Effects of additives and sintering temperature on phase evolution and properties of carbon-clay ceramic composites
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Effects of additives on phase development and physico-mechanical properties of mullite-carbon was investigated. Powderedclay, kaolinite and graphite of predetermined compositions were blended with additives using ball mill for 3 hrs at 60 rev/min. Samples were produced by uniaxial compression and sintered between 1400 oC and 1600 oC for one hr. They werecharacterized for various properties, developed phases and microstructural features. It was observed that the properties andphase developments in the samples were influenced by the additives. 10 wt % SiC served as nucleating point for SiC around1400 oC. 10 wt % TiO2 lead to development of 2.5 wt % TiC at 1500 oC which increased to 6.8 wt % at 1600 oC. Ifon clay inthe sample leads to development of anorthite and microcline in the samples. 10 wt % TiO2 is effective as anti-oxidant forgraphite up to 1500 oC. Base on strength and absorbed energy, sample C (with 10 wt % TiO2) sintered at 1500 oC is consideredto be optimum.
Abstract
Effects of additives on phase development and physico-mechanical properties of mullite-carbon was investigated. Powderedclay, kaolinite and graphite of predetermined compositions were blended with additives using ball mill for 3 hrs at 60 rev/min. Samples were produced by uniaxial compression and sintered between 1400 oC and 1600 oC for one hr. They werecharacterized for various properties, developed phases and microstructural features. It was observed that the properties andphase developments in the samples were influenced by the additives. 10 wt % SiC served as nucleating point for SiC around1400 oC. 10 wt % TiO2 lead to development of 2.5 wt % TiC at 1500 oC which increased to 6.8 wt % at 1600 oC. Ifon clay inthe sample leads to development of anorthite and microcline in the samples. 10 wt % TiO2 is effective as anti-oxidant forgraphite up to 1500 oC. Base on strength and absorbed energy, sample C (with 10 wt % TiO2) sintered at 1500 oC is consideredto be optimum.
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