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Home  >  Volume 35

Effects of Temperature and Substitution of Quartz By Rice Husk Ash (RHA) On the Hardness of Porcelain Body by Hassan Usman Jamo (pages 125-130)
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The effect of temperature and substitution of quartz by rice husk ash (RHA) on hardness of porcelain tile was investigated.  Rice husk ash (RHA) was used as a substitute for quartz with different replacement levels (0wt%-25wt%). The mixed powder was pressed into pellets and  at pressure of 91 MPa. All the pellets were sintered at the temperatures of 1000C, 1100C, 1200C and 1300C for 2 hours soaking time, at a heating rate of 5C per minute. Study on the effect of the microstructure of the porcelain on the Vickers hardness and physical properties has been carried out. 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 Vickers hardness and bulk density was the highest and the porosity was the least at a temperature of 1200C on 20wt% substitution of POFA. Porcelain containing POFA has about 7% weight reduction compared with normal porcelain. 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.

Keywords:Bulk density; Vickers hardness; Porcelain; RHA; Temperature