The Use of MGO as Sintering Aid for Alumina Ceramics

Siti Noor Elyina, Ab Zarim (2008) The Use of MGO as Sintering Aid for Alumina Ceramics. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The materials that involved in this experiment were Alumina ceramics and Magnesium Oxide (MgO). Alumina ceramics have high melting temperatures, hot and cold mechanical strength and are good for abrasion and corrosion resistant applications. The main objectives of this study are to determine the effectiveness of sintering aid for alumina where alumina is doping with Magnesium Oxide (MgO). Sintering of alumina products usually occurred at temperature above 1˚7C0.0 Because grain growth of alumina is sensitive to sintering temperature, abnormal grain growth in alumina would occur in the final stage of densification if sintering temperature is too high, which has a great influence on flexural strength and wear resistance of pure alumina increase with decreasing grain size. The process that was conducted for this study was powder processing. The sintering aid, MgO which is added in smaller composition (1%) may enhance sintering process. This was because MgO is controlled the aspect ratio of grains and for better densification. The dopant powder is compacted and sintered at three temperature ranges which were 1300˚C, 1350˚C and 1400˚C. After sintering process, the micro-structural, physical and mechanical properties of sintered product were evaluated by using Scanning Electron Microscopy (SEM), Energy Disperse X-Ray (EDX), hardness testing and Archimedes principle. The result was found that the MgO is effective as sintering aid for alumina ceramics.

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