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- W2045385094 abstract "The microstructure and bending strength of alumina ceramics containing 0-16wt% TiO2 fired from 1400° to 1700°C were investigated. The addition of TiO2 markedly promoted the sintering of alumina at comparatively low temperatures in air. The addition of TiO2 within the solid solubility limit of TiO2 (0.27wt%) also promoted the grain growth of α-Al2O3 at 1600°-1700°C. An excess amount of TiO2 over the solid solubility limit reacted with alumina to form aluminum titanate above 1500°C and dispersed in alumina ceramics. Al2TiO5 as a second phase prevented the grain growth of α-Al2O3, and the grain size of α-Al2O3 decreased with increasing amount of TiO2. The bending strength of specimens fired at lower temperatures increased with increasing amount of TiO2, i. e., with an increase in fired density, In the specimens fired above 1500°C, the bending strength was lowest for 0.2wt% TiO2 addition and increased with further increase in the amount of TiO2, i. e., with a decrease in grain size of α-Al2O3, but the specimens containing a large amount of Al2TiO5 had relatively low bending strengths. In the specimens containing Al2TiO5, some strain appeared in both α-Al2O3 and Al2TiO5 grains due to the difference in their thermal expansion coefficients." @default.
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- W2045385094 date "1987-01-01" @default.
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- W2045385094 title "Microstructures and mechanical properties of TiO2-added alumina ceramics" @default.
- W2045385094 doi "https://doi.org/10.1016/0267-3762(87)90049-x" @default.
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