An assessment of biocompatibility on the surface treatment by wire type EDM method.

我们一直在研究利用电火花加工高效制造生物材料的工艺。利用电火花加工技术，研究了复合零件的表面处理工艺。首先，我们用磷酸三钙和柠檬酸溶液作为电解液，形成了钛LOD。但我们无法获得稳定的放电。然后，我们研究了MCPM(磷酸一水钙蛋白)溶液，以获得在较低电压下的稳定放电，并使用了磷酸三钙和柠檬酸溶液。此外，我们可以使用较高的离子浓度使用MCPM溶液。因此，我们以水为对照，通过离子交换树脂，配以钙离子，制备出不同浓度的MCPM溶液。随着离子浓度的升高，加工速度变慢，表面被认为是钝化的突起。放电时产生的等离子体在电离水中的扩散速度比对照快。XPS分析证实了钙离子注入到钛表面。因此，我们认为这项研究是生物材料和制造工艺方法的有益发展。

We have been researching efficient manufacturing process of biomaterials using EDM(electric discharged machining). We studied the surface treatment of together with forming using EDM. At first, we used TCP(tricalcium phospate) and citric acid solution as electrolyte fluid, to form a titanium lod. But we couldn t obtain stable discharging. Then, we investigated MCPM(monocalciuin phosphate monohydryte) solution to obtain stable discharging at lower voltage then using TCP and citric acid solution. In addition, we could usethe higher ion concentration using MCPM solution. Therefore, we used a water through the ion exchange resin as control, with supplying calcium ion and prepared the MCPM solution with different concentration. A machining speed became lower as the ion concentration became higher and the surface was recognized as dull projections. The diffusion speed of plasma generated at the discharging became faster in ionized water than in the control. The XPS analysis proved calcium ions implanted into the titanium surface. Therefore, we suggested this study was useful development of biomaterials and methods of manufacturing processes.