Formation and densification of mullite through solid-oxide reaction technique using commercial-grade raw materials
Tóm tắt
Two different commercially available sources of alumina and silica were used to study the formation and densification behaviour of mullite prepared by solid-oxide reaction technique in a single firing. Phase analysis and densification studies were carried out on the samples sintered between 1200 and
$$1600^{{\circ }}\hbox {C}$$
. Effect of addition of 1–6 wt% MgO on the sintered 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 found to start below
$$1200^{{\circ }}\hbox {C}$$
and constituent oxides were found even at
$$1600^{{\circ }}\hbox {C}$$
; however, addition of 4 wt% MgO was found to complete the mullite formation at
$$1600^{{\circ }}\hbox {C}$$
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.
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