Ceramics-Silikáty 50, (4) 245 - 250 (2006) |
|
FRACTURE BEHAVIOUR OF REFRACTORY CERAMICS AFTER CYCLIC THERMAL SHOCK
|
Chlup Zdeněk 1, Boccaccini Dino N. 2, Leonelli Cristina 2,
Romagnoli Marcello 2,
Boccaccini Aldo R. 3
|
1 Institute of Physics of Materials, Academy of Sciences, Zizkova 22, 616 62, Brno, Czech Republic
2 Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Universita di Modena e Reggio Emilia, 41100 Modena, Italy
3 Department of Materials, Imperial College, London SW7 2BP, United Kingdom
|
Keywords: Cordierite-mullite composite, Refractory materials, Chevron notch, Fracture toughness
|
Two commercially available refractory ceramic materials primary used as substrates for fast firing of porcelain stoneware
were investigated. The first one, commercially known as CONC, contains cordierite and mullite in the ratio 50:50. The REFO
refractory composite material with coarser microstructure compared to CONC has a cordierite-to-mullite ratio of 50:45 and
the balance is filled by quartz. Both materials were exposed to water-quench tests from 1250°C, applying various numbers of
thermal cycles (shocks). Subsequently the fracture toughness was evaluated on both as-received and shocked samples using
the Chevron notched specimen technique. The results were analysed with respect to the microstructure damage caused by the
thermal loading. Scanning electron microscopy was used to analyse both microstructure and fracture surfaces in samples with
different thermal loading history. |
 PDF (1.5 MB) |
|
