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Ti6Al4V基体经NaOH溶液恒温预处理不同的时间(12、24、36、48、60 h),然后分析了不同的碱预处理时间对Ti6Al4V基体及羟基磷灰石(HA)形态、物相的影响。经碱预处理后Ti6Al4V表面呈现三维网状结构,并检测到了钛酸钠凝胶的存在。随后采用水热电化学方法得到了HA涂层,水热反应电解质包括NaCl、K2HPO4·3H2O、CaCl2,在恒温120℃、电流密度为1.25 mA/cm2的条件下保持120 min。结果表明:HA的生长模式及形态均受预处理时间的影响:当基体经过12 h的预处理后,水热反应形成一层针状HA及少量蒲公英状HA。而蒲公英状HA的数量随预处理时间的增加而增多。但预处理时间大于48 h时,其数量稍有减小。HA在(002)晶面的取向指数、结晶度在预处理时间为48 h时分别达到了最小值、最大值。
The Ti6Al4V matrix was pretreated with sodium hydroxide solution at constant temperature for different time (12,24,36,48,60 h). Then the effects of different pretreatment times on the morphology and phase of Ti6Al4V matrix and hydroxyapatite (HA) were analyzed . After alkali pretreatment Ti6Al4V surface presents three-dimensional network structure, and detected the presence of sodium titanate gel. Subsequently, HA coating was obtained by hydrothermal electrochemical method. The hydrothermal reaction electrolyte including NaCl, K2HPO4 · 3H2O and CaCl2 kept for 120 min under the condition of constant temperature of 120 ℃ and current density of 1.25 mA / cm2. The results showed that the growth mode and morphology of HA were affected by the pretreatment time. After 12 h pretreatment, the HA formed a layer of needle HA and a small amount of dandelion HA. The number of dandelion HA increased with the pretreatment time. However, when the pretreatment time is more than 48 h, its quantity slightly decreases. The orientation index and crystallinity of HA on the (002) plane reach the minimum and maximum, respectively, at the pretreatment time of 48 h.