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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。
The current density was changed to form a calcium phosphate precoat on the surface of titanium alloy, which was converted to hydroxyapatite (HA) by lye treatment. Scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis and tensile tests and simulated body fluid experiments show that the low current density precoating is dense CaHPO4-2H2O, the coating is loose with the increase of current density Acicular Ca3 (PO4) 2 - n H2 O, but all of them were changed to hydroxyapatite after alkali treatment. The tensile strength of hydroxyapatite coating decreased with the increase of current density and was weak in simulated body fluid , Dense coating is more stable than the loose coating.