Preparation and Properties of Aluminum Titanate-Cordierite Composite Ceramics
In this study,aluminum titanate-cordierite composite ceramics were successfully prepared by solid-state reaction method,with MgO as a stabilizer and cordierite as a reinforcement.The effects of MgO,cordierite,and sintering temperature on the phase composition,microstructure,sintering performance,and thermodynamic properties of the composite ceramics were systematically investigated.The experimental results show that the introduction of MgO promotes the synthesis and growth of aluminum titanate grains,reduces the sintering temperature,and improves the thermal stability of aluminum titanate ceramics by forming a solid solution of MgxAl2(1-x)Ti(1+x)O5.Cordierite plays an important role in sintering densification and mechanical properties.Under the sintering condition of 1 325 ℃,the sample(MgO content of 8.00％,cordierite content of 15.00％)exhibits excellent performance,with a bulk density of 3.49 g/cm3,a porosity of only 2.2％,a flexural strength of 66.8 MPa,and a thermal expansion coefficient of 2.6×106K-1(room temperature to 1 000 ℃).The research results provide new insights for the design and preparation of high-temperature structural ceramics with excellent comprehensive performance.
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