Abstract
MgO–CaO–Al 2O 3–SiO 2 (MCAS) glass synthesized by sol–gel method was used to improve the sintering and dielectric properties of the 0.88Al 2O 3–0.12TiO 2 ceramics. Using MCAS glass as sintering additives, 0.88Al 2O 3–0.12TiO 2 ceramics can be sintered at a relatively low temperature, 1350 °C. The effect of glass additives and post-annealing treatment on the phase compositions and dielectric properties of 0.88Al 2O 3–0.12TiO 2 ceramics is investigated. The decomposition of Al 2TiO 5, which formed in the sintering process, depends on the MCAS content and time of annealing treatment. Further investigation indicates that the decomposition degree of Al 2TiO 5 has a strong influence on the microwave dielectric properties of 0.88Al 2O 3–0.12TiO 2 ceramics.
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