【摘要】 改变电流密度在钛合金表面电结晶出磷酸钙预涂层 ,经碱液处理转变为羟基磷灰石 (hydroxyapatite,HA)。扫描电镜 (SEM) ,X射线衍射 (XRD)分析及拉伸实验与模拟体液实验表明 :小电流密度预涂层为致密片状Ca HPO4 - 2 H2 O,随电流密度增加涂层为疏松、细针状 Ca3(PO4 ) 2 - n H2 O ,但经过碱液处理都转变为羟基磷灰石 ;羟基磷灰石涂层的拉伸强度随电流密度增加而降低 ,在模拟体液中的溶解较弱 ,致密涂层比疏松涂层更为稳定。更多还原

【Abstract】 The calcium phosphate coating(C Ⅰ) on Ti 6Al 4V substrate was electrocrystallized by changing the current density(CD), and was converted to hydroxyapatite coating (C Ⅱ) by alkaline treatment. SEM, XRD, tensile and in vitro tests show that low CD coating(C Ⅰ) is a dense and plate like CaHPO 4 2H 2O (DCPD), and high CD coating(C Ⅰ) is a porous and fine needle like Ca 3(PO 4) 2 nH 2O (COPH), which were converted to hydroxyapatite (HA) by alkaline treatment. The tensile strength of the electrocrystallized HA coatings(C Ⅱ) decreases with increasing CD, and the in vitro solubility of HA coatings (C Ⅱ) is fairly weak. The dense HA coating is more stable, and the porous one is more active in Hank’s balance salt solution (HBSS).更多还原