Densification behavior of mullite-Al2TiO5 composites by reaction sintering of natural andalusite and TiO2 |
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| Authors: | Liusheng Li Qingfeng Wang Guihua Liao Kunpeng Li Guotian Ye |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Henan Provincial Key Laboratory of Special Protective Materials, School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China;3. Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China |
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| Abstract: | In this work, mullite-Al2TiO5 composites were fabricated by natural andalusite with TiO2 as an additive. The densification characteristic, phase composition and mullitization process of andalusite with TiO2 addition was investigated by the Archimedes’ principle, dilatometry, X-ray diffraction and scanning electron microscopy (SEM-EDS) techniques. The results showed that the incorporation of TiO2 not only enhanced the thermal stability of in-situ Al2TiO5 in the silica liquid yielded from the mullitization of andalusite, but also accelerated andalusite decomposition and retarded mullite formation, which facilitated the sintering and densification of mullite-Al2TiO5 composites. |
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| Keywords: | Andalusite Mullite Densification Sintering |
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