• Formation and densification of mullite through solid-oxide reaction technique using commercial-grade raw materials

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    • Keywords


      Mullite; raw materials; MgO additive; phase analysis; densification; microstructure.

    • Abstract


      Two different commercially available sources of alumina and silica were used to study the formation and densificationbehaviour of mullite prepared by solid-oxide reaction technique in a single firing. Phase analysis and densificationstudies were carried out on the samples sintered between 1200 and 1600$^{\circ}$C. Effect of addition of 1–6 wt% MgO on thesintered mullite ceramics was also studied.MgO was found to improve the density values for all the compositions till 4 wt%and with higher addition it deteriorated, mainly due to higher extent of liquid phase formation. Mullite formation was foundto start below 1200$^{\circ}$C and constituent oxides were found even at 1600$^{\circ}$C; however, addition of 4 wt% MgO was found to complete the mullite formation at 1600$^{\circ}$C for all the compositions. Microstructural studies showed grain growth in the compositions containing MgO and higher impurities due to formation of greater extent of liquid phase.

    • Author Affiliations



      1. Department of Ceramic Engineering, National Institute of Technology, Rourkela 769008, India
    • Dates

  • Bulletin of Materials Science | News

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