Effect of ZrSiO2 and MgO additions on reaction sintering and properties of Al2TiO5-based materials |
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Authors: | H Wohlfromm J S Moya P Pena |
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Affiliation: | (1) Instituto de Cerámica y Vidrio (C.S.I.C.), Arganda del Rey, Madrid, Spain |
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Abstract: | Two sets of Al2TiO5-based composites were prepared by reaction sintering of (a) Al2O3/TiO2/ZrSiO4 and (b)Al2O3/TiO2/ZrSiO4/MgO powder mixtures. The influence of the variation of ZrSiO4 content (0 to 10wt%) and the addition of 2 wt% MgO on the reaction-sintering process, microstructure, mechanical and thermal properties, were evaluated. ZrSiO4 addition shifted the Al2TiO5 formation to higher temperatures, whereas MgO accelerated both Al2TiO5 formation and ZrSiO4 decomposition. The presence of ZrSiO4 and an excess of Al2O3 generated a dispersion of ZrO2 and mullite particles in the grain boundaries and enhanced simultaneously the densification process. After sintering in the temperature range 1350 to 1500 ° C, the obtained composites exhibited significantly higher bending strength than the monophasic aluminium titanate (up to 80 M Pa). Al2TiO5 (80wt%)-mullite-ZrO2 composites which combined good mechanical strength (55MPa), low thermal expansion ( 20–1000C < 1 × 10–6 K–1) and excellent thermal stability were obtained by reaction and sintering of powder mixtures containing both ZrSiO4 and MgO. |
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