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- Title
Acoustic Emission During Firing of the Illite-Based Ceramics with Fly Ash Addition.
- Authors
KNAPEK, M.; HÚLAN, T.; DOBROŇ, P.; CHMELÍK, F.; TRNÍK, A.; ŠTUBŇA, I.
- Abstract
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.
- Subjects
FLY ash; PHASE transitions; ELECTRICAL resistivity; ELECTRIC properties of materials; THERMOGRAVIMETRY
- Publication
Acta Physica Polonica: A, 2015, Vol 128, Issue 4, p783
- ISSN
0587-4246
- Publication type
Article
- DOI
10.12693/APhysPolA.128.783