Abstract
The effect of small additions of magnesium titanate, calcium titanate, strontium titanate, and barium titanate on the sintering temperature of aluminum oxide was investigated. The dependence of linear shrinkage and density on sintering temperature and dopant concentration and type was studied. X-ray analysis, microscopic examination, and electron microprobe analysis indicate that sintering occurred through a liquid phase and that Ti 4+ diffused into the Al 2O 3 grains. When CaTiO 3, SrTiO 3, and BaTiO 3 were added, the compounds 3CaO · Al 2O 3, SrO · 6Al 2O 3, and BaO · 6Al 2O 2 were formed. The sintering temperature was reduced to 1500°C by adding less than 2 mol% of magnesium, calcium, strontium, or barium titanate.
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