Ceramics-Silikáty 52, (2) 115 - 119 (2008) |
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THERMAL SHOCK DAMAGE CHARACTERIZATION OF HIGH TEMPERATURE CERAMICS BY NON DESTRUCTIVE TEST METHODS
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Dimitrijevic Marija 2, Posarac Milica 1, Majstorovic Jelena 3,
Volkov-Husovic Tatjana 2,
Devecerski Aleksandar 1,
Matovic Branko 1
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1 Institute of Nuclear Sciences "Vinca", P.O. Box 522, 11001 Belgrad, Serbia
2 University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, PO Box 3503, 11001 Belgrad, Serbia
3 University of Belgrade, Faculty of Mining and Geology, Djusina 4, Belgrade, Serbia
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Keywords: Ultrasonic velocity, Refractories, Cordierite/SiC composite ceramics, Thermal shock resistance
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In the present work a mixture of commercially available spinel, quartz (SiO₂) and alumina (Al₂O₃) corresponding to a
cordierite stoichiometry was used as starting material for obtaining cordierite/SiC composite ceramics with weight ratio
30:70 and 50:50. Cordierite and silicon carbide are ceramic materials suitable for high temperature application with
superior thermal stability, thermal shock resistance, low thermal expansion coefficient and good chemical resistance.The
composite material could exhibit advantages of its constituents when the components have optimized properties and they are
mixed in the proper ratio. Behavior of composite ceramics after thermal shock treatments was investigated. Thermal shock of
the samples was measured using standard laboratory water quench test. Level of surface deterioration before and during
quenching was monitored by image analysis. Ultrasonic measurements were used as non-destructive quantification of thermal
shock damage in refractory specimens. Dynamic Young modulus of elasticity and strength degradation were calculated
using measured values of ultrasonic velocities obtained by ultrasonic measurements. |
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