中文摘要：

涂层裂纹控制和沉积速率的研究是设计和优化电泳沉积涂层的基础.悬浮液特性是影响电泳沉积涂层的关键因素之一.通过对不同pH条件下悬浮液的粒径、zeta电位、电导率和稳定性等参数的测定,探讨悬浮液特性参数对电泳沉积羟基磷灰石涂层过程中涂层裂纹控制和沉积速率的影响.结果表明：沉积速率随悬浮液pH的增加先增加后减小,并在pH 2.9附近获得最大值.此外,沉积速率还受陈化时间的影响.悬浮液pH对涂层裂纹控制有重要影响,在pH 2.9附近电泳沉积获得的涂层的裂纹最少.悬浮液在pH 2.9附近（电导率为11~12μs/cm）且陈化1~2 d是电泳沉积针状羟基磷灰石涂层的适宜条件.

英文摘要：

It is essential to study the crack controlling and deposition rate for the design and optimization of the coatings fabricated by the electrophoretic deposition（EPD） process.The property of the suspension is a key factor in the electrophoretic deposition of coatings.The parameters related to the property of the suspension such as particle size,zeta potential of the particle,conductivity and stability were characterized and then their effects on both the crack controlling and deposition rate in the electrophoretic deposition process of hydroxyapatite（HA） coatings were discussed.Results showed that the deposition rate increases at the first stage as the pH of the suspension increased and then decreased,gaining a maximum at the pH value of about 2.9.In addition,the aging time plays an important role in the deposition rate.Again,the pH of the suspension showed a significant influence on the crack controlling of HA coatings and cracks were minimized in the coating deposited from the suspension with a pH value of about 2.9.The suspension at pH 2.9 approximately with a conductivity of 11 μs/cm to 12 μs/cm and aging for 1 d to 2 d is appropriate for the electrophoretic deposition of needle-like HA coatings.