Download 12th INTERNATIONAL CERAMICS CONGRESS PART I Proceedings of by Edited by Pietro VINCENZINI World Academy of Ceramics and PDF

By Edited by Pietro VINCENZINI World Academy of Ceramics and National Research Council, Italy Co-edited by James P. BENNETT NETL – USDOE, USA

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Additional resources for 12th INTERNATIONAL CERAMICS CONGRESS PART I Proceedings of the 12 th International Ceramics Congress, part of CIMTEC 2010- 12 th International Ceramics Congress and 5th Forum on New Materials Montecatini Terme, Italy, June 6-11, 2010 PART I including: Sym

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5. Conclusion Results considered in the present paper have shown the complexity of the high temperature mechanical behavior of monolithic refractory castables. Such a complexity comes from the high heterogeneity of non-reinforced and of reinforced materials. From a mechanical point of view, the complexity deals with the non-linearity of the behavior in a wide temperature range. Origins of this 46 12th INTERNATIONAL CERAMICS CONGRESS PART I non-linearity depend on the temperature since microscopic mechanisms that are involved change between low and high temperature levels.

For geometrically similar specimens brittleness increases with rising B. Flexibility and brittleness. From above considerations it becomes evident that flexibility is no unambiguously defined term. For refractories increase of Rst and R’’’’ often are competing goals. Ranking a set of materials according to these figures will yield different results. The choice of a suitable figure of merit may especially depend on the probability of crack initiation. If it is very likely that crack initiation cannot be avoided then one of the quantities R’’’’, lch or B may be chosen.

Both methods showed good agreement, results of the latter one are included in Table 1. For measurement at 1100°C RFDA has been applied. For determination of material brittleness as well as to provide suitable fractured specimens fracture tests have been performed. A wedge splitting test procedure was applied. K. Tschegg [4,5] who by this method and his visionary physical way of thinking added fundamental and fruitful contributions to fracture mechanics of refractories and other brittle disordered materials.

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