以雙極脈衝微弧氧化法與水熱法在純鈦基板上披覆高附著性與生物活性之膜層

Deposition of high adhesion and biological activity coating on titanium substrate by bipolar pulse micro-arc oxidation and hydrothermal method

謝昇龍(Sheng-Long Hsieh)

指導教授 ： 楊木榮

大同大學/工程學院/材料工程學系所/碩士(2010年)

摘要

本實驗製程使用雙極脈衝微弧氧化法在純鈦基板上披覆一層包含鈣與磷元素的結晶性陶瓷氧化膜，膜層主要為銳鈦礦與金紅石結構，厚度在3~15μm之間，再利用水熱法在氧化膜的表面合成氫氧基磷灰石的結晶，使膜層具有多孔性、粗糙性、高附著力和生物活性。
實驗結果發現在定電壓的模式下，使用高電壓有機會生成較高附著力的膜層，最高附著力達54Mpa，由膜層的側面來觀察具有較緻密的結構，而附著力低於40Mpa的膜層中普遍存在著很多的空洞與缺陷。
陽極作功時間增加有助於膜厚、粗糙度、孔徑大小及含鈣量、鈣磷比的提升，也可以促進高溫相的形成，而因為鈣磷比的提高也使水熱法後氫氧基磷灰石的披覆程度越好。若在高電壓和高醋酸鈣濃度下進行微弧氧化，提高佔空比會使表面產生許多蝕孔，但這個現象反而使表面的潤濕性更好，隨著佔空比提高可降低水接觸角，在醋酸鈣濃度0.30M、正電壓380V下可達到超親水性效果。水熱法後可以保留原先氧化膜表面的孔洞與粗糙度，且透過水熱法製程可以使表面的潤濕性更好。進行細胞培養五天後，醋酸鈣0.25M正電壓300V佔空比40%下的膜層經過水熱處理後表現出比純鈦還高的細胞存活率。

關鍵字

微弧氧化 ； 水熱法 ； 氫氧基磷灰石 ； 鈦 ； 雙極脈衝 ； 附著性 ； 生物活性

並列摘要

In the experimental process, contains calcium and phosphorus of oxide ceramic coating on titanium substrate produced by pulsed bipolar micro-arc oxidation process. The oxide ceramic consisted of anatase and rutile,and the thickness of the film was 3~15μm.Hydroxyapatite crystallization is forming on surface of the oxide film prepared by hydrothermal, consult of oxide layer are porous, rough, high adhesion and biological activity.
It was found in the constant voltage mode, use high voltage to generate a higher adhesion of the film. The maximum adhesion over 54MPa, observe to side of the film is exactlly compact of structure. And adhesion is lower than 40MPa of film generally there are a lot of cavities and defects.
Increased of thinkness,roughness,diameter of pores , calcium content, and Ca/P of the film by increasing of duty ratio, also can promote the formation of high-temperature phase. Because increased of Ca/P,hydroxyapatite coating film become excellent with hydrothermal. If the high voltage and high concentrations of calcium acetate for oxidation, raising the duty cycle will produce a number of surface pits. This phenomenon is the better of surface wettability, with increasing the duty cycle can reduce the contact angle of water. It was super-hydrophilic within the concentration of the acetic acid is 0.30M and positive voltage is 380V. The porous and the roughness can keep constant on the surface of oxide film, and the better of surface wettability by hydrothermal. After five days of cell culture, the film after hydrothermal treatment showed even higher cell viability than titanium.

並列關鍵字

micro-arc oxidation ； hydrothermal ； hydroxyapatite ； titanium ； bipolar pulse ； adhesion ； biological activity

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