Studies on the combined effects of titania andsilicon carbide on the phase developments andproperties of carbon-clay based ceramiccomposite

Aramide, Fatai Olufemi and Adepoju, O. D. and Adediran, A.A and Popoola, Abimbola Patricia (2019) Studies on the combined effects of titania andsilicon carbide on the phase developments andproperties of carbon-clay based ceramiccomposite. Cogent Engineering, 6. pp. 1-13. ISSN 1584938

Text Studies on the combined effects of titania and silicon carbide on the phase developments and properties of carbon clay based ceramic composite.pdf - Published Version Download (958kB)

Abstract

Effects of titania (TiO2) and silicon carbide (SiC) on phase developmentand physico-mechanical properties of mullite-carbon were investigated. Powderedclay, kaolinite and graphite of predetermined compositions were blended withadditives using ball mill for 3 h at 60 rev/min. Samples were produced by uniaxialcompression and sintered between 1400°C and 1600°C for 1 h. They were charac-terized for various properties, phases developed and microstructural features. Theaddition of TiO2and SiC in the sample lead to the formation of TiC in the sample at1400°C and 1600°C. This takes place through high-temperature solid-state reaction(reaction sintering) of TiO2and SiC. This also contributes to the reduction in theapparent porosity of the sample with increased sintering temperature. The presenceof titania in the sample does not favour the stability of anorthite beyond 1400°C.The formation of 50.6% mullite in the sample at 1500°C made it have the highest cold crushing strength and absorbed energy. Young’s modulus of the sampleincreased with increased sintering temperature. The sample sintered at 1500°C isconsidered optimum.

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