Effects of TiO2 on the Microstructure of Synthesized Elongated Mullite
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Elongated mullite was synthesized via an in situ solid-phase reaction using α-Al2O3 and SiO2 as the raw materials and TiO2 as an additive, and characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). On the basis of thermodynamic analysis of the reaction process, the effects of TiO2 content and reaction temperature on the phase composition, phase contents, and microstructure of the synthesized samples were investigated. The results showed that elongated mullite with a length of about 8.0 μm was formed for the sample with 7 mass-% TiO2 at 1873 K. The dosage of TiO2 exceeded its solid solubility limit in mullite which resulted in the anisotropic growth of mullite grains.
Keywordselongated mullite solid-phase reaction TiO2 anisotropic growth
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51672194 and 51472184), Program for Innovative Teams of Outstanding Young and Middle-aged Researchers in the Higher Education Institutions of Hubei Province (T201602), Key Program of Natural Science Foundation of Hubei Province, China (Contract No. 2017CFA004), Natural Science Foundation of Anhui Provincial Education Department (No. KJ2018A0052), the Opening Project of the Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (No. JKF 18-04), the Open Foundation of the State Key Laboratory of Refractories and Metallurgy (No. G201801), and the Student Research Training Program (SRTP) (201710360184) of Anhui University of Technology.
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