"High temperature mechanical behavior of low stiffness Al2TiO5 and Al2TiO5 - 3Al2O3.2SiO2 - ZrTiO4 composite"

M.A.VIOLINI; M.F. HERNÁNDEZ; S.E. GASS; A.G. TOMBA MARTINEZ; N. RENDTORFF

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2022 vol. 19 p. 514 - 522

1546-542X

The mechanical behavior of low (and negative) thermal expansion Al2TiO5 materials and Al2TiO5-3Al2O3.2SiO2 - ZrTiO4 composite materials was studied by diametral compression test at room temperature, 400 and 800 °C. The effect of both temperature and composition were studied. Stress-strain curves were obtained and, from them, apparent elastic modulus (Eapp) and mechanical strength (σF) were calculated. Fracture mechanisms and fracture patterns were also analyzed. All materials showed a brittle behavior up to 800°C. The thermal variation of σF, that was even higher as testing temperature increased, were interpreted based on the microcracks behavior. A double linear correlation of Eapp was found with temperature (T) and zircon content ([Z]), with a fitting coefficient > 0.9. The particular low stiffness and the mechanical and thermal properties and behaviors of the studied materials suggest that they would be able to withstand thermal stresses.