Reaction mechanism and microstructure evolution of andalusite with zirconia
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The reaction process of zircon (ZrSiO4) in the andalusite (Al2SiO5)–zirconia system was studied at the temperatures from 1270 to 1460 °C. Phase compositions and microstructures of reaction products were analyzed by X-ray diffraction analysis, scanning electron microscopy and energy-dispersive spectrometer. The results show that andalusite starts to react with ZrO2 to form zircon and mullite at 1270 °C. As the temperature rises, the amount of zircon gradually increases. The reaction process is in accordance with the nuclei and growth models: Amorphous silica formed by the decomposition of andalusite reacts with zirconia to form zircon crystal nucleus, and the nucleus continues to develop and encapsulate the ZrO2. Then, the amorphous silica reacts with zirconia through the product layer of zircon. The time exponent of m illustrates that the reaction between andalusite and zirconia is not an isokinetic process. The reaction rate constant increases with the rise of temperature. The activation energy of the reaction is 127.28 kJ mol−1.
This work was supported by Henan Research Program of Application Foundation and Advanced Technology (No. 122300410244), and the authors would like to express appreciation to High Temperature Ceramics Institute of Zhengzhou University for providing the necessary facilities during the experimentation and tests.
- 2.Bi YB, Xu LH, Hua JL (2006) Effect of some additions on the sintering properties of andalusite products. J Adv Ceram 01:6–8Google Scholar
- 3.Liao GH, Xu GH, Sheng LS (2004) Effect of zircon powder on properties of andalusite based refractories. Nonmet Mines 27:6–8Google Scholar
- 6.Bai ZM, Ma HW (2003) Effect of andalusite on physical properties of quartz–clay–feldspar ternary ceramics. J Chin Ceram Soc 31:393–396Google Scholar
- 7.Li BW, Weng RS (1993) The high temperature feature and mullitization behavior of andalusite from Xixia Henan province. Miner Petrol 13:36–41Google Scholar
- 8.Li LS, Ping ZF (2006) Mullitization of andalusite. Bull Chin Ceram 01:34–36Google Scholar
- 9.Wen HJ, Miao P, Li WC (1995) Mullitization dynamics of andalusite. Refractories 29:141–148Google Scholar
- 12.Jia JY, Zhao SL, Cai JL (2008) Analysis for andalusite on sintering properties in kiln material. China Ceram 44:53–55Google Scholar
- 14.Wu JF, Xu XY, Xu XH, Xu Y, Zhou Y, Zhang YX, Li K (2015) Thermal shock behaviour and EPMA of andalusite-matrix composite ceramics used in solar thermal power generation. J Ceram 36:275–280Google Scholar
- 18.Ding QW, Liu XN, Wang T (2017) Physical and chemistry. Chemical Industry Press, BeijingGoogle Scholar
- 19.Xu ZH, Wang LS (1987) The database of inorganic thermochemistry. Science Press, BeijingGoogle Scholar
- 20.James GS (2005) Lang’s handbook of chemistry. CD & W Inc, WyomingGoogle Scholar