Mechanical Properties Of Mullite-Bonded Silicon Carbide Sintered At Various Heating Temperature

Lim , Yee Kai (2008) Mechanical Properties Of Mullite-Bonded Silicon Carbide Sintered At Various Heating Temperature. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

Mullite-bonded porous silicon carbide samples are produced by the reaction sintering in air from silicon carbide (SiC), alumina(Al2O3), and using graphite as the pore former. The sintering process is based on the oxidation of Sic and the mullitization between A1203 and oxidation derived Si02 (Cristobalite). At mullitization temperature (1450°c), Sic particles are bonded by the mullite (3A1203.2Si02) and Si02. Sintered samples will be characterized by density determination and three-point bend tests. Morphology and microstructure analysis study will be done by scanning electron microscopy, while the phase composition will be investigated by X-ray diffraction. Mullite phase transformation start at 1450°c which was the optimum sintering temperature for mullite transformation. The mullite content increase with sintering temperature concurrent with decrease of A1203. Porous Sic ceramics were bonded by the mullite (needle like) and oxidationderived Si02. The densities was increase while the open porosity was decreases with increasing of sintering temperature. Flexural strength was direct proportion to the sintering temperature but inverse proportional to the percentage of open porosity. Highest content of mullite and mechanical properties achieved at 1500°c ,

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