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Articles by Othman Mamat
Total Records ( 3 ) for Othman Mamat
  Benjamin Iyenagbe Ugheoke , Othman Mamat and B. Ari-Wahjoedi
  It is an established fact that rice husk is rich in amorphous silica which when extracted in sufficiently pure form, could be used in several industrial applications and in the manufacture of value added products. Many of the processes employed for the purification of rice husk silica involve the use of strong acid and bases, requiring complex unit operations and extended times, apart from their unfriendliness to environment and personnel. The hydro thermobaric process was developed as a viable alternative to these rice husk silica purification processes. This study reported a performance comparison in terms of product purity, yield, structure and processing time between the newly developed hydro thermobaric and other previously used processes. The new process surpasses others in terms of processing time and yield while being at par with them in terms of product quality and structure.
  Ahmed N. Oumer and Othman Mamat
  In injection molded fiber reinforced composites, the mechanical and physical properties of the final product are highly dependent on the patterns of fibers alignment. The orientation of the fibers can be influenced by many factors such as molding methods, materials used, geometry of the part and other processing parameters. Thus, there is considerable interest in studying the factors that affect the fiber orientation, hence the properties of the final product. This study presented a general review on the effects of these factors on fiber orientation in injection molded fiber-reinforced polymer composites. The fiber orientation of a part made by conventional injection molding is compared with those produced by injection-compression and push-pull injection techniques. Effects of injection speed, type of flow and mold thickness on fiber orientation are also discussed. Hence, this review could assist in decisions regarding the design of composite products.
  Hudiyo Firmanto , Patthi Hussain and Othman Mamat
  This study investigates diffusion bonding of sialon and high-chromium steel. Sialon and 7.5%-Cr steel were directly joined. The process was performed using hot press machine. Good joint was achieved due to the reaction of the sialon and the steel. The elemental inter-diffusion developed reaction layers in the interface of the bonded materials. The layers consisted of a thin and porous layer adjacent to the sialon and a thicker diffusion zone extended into the steel. Precipitates as reaction products of the sialon and the steel were found in the reaction layer in the sialon side. The reaction layers were more ductile then the bonded materials and helped to attain the joint.
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