Influence of the damage level during quenching on thermal shock behavior of low cement castable

Abstract

In the recent decades, the use of unshaped monolithic refractories has been increasing greatly because of their significant advantages over other shaped refractory bricks of the same class. A low cement high alumina castable was synthetised and sintered at 1300°C in order to investigate thermal and mechanical properties, as well as thermal shock behavior. The water quench test was applied as an experimental method for thermal stability testing. Modification of the water quench test was performed by additional monitoring of the samples behavior during the water quench test such as implementation of image analysis and ultrasonic measurements. The image analysis program was applied on samples in order to measure the level of surface damage before and during the water quench test. Ultrasonic measurements were performed with the aim to measure the Young modulus of elasticity during the testing. Strength deterioration of the samples was calculated by the model based on ultrasonic velocity changes during the water quench test. The influence of monitoring the damage level before and during the quench experiment and its influence on thermal shock behavior will be discussed

Investigation the effect of sintering temperature on Young’s modulus evaluation and thermal shock behavior of a cordierite–mullite based composite

“…One of the transducer probes is fixed and the other one is positioned manually at opposite ends of test sample. After traveling through the material, the pulses are received and converted into electrical energy by a second transducer [12,14].…”

“…Since the formation of the cracks has a profound influence on the ultrasonic velocity and the Young's modulus of the material, measuring either of these properties may be applied to monitor the development of the thermal shock damage level [12][13][14]. There were many reports about the practical application of ultrasonic pulse velocity test (UPVT) to characterize and monitor the properties of industrial refractory [4,[15][16][17].…”

Thermal shock properties of glass-ceramics synthesized from a glass frit

“…Knowing the compressive strength of the material before the exposure to the thermal shock testing, and ultrasonic velocity before and after testing, the compressive strength values were calculated from the equation (3) [16,[22][23][24]30]:…”

“…Samples were cylindrically shaped with the same length and diameter (1 cm). Each thermal shock cycle consisted of several consequent steps of rapid cooling into the water [16,[22][23][24][25][26]. At first, the samples were dried at 110 °C for 24 h; then heated in an electrical furnace at 950 °C for 15 minutes.…”

Synthesis and characterization of ceramic composite materials based on silicon-carbide and cordierite

“…Prirodni SiC je prvi put otkriven 1983. godine kao deo meteorita iz kratera Đavoljeg kanjona u Arizoni. Otkrio ga je Ferdinand Henri Moissan po kome je ovaj mineral 1905.godine dobio ime [18].…”