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Porous mullite hollow fiber membranes were prepared with a combined phase-inversion and sintering method, using three sintering additives including yttrium stabilized zirconia (YSZ), small mullite particles (SMP), and titanium oxide (TiO2) to promote the particle sintering. The results indicated that all the three additives could improve the sintering performance of mullite hollow fiber membranes due to the decrease in activation energy of mullite grains. Both YSZ and TiO2 could react with mullite grains to generate composite oxides (e.g., ZrSiO4 and Al2TiO5) during sintering, following a reaction-sintering mechanism. Interestingly, the newly generated ZrSiO4 was instable and further decomposed into monoclinic ZrO2 and SiO2 in the sintering process. The decomposition could avoid excessive embedment of composite oxides among mullite grains which have negative impact on mechanical strength of mullite hollow fibers. Overall, the doping of YSZ provided a better promotion effect on the sintering of mullite hollow fiber membranes, where the microstructural and mechanical properties are insensitive to the doping content and sintering temperatures, so it could be used as the candidate for the large-scale preparation of mullite hollow fibers.


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Preparation of hollow fiber membranes from mullite particles with aid of sintering additives

Show Author's information Hua LIUaJinyun LIUaZhou HONGbShengxian WANGaXuechao GAOa( )Xuehong GUa( )
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu Road (S), Nanjing 211816, China
Nanjing Membrane Materials Industrial Technology Research Institute Co., Ltd., No. 1 Yuansi Road, Pukou Economic Development Zone, Nanjing 211808, China

Abstract

Porous mullite hollow fiber membranes were prepared with a combined phase-inversion and sintering method, using three sintering additives including yttrium stabilized zirconia (YSZ), small mullite particles (SMP), and titanium oxide (TiO2) to promote the particle sintering. The results indicated that all the three additives could improve the sintering performance of mullite hollow fiber membranes due to the decrease in activation energy of mullite grains. Both YSZ and TiO2 could react with mullite grains to generate composite oxides (e.g., ZrSiO4 and Al2TiO5) during sintering, following a reaction-sintering mechanism. Interestingly, the newly generated ZrSiO4 was instable and further decomposed into monoclinic ZrO2 and SiO2 in the sintering process. The decomposition could avoid excessive embedment of composite oxides among mullite grains which have negative impact on mechanical strength of mullite hollow fibers. Overall, the doping of YSZ provided a better promotion effect on the sintering of mullite hollow fiber membranes, where the microstructural and mechanical properties are insensitive to the doping content and sintering temperatures, so it could be used as the candidate for the large-scale preparation of mullite hollow fibers.

Keywords:

mullite, sintering additives, hollow fiber, membranes, sintering behavior
Received: 16 May 2020 Revised: 25 August 2020 Accepted: 04 September 2020 Published: 21 October 2020 Issue date: February 2021
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Publication history
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Acknowledgements
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Publication history

Received: 16 May 2020
Revised: 25 August 2020
Accepted: 04 September 2020
Published: 21 October 2020
Issue date: February 2021

Copyright

© The Author(s) 2020

Acknowledgements

This study was funded by the National Natural Science Foundation of China (22035002, 21776128, 21878147, and 21808106), National Key Research and Development Project (2018YFE0118200), the Leading Talent in Ten-Thousand Talent Program (2019), "333 Talent Project" of Jiangsu Province, the Young Fund of Jiangsu Province (BK20170132), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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