title: Fabrication of hydroxyapatite ceramics with controlled pore characteristics by slip casting.
abstract: Porous hydroxyapatite (HAp) ceramics with controlled pore characteristics were fabricated using slip casting method by mixing PMMA with HAp powder. The optimum conditions of HAp slip for slip casting was achieved by employing various experimental techniques, zeta potential and sedimentation, as a function of pH of the slips in the pH range of 4-12. HAp suspensions displayed an absolute maximum in zeta potential values and a minimum in sedimentation height at pH 11.5. The optimal amount of dispersant for the HAp suspensions was found at 1.0 wt% according to the viscosity of 25 vol% HAp slurry. The rheological behaviour of HAp slurry displays a shear-thinning behavior without thixotropy, which is needed in slip casting processing. The pore characteristics of sintered porous hydroxyapatite bioceramics can be controlled by added PMMA particle size and volume. The obtained ceramics exhibit higher strength than those obtained by dry pressing.
authors.affiliation: The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050. yaoxmin@yahoo.com
authors.forename: Xiumin
authors.initials: X
authors.lastname: Yao
authors.forename: Shouhong
authors.initials: S
authors.lastname: Tan
authors.forename: Dongliang
authors.initials: D
authors.lastname: Jiang
mesh_terms: D001672:Biocompatible Materials / Q000032:analysis / Q000737:chemistry*; D002516:Ceramics / Q000032:analysis / Q000737:chemistry; D003460:Crystallization / Q000379:methods*; D017886:Durapatite / Q000032:analysis* / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D010316:Particle Size; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D016062:Porosity; D011208:Powders; D013499:Surface Properties; D014783:Viscosity
chemical_list: D001672:Biocompatible Materials; D011208:Powders; D019904:Polymethyl Methacrylate; D017886:Durapatite
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