HA涂层的电结晶-水热合成及其附着性与结构稳定性探讨

采用电结晶水热合成法在室温条件下从含钙、磷离子的电解水溶液中电结晶沉积磷酸钙涂层，经蒸汽处理和真空煅烧后在钛合金基体上获得羟基磷灰石生物涂层．用ＳＥＭ，ＸＲＤ，ＩＲ分析了涂层的组织、结构和化学组成，分析了羟基磷灰石涂层的形成原理，用粘结拉伸法测量了涂层的结合强度，并在模拟体液中研究了涂层的生物化学稳定性．结果表明：电结晶形成的ＣａＨＰＯ４·２Ｈ２Ｏ涂层经水热处理后，转变为羟基磷灰石．涂层由针状晶体组成，均匀性和粘结性好，纯度高；涂层的结合强度在１５ＭＰａ左右，涂层在模拟体液中浸泡１２个月后化学成分并未发生改变，但质量因降解而减少．

Study of Process and Properties of the Hydroxyapatite Biocoatings Fabricated by Electrocrystallization and Hydrothermal Synthesis

The electrocrystallization hydrothermal synthesis process was used for fabricating hydroxyapatite biocoatings on metallic substrates at low temperatures with aqueous electrolytes containing Ca and P bearing ions. Scanning electron microscopy (SEM) , X ray diffraction (XRD) and infrared spectroscopy (IR) were used to analyze the morphology, structure and chemical composition of the coatings. Bonding strength and biocompatibility of the coatings were measured. The results show that the coatings prepared by this process are wholly composed of needle like hydroxyapatite, and hvae a good uniformity and high purity. The bonding strength is about 15 MPa. Though the mass of the coating decreases as the coating is immersed in the Ringer's solution for 12 months, no changes in the phase composition and morphology were observed.