鈦合金表面多孔結構製備與微弧氧化改質處理

Preparation of porous structures on Ti-based alloy surfaces and modification by micro-arc oxidation technique

劉彥義(Yen-Yi Liu)

指導教授 ： 洪廷甫

國立屏東科技大學/工學院/車輛工程系所/碩士(2016年)

摘要

本研究分別以兩種燒結法製備多孔鈦結構：(1)以純鈦粉末製備塊材多孔結構；(2)以純鈦珠燒結於Ti-6Al-4V ELI基材上製備表面多孔結構。而在純鈦基材微弧氧化法進行表面改質處理研究方面，分別以工作電壓為300 V、350 V及400 V，工作電流為5 A，氧化時間為150秒、300秒及1小時，針對純鈦基板進行微弧氧化處理，後續分析其被覆層之形貌、化學成份、結晶相、膜層厚度、粗糙度、膜層附著性、潤濕性以及鈣磷吸附能力等膜層性質評估。最後將燒結完成之鈦珠表面多孔結構進行微弧氧化表面處理，以製作多孔鈦暨微弧氧化表面改質試件。
研究結果顯示，純鈦粉末經加壓成形及燒結熱處理製程後，可以製備孔隙率約為9-15%之塊材多孔結構，且彈性模數降低至8.4-7.4 GPa與人體骨骼中之海綿骨1-10 GPa相近。純鈦珠經塗佈及高真空熱處理燒結製程後，在Ti-6Al-4V ELI基材表面上可形成孔隙尺寸約為150-300 μm及孔隙率約35%之表面多孔結構。純鈦試片表面經微弧氧化表面處理後會產生微孔洞形貌。而隨著工作電壓提升與氧化時間增加時，試片表面之氧元素含量、TiO2結晶相峰值、親水性皆有增加趨勢，但膜層附著性則隨著氧化時間增加而降低。將試片浸泡於1.5 m-SBF發現，經微弧氧化處理後可增加純鈦試片表面吸引溶液中鈣與磷之能力，預期增進鈦金屬之生物活性。最後，成功於鈦珠表面多孔結構試件表面進行微弧氧化表面改質，將可望增進試件表面之生物相容性與機械特性。

關鍵字

鈦 ； 多孔結構 ； 微弧氧化 ； 表面處理 ； 氧化鈦

並列摘要

The purpose of this study is to fabricate porous titanium structures by two sintering methods: (1) sintering compressed titanium powders to prepare bulk porous structure; (2) sintering titanium beads on Ti-6Al-4V ELI substrate to fabricate surface porous structure. The MAO process was carried out at 5A current with different applied voltage (300V, 350V, 400V) and oxidation time (150sec, 300sec, 1hour), respectively, on pure Ti surfaces. The surface morphology, chemical composition, crystalline phases, wettability and adhesion of the sample surfaces were characterized via various techniques. Finally, MAO technique was applied to the titanium surface porous structures.
The results show that bulk porous structures were fabricated in the porosity range of 9-15%, and Young’s modulus range of 8.4-7.4 GPa The Young’s modulus of the bulk porous structure was close to that of human spongy bone(1-10 GPa). The surface porous structures were fabricated in porosity around 35% and pore size about 150-300 μm. The experimental results indicate that a porous layer was formed on Ti surfaces after the MAO treatment. With increasing the applied voltage and oxidation time, the increase of oxygen composition, anatase crystallinity and hydrophilicity, but the decrease of film adhesion on pure Ti surfaces. When immersing the sample in the 1.5 m-SBF, it was found that the Ca/P inducibility can be enhanced after MAO process, which indicates a more outstanding biocompatibility. At the end, MAO technique was successfully applied to the titanium surface porous structures, to enhancing their biocompatibility and mechanical properties.

並列關鍵字

Ti ； Porous Structure ； Micro-Arc Oxidation ； Surface Treatment ； Titanium Oxide

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