Evaluation of the Influence of MgO and La<sub>2</sub>O<sub>3</sub> on
                    the Fast Sintering of Mullite

Souto, Pollyane Márcia de; Menezes, Romualdo Rodrigues; Kiminami, Ruth Herta Goldschmidt Aliaga

doi:10.1590/1516-1439.264814

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Articles • Mat. Res. 18 (1) • Jan-Feb 2015 • https://doi.org/10.1590/1516-1439.264814 copy

Evaluation of the Influence of MgO and La₂O₃ on the Fast Sintering of Mullite

Authorship SCIMAGO INSTITUTIONS RANKINGS

The influence of MgO and La₂O₃ on the fast sintering of mullite was evaluated in this work. High-purity mullite was doped with MgO and La₂O₃, conventionally sintered, fast sintered, and microwave-sintered in rapid sintering cycles. The results showed that MgO and La₂O₃ strongly affected the densification of fast sintered samples; and only doped bodies reached high densities when fast sintered. However, the densification behavior of doped samples was dependent on the amount of sintering aids. MgO doped samples presented better densification behavior than La₂O₃ doped samples. Microwave-processed samples required a balance between power, time and amount of additives to obtain highly dense and homogenous microstructures.

mullite; rapid sintering; sintering additives; MgO; La₂O₃

Sintering Condition		Average Grain Size (μm)
Sintering Condition		Pure	0.5M	1M	2M	0.5L	1L	2L
Conventional	1500 °C/2h	1.6 ± 0.9	3.4 ± 2.2	3.7 ± 2.9	4.0 ± 2.7	2.3 ± 1.5	2.8 ± 1.7	2.4 ± 1.5
	1550 °C/2h	1.6 ± 0.8	3.8 ± 2.2	4.4 ± 2.8	4.7 ± 2.6	2.4 ± 1.5	2.7 ± 1.5	3.1 ± 1.8
	1600 °C/2h	2.7 ± 1.5	4.9 ± 3.0	4.9 ± 3.2	6.3 ± 4.6	3.3 ± 1.7	3.3 ± 1.8	3.5 ± 2.0
Conventional Fast	40 °C/min	2.9 ± 1.4	3.4 ± 1.9	4.1 ± 2.7	5.0 ± 2.6	3.4 ± 1.7	3.2 ± 1.8	3.3 ± 1.8
	60 °C/min	2.7 ± 1.4	3.2 ± 1.6	4.0 ± 2.8	4.3 ± 2.3	3.1 ± 1.6	3.2 ± 1.9	3.5 ± 1.8
	80 °C/min	2.4 ± 1.2	3.2 ± 1.6	3.6 ± 2.1	3.7 ± 2.4	3.3 ± 1.7	3.1 ± 1.8	3.3 ± 1.6
Microwave	1.8kW/30min	1.8 ± 0.8	2.5 ± 1.3	3.0 ± 1.5	4.1 ± 2.3	2.8 ± 1.2	2.2 ± 1.1	2.6 ± 1.3
	1.8kW/40min	2.2 ± 1.2	3.3 ± 1.8	3.7 ± 2.1	4.5 ± 2.8	2.4 ± 1.2	2.6 ± 1.3	2.6 ± 1.3
	2.1kW/20min	2.6 ± 1.2	2.7 ± 1.3	3.2 ± 1.6	3.8 ± 2.1	2.7 ± 1.1	2.5 ± 1.2	2.6 ± 1.1
	2.1kW/40min	2.4 ± 1.2	3.3 ± 2.1	4.2 ± 2.5	5.3 ± 3.2	2.8 ± 1.6	2.8 ± 1.6	3.0 ± 1.7
	2,4kW/30min	2.7 ± 1.4	3.4 ± 1.9	4.3 ± 2.5	4.9 ± 3.0	3.4 ± 1.8	2.9 ± 1.7	3.2 ± 1.8
	2.4kW/40min	2.5 ± 1.0	3.6 ± 2.2	4.1 ± 2.7	4.8 ± 2.9	2.8 ± 1.2	4.9 ± 2.8	5.8 ± 3.3

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Evaluation of the Influence of MgO and La2O3 on the Fast Sintering of Mullite

Evaluation of the Influence of MgO and La₂O₃ on the Fast Sintering of Mullite