Abstract
In the Al2O3-TiO2 system, solid solutions of AIO(OH) gel are formed between 5 and 20 mol% TiO2 by the simultaneous hydrolysis of aluminium and titanium alkoxides, followed by washing and drying. After dehydration γ-Al2O3 solid solutions crystallize slowly from amorphous materials. At higher temperatures, rutile (TiO2) is formed directly with the transformation of γ-Al2O3 phases into corundum. Corundum-rutile composite ceramics with dispersed fine pores generated from the decomposition of Al2TiO5 have been fabricated as follows:(1) hot pressing for 2 h at 1350°C under 35 MPa using γ-Al2O3 solid solutions, (2) heating for 1 h at 1500°C to achieve the complete formation of Al2TiO5, and (3) annealing for 7 h at 1000°C to decompose of Al2TiO5 into corundum and rutile. Their mechanical properties have been examined. The bending strength yields the maximum value of 365 MPa with 15 mol% TiO2 content whereas the fracture toughness increases from 4.7 to 6.2 MPam1/2 with increasing TiO2 content.
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