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    Effects of sodium lignosulfonate and silane coupling agent additions on the microstructures and properties of aluminum silicate fiber-based ceramic filter elements for high-temperature filtration

    Year: 2021

    Journal: J. Eur. Ceram. Soc., Volume 41, JAN, page 856–863

    Authors: Miao, Linfeng; Wu, Xiaolin; Ji, Zhongli; Zhao, Zhen

    Organizations: National Key Research and Development Program of China [2016YFB0601100]

    Keywords: Ceramic filter element; Aluminum silicate fiber; Silica sol; Modification; Hot-gas filtration

    Sodium lignosulfonate (SL) and silane coupling agent (SCA) were used to modify the fibrous filter elements to remove the useless binder and improve the strength, and their effects on the microstructures and properties were investigated. SL reduced the slurry viscosity to remove the binder present in the pores. The bulk density of the filter element was decreased after modification by SL, but the flexural strength was hardly affected. SCA enabled more Si-O bonds to be formed to enhance the adhesion between the binder and fibers. After further modification by SCA, the binder content at the crossing points between the fibers and the bonding strength between the binder and fibers were improved so that the flexural strength was significantly increased. Furthermore, owing to the decrease in the surface tension after adding SL, more binder bridges were formed on the upper surface of the filter element, affecting the gas permeability.
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