电泳沉积用羟基磷灰石稳定悬浮液的制备

研究了羟基磷灰石粉体粒径、粉体预烧温度、陈化时间、分散溶剂、悬浮液固含量对羟基磷灰石悬浮液稳定性的影响,通过测定Zeta电位,吸光度等参数表征悬浮液稳定性,对悬浮液电泳沉积的涂层进行SEM表面形貌及粘结-拉伸结合强度的表征.结果表明:悬浮液颗粒越小,Zeta电位越高;对羟基磷灰石粉体预烧800℃,Zeta电位明显提高,且有利于涂层与基体的结合;悬浮液陈化48 h后,颗粒荷电性最佳,可得致密均匀的涂层;以乙二醇为分散溶剂可制备稳定的悬浮液,但乙醇溶剂更有利于涂层的电泳沉积;悬浮液固含量控制为20g/L时,涂层质量较好.

Preparation of Stabilized Hydroxyapatite Suspension for Electrophoretic Deposition

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 .