Characterization of Al2O3-Al2TiO2 Ceramic Composites: Effects of Sintering Parameters on the Properties

Manuel Fellipe Rodrigues Pais Alves; Caio Marcelo Felbinger Azevedo Cossu; Roberto de Oliveira Magnago; Alfeu Saraiva Ramos; Claudinei dos Santos

doi:10.4028/www.scientific.net/MSF.912.118

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HomeMaterials Science ForumMaterials Science Forum Vol. 912Characterization of Al2O3-Al2TiO2 Ceramic...

Characterization of Al₂O₃-Al₂TiO₂ Ceramic Composites: Effects of Sintering Parameters on the Properties

Abstract:

This study aims to evaluate the effects of sintering parameters in crystalline phases, microstructure and mechanical properties of composites obtained through the Al₂O₃-TiO₂ceramic system. Cylindrical specimens, containing molar ratio of 3 Al₂O₃: 1 TiO₂, were uniaxially pressed at 100 MPa. The applied sintering parameters were varied in five distinct temperature ranges (1300°C, 1400°C, 1500°C, 1575°C or 1600°C) for 2h and 1600°C for 10h. After sintering, samples were characterized by relative density, X-ray diffraction, scanning electron microscopy and mechanical properties (hardness and fracture toughness). After sintering the results point to a microstructure with grains near to 2.5mm, independent of the present phases and crystalline phases composed of: Al₂O₃ rhombohedral, TiO₂ tetragonal e Al₂TiO₅ orthorhombic. The specimens sintered at 1600°C-10h feature densification 30% higher them the ones sintered at 1300°C-2h, reaching a density higher than 85% of theoretical density. The composite presents hardness higher than 1000HV and fracture toughness upper than 2.2MPam^1/2. The better results for the mechanical properties were found in the composites sintered at 1600°C-10h, that showed a bigger relative density than all analyzed specimens, and only phases of Al₂O₃ and Al₂TiO₅ could be found, what means that all TiO₂ was consumed in the sintering of the new composite.

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Materials Science Forum (Volume 912)

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118-123

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.912.118

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Online since:

January 2018

Authors:

Manuel Fellipe Rodrigues Pais Alves*, Caio Marcelo Felbinger Azevedo Cossu, Roberto de Oliveira Magnago, Alfeu Saraiva Ramos, Claudinei dos Santos

Keywords:

Al₂O₃-TiO₂ Composite, Characterization, Phase Compositions, Sintering

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