電解沉積氫氧基磷灰石/奈米碳管複合鍍層之特性研究

Abstract

本研究的目的是要改進氫氧基磷灰石(HAp)鍍層在鈦金屬表面之附著力與強度。實驗中先於奈米碳管(CNT)懸浮液中電泳沉積一層奈米碳管薄層於鈦片上，隨後再於Ca(NO3)2．H2O 與NH4H2PO4溶液中沉積氫氧基磷灰石的陶瓷鍍層，使其形成HAp/CNT 雙層鍍層，並經由低溫熱處理使鍍層與基材形成更穩定的鍵結。製備好的試片藉由SEM、XRD、FTIR、微硬度試驗、附著力測試、細胞培養等試驗，分析與探討其機械性質與生物活性。 實驗結果顯示，CNT鍍層對於HAp之硬度有顯著的提升，但對於其附著力卻有減弱的效果，且會影響HAp之結晶相變化。另外，分析CNT鍍層之生物相容性之後發現CNT鍍層具有良好的生物相容性。期待在未來能夠找到適合HAp的鍍層處理方式應用於植入物的表面處理。

In this research, Hydroxyapatite/Carbon nanotube composite coating were deposited on titanium alloy by electrolytic method. CNT coating was processed by immersing the titanium alloy plate as electrode in carbon nanotube suspension and then the titanium alloy electrode was placed in a mixing solution of Ca(NO3)2．H2O and NH4H2PO4 to form the HAp layer. After heat-treatment, the samples were characterized by SEM、XRD、FTIR、Micro hardness test、Adhesion test and cell culture were followed. The hardness of the HAp layer was found increased when a CNT layer was added between titanium plate and HAp layer but the adhesion strength of HAp coatings on titanium alloys were decreased when the intermediate CNT coating were existed. In addition, the CNT coating affect the phase transformation after heat-treatment of the HAp. SEM observation of cell culture revealed the better extension of osteoblast-like cell on CNT coated specimens then on those uncoated. The result indicate that coating of CNT intermediate layer promote better biocompatibility.