At point B, the mass fraction of Al2O3 was 75% mullite solid solution of TiO2 content is 6%; the point C, the mass fraction of Al2O3 was 69.5%, the solid solution content of TiO2 is 3.5% since the system. With the presence of the solid solution of mullite, the system can be divided into the following composition triangles: (1) Al2O3-B-AT forms a triangle. Melting temperature 1727e (P1). The compositional point within this triangle is composed of corundum, AT, and a mullite solid solution of composition B.
(2) AT-C-SiO2 forms a triangle. The melting temperature is 1480e (P2). The compositional point within this triangle is that the crystal phase is AT, SiO2 variant, and mullite solid solution with composition C.
(3) Three composition triangles of Al2O3-AB, AT-BC, and SiO2-CD. The composition of the mixture within these triangles, the initial melting temperature point (ie, the complete freezing point) is on the liquid phase boundary line E3P1, P1P2, E2P2, respectively, the final phase composition is respectively mullite solid solution A, B and corundum, mullite Solid solution B, C and AT, mixture of mullite solid solution C, D and SiO2 variants.
TiO2-SiO2-Al2O3 phase diagram of Al2O3 in an amount equal to or lower than mullite, since the mass fraction of TiO2 is generally thereby be seen: the presence of TiO2 and no significant effect on clay products; while alumina products, Especially for aluminum products with high Al content, the level of TiO2 has a significant effect on its properties. An increase in TiO2 content will reduce the load softening temperature and creep at high temperatures.
It is noteworthy that the aluminum titanate formation reaction is accompanied by a volume expansion of about 10%, and due to the obvious anisotropy of the aluminum titanate crystals, the thermal expansion coefficient varies greatly between the axial directions, and thus the formed titanic acid Aluminum is in a microcracked state, and the self-bonding ability also deteriorates.
TiO2 to corundum and mullite solid solution reported in the literature, in an oxidizing atmosphere, Al2O3 TiO2 Not significantly solid solubility; but in a reducing atmosphere (e.g. hydrogen) and, Ti4 + can be reduced to the Ti3 +, so that a solid solution In corundum, Al2O3 and TiO2 can form Al2O3-TiO2 solid solution under partial reduction atmosphere. In addition, since Ti3+ has an ionic radius of 0.9 and Al3+ has an ionic radius of 0.50, solidification of Ti3+ in the corundum deforms and expands the corundum lattice.
The amount of solid solution of TiO2 in corundum or mullite and its relationship with temperature and other factors have also been reported. The research of Zhu Jinlou et al. showed that the solubility of TiO2 in corundum (mass fraction, the same below) can reach 1% at 1600e, and 4% in mullite.
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