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Acoustic Emission During Firing of the Illite-Based Ceramics with Fly Ash Addition

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Knapek M., Húlan T., Dobroň P., Chmelík F., Trník A., Štubňa I.

Acta Physica Polonica A

2015

vol. 128

issue 4

783-786

In this work, illite-based ceramic body with power plant fly ash addition (60 wt.% of illite, 30 wt.% of fly ash and 10 wt.% of illite fired at 1100°C) was investigated by the thermal analysis techniques (differential thermal analysis, thermodilatometry and thermogravimetry) and the acoustic emission technique. The green body was heated up to 1100°C at three different rates 2.5, 5, 10 K/min. The most intense acoustic emission was recorded at the highest rate 10 K/min. Mutual correlations between thermal analyses and acoustic emission data were also examined. The first acoustic emission response appears at 430°C, corresponding to a small endotherm on the DTA curve, where the thermal decomposition of mineral portlandite takes place. In the temperature range from 600 to 900°C, high acoustic emission activity correlates with dehydroxylation and expansion of the sample. At temperatures higher than 800°C, the source of acoustic emission signals is the thermal decomposition of calcite. The amorphous phase created from illite at 920°C becomes pyroplastic, therefore it is not documented by the acoustic emission technique.

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1 Acta Physica Polonica A

1 2015

1 Chmelík F.

1 Dobroň P.

1 Húlan T.

1 Knapek M.

1 Trník A.

1 Štubňa I.

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Acoustic Emission During Firing of the Illite-Based Ceramics with Fly Ash Addition