Abstract

URIBE, Rafael. Medida de propiedades mecánicas y térmicas en PseudoBrukitas del tipo Al₂Tio₅. parte ii: determinación de la conductividad térmica por el método del “Pulso Láser”. Rev. LatinAm. Met. Mat. [online]. 2004, vol.24, n.1-2, pp.41-49. ISSN 0255-6952.

In oxides of Pseudobrookite type such as MgTiO₅, FeTiO₅ and Al₂TiO₅, some properties as elastic modulus, coefficient of thermal expansion and thermal conductivity depend mainly on the material grain size. It has not been found in the literature E, a and k values of Al₂TiO₅ materials completely free of microcracks. The purpose of this paper is to determine the Thermal Conductivity of Al₂TiO₅ particles from the structural material study of Al₂O₃ - Al₂TiO₅ with controlled microstructure. Two compound materials have been characterized Al₂O₃ - Al₂TiO₅ (5 and 10% Al₂TiO₅) and Al₂O₃ as a reference material with similar microstructural characteristics: Approximately 98.6% theoretical density, particle homogeneous dispersion and controlled grain size Al₂O₃ (Æ < 4 mm) and Al₂TiO₅ (Æ < 2.2 mm). Among the several techniques available for measure was the thermal conductivity/diffusivity, the laser flash method stands out for its low run time (less than 1 hour per temperature) and the reduced sample size required. From experimental diffusivity obtained and the application of theoretical models, conductivity value of Al₂TiO₅ particles inferior to 2.2 mm has been estimated with good accuracy. This result is consistent with k values from other pseudobrookite oxides free from microcracks.

Keywords : Thermal conductivity; Thermal diffusivity; Laser flash method,; Aluminum titanate,; Pseudobrookite.