纳米针状羟基磷灰石涂层的制备及其性能的研究

用电化学沉积法在钛合金上形成涂层，随后在碱性过热蒸气中进行水热处理，最后进行高温真空烧结。用扫描电镜，Ｘ射线衍射和红外光谱对涂层的组织结构和化学成分进行了分析，测量了涂层的粘接拉伸强度，将涂层浸泡于Ｔｙｒｏｄｅ生理盐液中考虑其抗溶解特性。

STUDY ON PREPARATION AND PROPERTIES OF NANO_NEEDLE_LIKE HYDROXYAPATITE COATING

Pre_coatings consisting completely of CaHPO42H2O were fabricated by electro_chemical deposition from aqueous electrolytes containing Ca and P ions. Pre_coating specimens were then treated by hydrothermal process and subsequently sintered in vacuum at different temperatures. The bonding strength of the coatings was measured, and the coatings were immersed in Tyrode's solution for testing. Scanning electron microscopy (SEM), X-ray diffraction (XRD)and infrared spectroscopy(IR) were used to characterize the morphology, structure and chemical composition of the coatings. The results show that after alkaline steam treatment, CaHPO42H2O is transformed into hydroxyapatite(HA),and the content of HA in the coating increases with the steam temperature. Pure HA coating can be synthesized at 150 for 8 h.Many plate_like particles similar to CaHPO42H2O crystals are found in the coatings treated in alkaline steam. These plate_like particles are composed of spherical aggregates formed by nano_needle_like HA cryst