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

• Authors: M. Knapek , T. Húlan , P. Dobroň , F. Chmelík , A. Trník , I. Štubňa
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

64.70.ph; 61.43.Fs; 65.60.+a; 81.70.Pg; 43.40.Le

Discipline

• 64.70.ph: Nonmetallic glasses (silicates, oxides, selenides, etc.)
• 61.43.Fs: Glasses
• 65.60.+a: Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.
• 81.70.Pg: Thermal analysis, differential thermal analysis (DTA), differential thermogravimetric analysis

• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 4
• Pages: 783-786

Dates

published

2015-10

Contributors

author

M. Knapek

• Dept. of Physics of Materials, Charles University in Prague, Ke Karlovu 5, 121 16 Prague, Czech Republic

author

T. Húlan

• Dept. of Physics, Constantine the Philosopher University in Nitra, Tr. A. Hlinku 1, 949 74 Nitra, Slovakia

author

P. Dobroň

• Dept. of Physics of Materials, Charles University in Prague, Ke Karlovu 5, 121 16 Prague, Czech Republic

author

F. Chmelík

• Dept. of Physics of Materials, Charles University in Prague, Ke Karlovu 5, 121 16 Prague, Czech Republic

author

A. Trník

• Dept. of Physics, Constantine the Philosopher University in Nitra, Tr. A. Hlinku 1, 949 74 Nitra, Slovakia

author

I. Štubňa

• Dept. of Physics, Constantine the Philosopher University in Nitra, Tr. A. Hlinku 1, 949 74 Nitra, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.128.783