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Recent Development and Prospects on Colloidal Bond…
Author:WANGYulong LiXiangcheng CHENPingan ZHUBoquan 
Unit:The State Key Laboratory of Refractories and Metallurgy  Wuhan University of Science and Technology  Wuhan 430081  China 
Keyword:colloidal bonder  refractory castables  application  prospect 
Year,volume(Issue):page number:2017,45(3):422-432

 This review briefly introduces the different binding systems for refractory castables, and represents the benefits of replacing calcium aluminate cement by colloidal binders. The setting mechanisms of colloidal bonded castables were reviewed for effective control of the setting process. The gelling of silica colloids is closely related to the formation of siloxane network. The suspension of silica colloids is commonly destabilized by controlling the pH value, addition of setting agents, drying the suspension and freezing the sol. The suspension of alumina colloids is commonly destabilized by controlling the pH value, changing the ionic strength and temperature. The use of dispersions in colloidal bonded castables was introduced, highlighting the difference of dispersing mechanism in colloidal systems. The surface of silica colloids in slightly alkaline castables system has negative charge, thus selecting the dispersant with a higher pKa value for greater adsorption. The advantages of silica/alumina colloids as a refractory binder were described including a faster drying, a higher sinterability, a superior mechanical strength at intermediate temperatures, better thermomechanical properties at high temperatures. In addition, the future studies on the colloidal bonded refractory castables were also outlined.

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