Bagasse was obtained after squeezing the sugar cane. In sugar factories, bagasse is burned as fuel for boiler machines. Therefore, there remains lots of bagasse ash every year. Bagasse ash including silica and carbonized bagasse were considered as ceramics material, and mechanical properties of composite using bagasse ash and carbonized bagasse fabricated by spark plasma sintering were investigated. By changing the content ratio between bagasse ash and carbonized bagasse and carbonized bagasse fiber length, the bending strength and flexural modulus were compared with each other. By utilizing the phenomenon that bagasse ash has a melting temperature over 1323K, the sintering temperature of composite was performed at 1423K. The bending strength with content weight ratio of bagasse ash and carbonized bagasse of 1:2 showed the high value of 66MPa. Especially, the composite using carbonized long bagasse fiber showed the highest value for bending strength and flexural modulus. The electrical resistance ratios of composites of 1:2 and 1:3 showed the minimum values and constant trend. Finally, the electrical resistance ratio of composite became about same value as carbonized body only.

Coal ash and aluminum sludge are industrial wastes discharged in large amounts by electric power plants and aluminum sash factories. In this study, aluminum sludge was heat treated at a temperature of 1573K for 2 hours to change the α-alumina crystal structure. The silica (SiO 2) contained in coal ash and the alumina (Al 2 O 3) contained in aluminum sludge were combined to synthesize mullite by using a spark plasma sintering apparatus. While varying the composition ratio of the fly ash and α-alumina sludge, the mechanical properties were investigated. As a result, the bending strength of the composite material (composition weight ratio of coal ash and α-alumina sludge 2:3) showed an extremely high value of 270MPa at a sintering temperature of 1573K and holding pressure of 40MPa. Using X-ray analysis, the existence of mullite crystal structures in this material was confirmed.

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