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Effect of rice husk ash additive on porosity, mechanical properties and microstructure of alumina ceramics

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Document pages: 10 pages

Abstract: Porous ceramics are made of a composite material composed of alumina and commercial rice husk ash. The ceramic is prepared by mixing commercial rice husk ash with alumina (Al2O3) powder as a source of silica (SiO2) and pore forming agent. In order to obtain this type of ceramics, the solid-state technology of high-temperature sintering is adopted. The effects of ash ratio of rice husk on mechanical properties, porosity and microstructure were also studied. The results showed that when the ash content of rice husk was increased from 10 to 50   wt , the porosity increased from 42.92 to 49.04 , while the mechanical properties decreased at first, and then increased by   weight percentage and 50   wt at 30 ; Hardness of 20   wt of ash content recorded at 10190 HV1. When the ash content was increased to 30 wt and 50 wt , the hardness was raised to 150.92 HV1 and 158.93 HV1, respectively. The findings also revealed that the tensile and compressive strengths experienced a decrease at 10 wt of the ash content and after that increase at 30 wt and 50 wt of rice husk ash. XRD analysis found multiple phases of ceramic formation after sintering for the different rice husk ash content.

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