关键词: 电泳沉积;羟基磷灰石;悬浮液稳定性;Zeta电位

Abstract: The effects of hydroxyapatite particle size , pre-treatment temperature , aging time , dispersion solvent and solid content on the stability of hydroxyapatite suspension were studied .The stability of suspension was characterized by zeta potential and absorbance parameters .And the surface morphologies of coatings were characterized by SEM .The bonding strength between the coating and substrate was tested by shear strength testing experiment .The results show that the smaller the suspension particles , the higher the Zeta potential .Pre-heat treatment at 800 ℃of apatite powders can improve the Zeta potential of suspensions and the bonding strength between the coating and the substrate .The suspension system charges best after aging for 48 h, dense and uniform coating can be obtained .Although stable suspension can be obtained by taking the ethylene glycol as dispersing solvent , ethanol solvent is more conducive to the electrophoretic deposition of the coating .The suspension solid content at 20 g/L can get better quality of coating .

Key words: electrophoretic deposition;hydroxyapatite;suspension stability;Zeta potential