|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Phase Transformation of Andalusite-Mullite and Its Roles to Microstructure and Sinterability of Refractory Ceramic
||Bowen Li, Mengsheng He, Huaguang Wang
|On-Site Speaker (Planned)
Andalusite is special for the production of refractory ceramics due to its unique property to automatically decompose into mullite and silica during heating at high temperature, which plays a critical role for the effective applications of andulusite. This study investigated the microstructural characteristics and sinterability of andalusite powder during high temperature. The andalusite green body was prepared at 20MPa, then fired at 1150~1450°C. The microstructures and mechanical strengths of the sintered ceramics were studied by compressive test, XRD, and SEM. The results showed that newly born mullite appeared as rod-like microcrystals and dispersed around the initial andalusite. At 1150ºC, the mullitization of andalusite was started, but completed until fired at 1450ºC. The compressive strength of the ceramics increased from 93.7 to 294.6 MPa while increasing the fire temperature from 1150ºC to 1450ºC. Meanwhile, the bulk density of the ceramics was only slightly changed from 2.15 g/cm3 to 2.19 g/cm3.
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