不同过饱和钙化溶液中多孔钛表面磷灰石层的形成

Formation of Apatite on Porous Titanium in Different Supersaturated Calcification Solution

将减液处理过的多孔钛浸泡在含有不同离子及离子浓度的3种过饱和钙化溶液中,均制得了多孔钛表面磷灰石涂层。所有涂层的钙磷比均小于羟基磷灰石的钙磷化学计量比。在SBF和ACS中形成的涂层的钙磷比与人骨中的钙磷比比较接近。在SCS和ACS中形成的涂层还含有磷酸八钙。过饱和度的增加可以引起磷灰石更快成核与生长。较小的过饱和度和Mg^(2+)离子的结晶生长抑制作用使SBF中形成了结晶细小且比较薄的涂层,不破坏多孔钛的孔隙结构。在SCS中形成的涂层厚度约70μm,使孔隙尺寸大大减小。在ACS中形成的涂层有孔隙被堵塞的现象。

Apatite coatings were formed on porous titanium surfaces subjected to NaOH aqueous solution by immersion in various supersaturated calcification solutions. The coatings formed in Simulated Body Fluid (SBF) were island-like apatite, while those formed in Supersaturated Calcium-Phosphate Solution (SCS) and Accelerated Calcification Solution (ACS) were plate-like apatite containing OCP (Octacalcium phosphate); all the coatings were calcium-deficient apatite. Increasing the solution supersaturating degree (S) can induce the earlier and quicker apatite nucleation and growth. Small crystals and thin apatite layer were formed in SBF because of the lower S and Mg2+ ions which can affects the growing rate of apatite crystal by stabilizing amorphous Ca-P phases and the coating did not damage the porous structure of the samples. The thickness of the coatings formed in SCS was about 70 mum and greatly reduced the size of the pores of the porous titanium. The coatings formed in ACS would block up the pores.