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Título: | Non-destructive characterisation of alumina/aluminium titanate composites using a micromechanical model and ultrasonic determinations: Part II. Evaluation of microcracking |
Autor: | Hernández, M. G.; Bueno, Salvador CSIC ORCID CVN; Sánchez Martín, Teresa; Anaya Velayos, José Javier CSIC ORCID ; Baudín de la Lastra, Carmen CSIC ORCID | Palabras clave: | Composites Al2O3 Al2TiO5 Ultrasounds Microstructure |
Fecha de publicación: | ene-2008 | Editor: | Elsevier | Citación: | Ceramics International 34(1): 189-195 (2008) | Resumen: | A method for non-destructive detection of microcracks in ceramic composites is described. The method involves the combination of ultrasound characterisation with the application of a three-phase micromechanical model, which considers cracks and pores as void constituents. Four alumina-aluminium titanate materials with different levels of microcracking, from no cracks (monophase alumina) to severely cracked (alumina + 40 vol.% of aluminium titanate) including an alumina + 10 vol.% aluminium titanate material with incipient microcracking have been developed to test the validity of the method. Specimens have been fabricated by colloidal processing and the longitudinal and transverse ultrasound velocities have been determined by the ultrasonic pulse-echo and transmission ultrasound-immersion techniques, employing a digital signal processing. It has been demonstrated that it is possible to differentiate between pores and microcracks, both modelled as void constituents, in terms of the aspect ratio. | Descripción: | 7 pages, 7 figures, 3 tables.-- Available online Nov 7, 2006. | Versión del editor: | http://dx.doi.org/10.1016/j.ceramint.2006.09.007 | URI: | http://hdl.handle.net/10261/13859 | DOI: | 10.1016/j.ceramint.2006.09.007 | ISSN: | 0272-8842 |
Aparece en las colecciones: | (ICV) Artículos (IAI) Artículos |
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