Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 5, Pages 6413-6417Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.11.119
Keywords
Vermiculite; Modification; Thermal expansion; Mechanism
Categories
Funding
- National Natural Science Foundation of China [51974095]
- Natural Science Foundation of Guangxi Province [2018GXNSFAA138166]
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The thermal insulating performance of expanded vermiculite is closely related to expansibility. A novel method of Mg2+ modification was proposed to improve the vermiculite expansion ratio. The modification process was characterised by energy dispersive X-Ray spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric-differential scanning calorimeter and scanning electron microscopy. Moreover, the thermal expansion experiment was performed to investigate the expansion behaviours of Raw-V and Mg-V samples at various temperatures. The result indicated that the introduction of Mg2+ could increase the vermiculite interlayer water content through hydration interaction, and the expansion ratio increased 13.7% under the heating temperature of 900 degrees C after modification. To explain the interaction of magnesium ion and water molecules, a molecular dynamics model was developed, and the simulation results were validated using the binding energy calculation. The results of this study can provide a new perspective and theoretical guidance for the commercial process of vermiculite expansion.
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