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Yacob, Dzul Hafez
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document
Effect of double sintering on the properties of porous ceramic
Abstract
This present work reports the fabrication of porous ceramic through thermal treatment ofpowder mixture of alumina and starch. The effects of double sintering on the properties ofporous ceramic were investigated. The mixture was milled and then the dried powder below63 m was sintered in powder form at 1100°C, 1200°C, 1300°C, 1400°C and 1500°C.Meanwhile, the second stage sintering at 1500°C was implemented after powder pressing.All sintering process was carried out for 2 hours. The mechanical and physical propertiessuch as porosity, density, modulus of rupture and hardness have been analyzed. Themodulus of rupture has risen up to 14.704MPa which has successfully improved it about fivetimes higher compared to the strength for single sintered sample. Besides that, the hardnessvalue for double sintered porous ceramic could be increased until 35.90HV. The results haveproven that double sintering process able to improve the density, hardness and strength ofporous ceramic significantly. These ceramic bodies may have a potential use in a wide rangeof applications due to an excellent combination of properties.