Citrate- and glycerol triesters as novel dual-functional dispersants and plasticisers for ceramic processing

Abstract

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Dispersants for silicon carbide in water—A comparative study

“…Issues, such as additive incompatibility, also must be considered. Examples are competitive adsorption between binder and dispersant resulting in a segregation of binder to the surface 25 or recrystallization of binder and/or plasticizer exsolution due to chemical incompatibilities 26,27 …”

“…Examples are competitive adsorption between binder and dispersant resulting in a segregation of binder to the surface 25 or recrystallization of binder and/or plasticizer exsolution due to chemical incompatibilities. 26,27 Foam creation is also a major concern, in water-based systems, which might have to be mitigated by the addition of defoaming or antifoaming agents. 28 Addition of further chemicals, however, increases the risk of cross-interactions and is thus preferably avoided.…”

“…Tributyl citrate (TBC) and glycerol triacetate (GTA) have both previously been found to enhance the zeta-potential of yttria-stabilized zirconia in ethanol. 27 These were considered interesting due to the inherent large zeta-potential of SiC at alkaline conditions especially when considering the increased dielectric constant of water relative to ethanol. The solubility in water is however rather limited forcing these dispersants to go either to the powder surface or to form a separate liquid phase.…”