Effect of Erbium Oxide on Properties of Fly Ash-based Cordierite Ceramics
In this work,cordierite ceramics were prepared by using high-temperature solid-state reaction method,while fly ash,talc,alumina and magnesium oxide were used as raw materials and erbium oxide(Er2O3)was employed as dopant with mass contents of 0,0.5％and 1.0％.The effects of erbium oxide on phase composition,microstructure and physical properties of the cordierite ceramics were studied.Firstly,the doping of Er2O3 promoted the phase formation of cordierite.The optimal doping content is 0.5 wt.％Er2O3.The conversion efficiency of cordierite was increased by forming a liquid phase at low temperatures,thus leading increase in the migration rates of Mg2+and Al3+.Secondly,with 0.5 wt.％Er2O3,after sintering at 1300 ℃,the specimens had single phases,complete crystallization,suitable grain orientation and absence of abnormal grain growth.Lastly,the optimized sample had bulk density of 2.095 g·cm-3,with the apparent porosity and water absorption rate to be 14.86％and 7.09％,respectively.Meanwhile,the compressive strength was 149 MPa,which was 230％higher than that of the undoped specimen.It is confirmed that Er2O3 is a promising sintering aid to significantly improve the comprehensive performance of cordierite ceramics.
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