surface modification of a low-alloy steel by incorporating TiC particles has been undertaken by melting the surface using a tungsten inert gas torch. The dry sliding wear behaviour at 600°C of the original and modified surfaces was compared. Microscopic examination of both surfaces showed glazed layers across the wear tracks, with differing amounts of oxide and homogeneity. Extensive wear occurred on the steel surface, which showed deformation of the wear scar tracks and a steadily increased friction coefficient. The TiC addition reduced the wear loss, coinciding with a glazed layer 33% thinner than that on the low-alloy steel sample.
N. Talib, R.M. Nasir, and E.A. Rahim
Elsevier BV
Boon Peng Chang, Yik Fong Yong, Hazizan Md Akil, and Ramdziah Md Nasir
Trans Tech Publications, Ltd.
This study examined the optimal abrasive wear performance of kenaf-reinforced polymer composite under different sliding conditions. Three different fiber loadings i.e. 43.05, 49.30 and 55.33 vol.% of kenaf fiber was reinforced into a polyester resin using the pultrusion technique. Optimal responses of wear rate and average coefficient of friction (COF) for kenaf fiber-reinforced polyester composites, based on different levels of control factors (fiber loading, applied load, counterface roughness and sliding speed) were determined by the Taguchi Design of experiment (DOE) with L9 (34) orthogonal array and Analysis of variance (ANOVA) methods. The wear behaviour of kenaf fiber-reinforced composites were investigated using DUCOM pin-on-disc tester with three levels of applied loads (10-30 N), sliding speeds (0.42-1.3 m/s) against different grit sizes of silicon carbide abrasive papers (average grain size~2.2-25.2 μm) under dry sliding condition. The optimization of S/N ratio and degree of significance of the control variables to minimize the wear rate and average COF of kenaf fiber-reinforced polyester composites was carry out. The results showed that the counterface roughness is the most significant factor in affecting the wear rate, followed by applied load, sliding speed, and fiber loading. For average COF, the fiber loading is the most significant factor followed by applied load, sliding speed and counterface roughness.
A. N. Md Idriss, M. A. Maleque, I. I. Yaacob, R. M. Nasir, S. Mridha, and T. N. Baker
Informa UK Limited
A comparison of the room temperature wear behaviour of untreated low alloy steel surfaces with those containing TiC powders was conducted against an alumina ball. The coefficient of friction, the wear rate and the severity of the damage on the surface were assessed. Incorporation of powders produced a hardness 2.6 times greater and a wear rate 21 times less than the untreated steel. Friction from the third body abrasion and protruding carbides of the processed steel resulted in mild wear with a steady state coefficient friction of 0.4. Both samples showed surface chemical reactivity with the environment as a result of the generation of flash temperature producing an oxide layer, which influenced wear.
Boon Peng Chang, Hazizan Md Akil, Ramdziah Bt Nasir, and Abbas Khan
Elsevier BV
Peng Chang Boon, Hazizan Md. Akil, and Ramdziah Md. Nasir
Penerbit Universiti Kebangsaan Malaysia (UKM Press)
As of today, ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic material normally used as bearing components for human joint replacements. However, formation of wear debris from UHMWPE after certain service periods may cause adverse effects which remain as unresolved issues. In this study, mechanical and dry sliding wear properties of UHMWPE reinforced with different loading of talc particles were investigated. The wear test was carried out using Ducom TR-20 pin-on-disc tester at different pressure velocity (pv) factors under dry sliding conditions. The worn surfaces and transfer films of pure UHMWPE and talc/UHMWPE composites were observed under scanning electron microscope (SEM). The experimental results showed that the microhardness increased with the increase of talc loadings in UHMWPE. The 20 wt. % talc/UHMWPE composites showed a 17% increment in microhardness as compared with pure UHMWPE. The dry sliding wear behaviour of UHMWPE was also improved upon the reinforcement of talc. The wear rate of UHMWPE decreased after incorporation of talc particles. The coefficient of friction (COF) increased slightly under low pv conditions. At high pv conditions, the COF decreased in values with increasing talc loadings. The improvement in wear behaviour may be attributed to the increase in load-carrying capacity and surface hardness of the talc/UHMWPE composites. SEM micrographs on worn surfaces showed that plastic deformation and grooving wear were dominant for UHMWPE. The plastic deformation and grooving wear were reduced upon the reinforcement of talc particles. The talc/ UHMWPE composites produced smoother and uniform transfer films as compared to pure UHMWPE.
Boon Peng Chang, Hazizan Md Akil, Muhammad Ghaddafy Affendy, Abbas Khan, and Ramdziah Bt Md Nasir
Elsevier BV
Abu Seman Anasyida, Zuhailawati Hussain, Ramdziah Md. Nasir, and S.L. Joy-Yii
Trans Tech Publications, Ltd.
In this study the effect of cerium addition on the microstructure of hypereutectic Al-15Si alloy was investigated. Experiments have been conducted on Al15Si alloys with Ce content in the alloy varied from 0 to 2.51 wt.%. The alloys were produced by casting in a permanent mould. Optical microscopy, X-Ray Diffraction (XRD) and Vickers microhardness were used in this investigation. The results showed that the addition of 0 to 2.5 wt.% of cerium led to the formation of precipitation of rod-like Al3Ce phase in the Al-matrix. The microhardness of the alloys increases with the increase in cerium content as a result of the Al3Ce precipitation.
Boon Peng Chang, Hazizan Md Akil, Ramdziah Bt Md Nasir, I. M. C. C. D. Bandara, and Sanath Rajapakse
SAGE Publications
In this study, the response of different filler loadings (5–20 wt%) of zinc oxide nanoparticles reinforced ultra-high molecular weight polyethylene on the mechanical, tribological and antibacterial performances were attempted. The compression, tensile and micro-hardness properties of the nano-zinc oxide/ultra-high molecular weight polyethylene composites were studied. The tribological properties were investigated using DUCOM pin-on-disc tester with variable applied loads (5–35 N) and sliding speeds (0.209 m/s and 0.419 m/s) against 1200 grit size silicon carbide abrasive paper under dry sliding conditions. The worn surfaces and transfer films of the composites were observed using the scanning electron microscopy. Experimental results show that reinforcing ultra-high molecular weight polyethylene with zinc oxide nanoparticles would improve certain mechanical and tribological properties. Wear performance was enhanced with maximum wear resistance found at 10 wt% nano-zinc oxide/ultra-high molecular weight polyethylene composite. The average coefficient of friction of ultra-high molecular weight polyethylene shows a decrease after reinforcement with zinc oxide nanoparticles. Upon zinc oxide nanoparticles reinforcement, the worn surface shows reduced severity of wear. The nano-zinc oxide/ultra-high molecular weight polyethylene composite imparts antibacterial activity against Escherichia coli and Staphylococcus aureus.
Siti Shuhadah Mohd Saleh, Hazizan Md Akil, Ramdziah Md. Nasir, Muhammad Razlan Zakaria, and Muhammad Helmi Abdul Kudus
Trans Tech Publications, Ltd.
Carbon nanotubes-talc (CNTs-talc) hybrid compound has been successfully synthesized via chemical vapour deposition (CVD) method. A gas mixture of methane/nitrogen (CH4/N2) was used as the carbon source and nickel as the metal catalyst for the growth of CNT hybrid compound. Talc works as substrate or support material which is combined with nickel to form a complex metal-talc catalyst that will react with carbon source to produce the hybrid compound. To study the effect of different calcinations temperature, four different calcinations temperature, 300 °C (C-talc300), 500 °C (C-talc500), 700 °C (C-talc700) and 900 °C (C-talc900) were used. Among these four calcination temperatures for synthesis the multi-walled carbon nanotubes (MWCNTs), C-talc500 is the most optimum calcination temperature to perform catalytic decomposition by reacting in methane atmosphere at 800 °C to produce the CNT-talc hybrid compound.
Boon Peng Chang, H.M. Akil, R.M. Nasir, and S. Nurdijati
Wiley
In this work, the response of different filler loading of zinc oxide (ZnO) reinforced ultra-high-molecular-weight polyethylene (UHMWPE) on mechanical, abrasive wear, and antibacterial properties were studied. Two variants of untreated ZnO-reinforced UHMWPE (U-ZPE) and treated ZnO-reinforced UHMWPE (T-ZPE) with aminoproplytriethoxysilane (APTES) were used to compare the improvement of the mechanical, abrasive wear, and antibacterial properties. The abrasive wear and friction behaviors were monitored using a pin-on-disc (POD) test rig with different applied loads and sliding speeds against 400-grit size of silicon carbide (SiC) abrasive paper under dry sliding conditions. The antibacterial assessments of the composites were tested against two common human body bacteria, that is, Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). Results have shown that T-ZPE possess higher ultimate tensile strength and elongation at break values as compared to U-ZPE. Furthermore, the T-ZPE have higher wear resistance compared to U-ZPE and pure UHMWPE. The average coefficient of friction (COF) of UHMWPE was not significantly affected by the addition of both untreated and treated ZnO filler. The wear mechanisms were studied under scanning electron microscopy (SEM). Both U-ZPE and T-ZPE composites showed active inhibition against E. coli and S. aureus bacteria. POLYM. COMPOS., 34:1020–1032, 2013. © 2013 Society of Plastics Engineers
Boon-Peng Chang, Hazizan Md. Akil, and Ramdziah Bt. Md. Nasir
Elsevier BV