High temperature characterisation of cordierite-mullite refractory by ultrasonic means
T.Chotard,,J.Soro ,H.Lemercier ,M.Huger ,C.Gault
Impact of thermal shock and related microsturctureal changes on elastic properties of refractories by non-destructive impulse excitation
Thorsten Tonnesen, Rainer Telle RWTH Aachen University, Aachen, Germany
Young’s modulus evolution at high temperature of SiC refractory castable
O.Bahloul T.Chotard M.Huger
Impulse excitation tests to determine the high temperature elastic and damping properties of Si3N4 and other cermics
G. Roebben, O. Van der Biest
The impulse excitation technique (IET) consists of exciting a free vibration in a suspended sample by mechanical impulse loading. The stiffness of the material can be deduced from the resonance frequencies of the sample. The material damping, or internal friction, is related to the exponential decay of the vibration amplitude. Recently IET-systems have been developed which allow to measure both elastic and damping properties up to 1750°C (Roebben et al. (1)). Currently investigations are being made of the phase transformations in zirconia ceramics, crystallisation in glass ceramics and densification during sintering of powder compacts. This paper presents results obtained in the study of crystallisation of intergranular phases in silicon nitride at temperatures above the glass transition temperature of the amorphous grain boundary phases.
Practical use of a non-destructive method for testing refractories
Richter, T.
The accuracy and advantages of the non-destructive resonant frequency technique (impulse excitation technique) for the final inspection of conventional refractory products are discussed. Mathematical models and correlations for alumina brands are presented.
Evaluation of thermal shock damage in castables by a resonant frequency and damping method
horsten Tonnesen, Rainer Telle
The paper is concerned with the characterization of the microstructure and the non-destructive measurement of the elastic an interfacial p
