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Home  >  Transactions of NAMP VOL 7

33. PORCELAIN CERAMICS FROM AGRIC-WASTE RICE HUSK ASH (RHA) by aH. U. Jamo, bI. A. Auwalu, cM. A. Y. Hotoro Transaction Volume 7, (March, 2018), pp245 – 250
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PORCELAIN CERAMICS FROM AGRIC-WASTE RICE HUSK ASH (RHA)

aH. U. Jamo, bI. A. Auwalu, cM. A. Y. Hotoro

Department of Physics, Kano University of Science and Technology Wudil, P.M.B. 3244 Kano.

Abstract

In this study, rice husk ash (RHA) was used as a fluxing agent, in a porcelain body, was determined. The RHA was used as a substitute for quartz at different replacement levels (0wt%-25wt%). The mixed powder was pressed into pellets and bars at pressure of 91 MPa. All the pellets were sintered at the temperatures of 1000οC, 1100οC, 1200οC and 1300οC for 2 hours soaking time, at a heating rate of 5οC per minute. The Vickers hardness, bending strength and compressive strength tests are directly related to the increase in temperature and substitution. The microstructural observations show that as the temperature increases to the grain size becomes smaller because of the quartz conversion to cristobalite due to increase in temperature and substitution of quartz by RHA. The compressive strength was the highest at a temperature of 1200οC on 20wt% substitution of RHA. The improvement in the properties could be attributed to sharp changes in the microstructural features as a result of increase in mullite and glassy phase simultaneously. 

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