Abstract
AbstractThe effects of excess AI2O3 and TiO2 on microstructure, bending strength and thermal expansion of Al2TiO5 ceramics were studied by sintering various compositions of CVD Al2O3-TiO2 powders at 1310°C for 4 h. Excess Al2O3 resulted in much higher bending strength with slightly higher thermal expansion, while excess Ti02 resulted in slightly higher strength with lower thermal expansion. The excess AI2O3 and TiO2 were uniformly dispersed as particles on the Al2TiO5 grain boundaries, creating interlocked grains and dispersed microcracks. Excess TiO2 enhanced the material diffusion while AI2O3 did not, and appeared to develop more anisotropy of Al2TiO5 grains, resulting in lower expansion. It was proved that the overall properties of Al2TiO5 ceramics could be improved by dispersing excess Al2O3 or TiO2 uniformly onto the grain boundaries.
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