Noh Dalimin

Publications (2) View all

• Article: The Sintering Temperature Effect on the Shrinkage Behavior of Cobalt Chromium Alloy

  Jamil M.Mahadi.A, S. Bahrin Jamaludin, A. Mujahid A. Zaidi, N. Hidayah A. Zaidi, M. Noh Dalimin, M. Ghazali Kamardan
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  ABSTRACT: Problem Statement: Co-Cr based alloys which is well known for its high Young’s modulus, fatigue strength, wear resistance and corrosion resistance is an important metallic bio-material. However, till date there are only two type of Co-Cr alloy which are the castable and wrought cobalt alloy. Powder Metallurgy route for cobalt is expected to give better result of Co-Cr alloy. The purpose of this research was mainly to study the sintering temperature effect to the shrinkage behavior of Cobalt Chromium (Co-Cr) alloy of the powder metallurgy route. Approach: Co-Cr was produced following P/M route under sintering temperature of 1000, 1100, 1200, 1300 and 1400<SUP>o</SUP>C. The sintering time was fixed at 60 min. Several tests has been conducted to determine this effect such as the rate of shrinkage measurement, the bulk density and porosity percentage measurement, compression and hardness tests and micro structural study. Result: From the study, it was found that the sintering temperature has caused the shrinkage of Co-Cr. The increasing of the sintering temperature has caused to the increasing of shrinkage of Co-Cr. This has resulted to the reduction of the pore volume and hence increased it density. In conjunction to that, the strength and the hardness of Co-Cr was increased. Conclusion: Therefore, it is hope that it will bring new view of powder metallurgy Co-Cr alloy as bio-material.
  American Journal of Applied Sciences. 01/2010;
• Article: Mode-I Toughness and Curing Pressure Characteristic of Symmetrical Lay-Up of Plain-Weave Woven GFRP Composites

  Yeo Kiam Beng, Mohd Noh Dalimin, Mohd Aidy Faizal
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  ABSTRACT: This study describes an experimental study on the interlaminar Mode-I fracture toughness behavior of hand lay-up plain-weave woven GFRP laminate by using a fracture energy method of evaluation. Mode-I Double Cantilever Beam (DCB) tests were performed on woven GFRP unsaturated polyester composite, E-Glass EWR 600 NISER, specimens. The specimen design and test procedure are performed with reference to the BS ISO 15024 and ASTM D5528. Various curing uniform pressure distribution has been investigated at 35.8, 70.1, 104 and 138.2 kg m<SUP>-2</SUP>, with respect to the toughness value. The lay-up laminates designed with symmetrical arrangement at the center-plane of the composite are also investigated. The experimental results of mode-I fracture toughness as a function of crack length has been obtained. Experimental data obtain are analyzed using the modified beam theory, MBT method. The delamination-resistance curve or the R-curve effect has been found as the general characteristics of the laminate system. Fiber bridging phenomenon with slow and stable crack propagation and extensive half-arm fiber bridged are also observed with lower curing pressure found to produce higher G<SUB>IC</SUB> propagation values.
  Journal of Applied Sciences. 01/2007;