| 摘要 |
A plastically deformable aqueous ceramic slurry wherein the ceramic particles have on the surfaces thereof a closely-packed anionic surfactant bilayer or an anionic/nonionic surfactant bilayer.Such slurries are produced by:a) dispersing an amount of ceramic particles in an amount of water to form an aqueous ceramic slurry;b) adding an amount of an anionic surfactant or a mixture of an anionic surfactant and nonionic surfactant to such slurry;c) adjusting the pH value of such slurry to adsorb on the ceramic particle surfaces a closely-packed anionic surfactant bilayer or anionic/nonionic surfactant bilayer.Preferably a mixture of surfactants is used, with a mixture of anionic and nonionic surfactants being highly preferred. Examples of preferred combinations are mixtures of the anionic surfactant SDS and a nonionic surfactant selected from octylphenol polyether alcohols (OPE), in particular C8H15Ph(EO)Rwherein R was 3, 5, 9.5 and 12.5.The dispersed or weakly flocculated ceramic suspensions can then be packed by high density centrifugation or pressure filtration to form consolidated ceramic cakes which are plastic and extrudable allowing them to be shaped into complicated structures by various plastic forming methods. |
