- 學位論文
以微弧氧化於純鈦金屬上披覆磷灰石陶瓷結構的製程參數研究
The Study of the Fabrication Parameters of Micro-arc Oxidation on Hydroxyapatite Coating on Pure Titanium Plate
摘要
本實驗利用微弧氧化法的方式在純鈦的試片上披覆含氫氧基磷灰石、鈣鈦礦與氧化鈦結構的陶瓷氧化層。微弧氧化所使用的電解液為醋酸鈣(Ca(CH3COO)2．H2O)、磷酸二氫鈣Ca(H2PO4)2．H2O、乙二胺四乙酸鈉鹽EDTA–2Na及氫氧化鈉NaOH的混和溶液。探討電解液的鈣磷比、氫氧化鈉濃度和微弧氧化法定電壓模式下，不同電壓與微弧氧化時間對披覆於鈦上之陶瓷氧化層的影響。 實驗結果可知增加電解液中的鈣磷比與氫氧化鈉濃度將有助於陶瓷氧化層中生成氫氧基磷灰石與鈣鈦礦結構。微弧氧化法定電壓模式下，陽極電壓未達到使膜層剝離的電壓時，陶瓷氧化膜厚度與粗糙度隨著電壓上升而增加，而陶瓷氧化層中包含金紅石與銳鈦礦氧化鈦、氫氧基磷灰石及鈣鈦礦之複合結構。氧化層中之氫氧基磷灰石結構的結晶性增加，鈣鈦礦結構結晶性呈現先增加而後下降的現象。剖面SEM中可看出陶瓷氧化層與基材間緊密結合，陶瓷氧化膜層為緻密多孔的結構，Ca、P成分mapping可知氧化膜層分為二層，外層鈣與磷含量較多，內層鈣與磷含量較少。
並列摘要
TiO2-based coatings were prepared on pure titanium by micro-arc oxidation (MAO) in an electrolytic solution containing Ca(CH3COO)2．H2O, Ca(H2PO4)2．H2O, EDTA–2Na and NaOH. SEM/EDS and XRD were adopted to investigate the microstructure, elements distribution and phase composition of the coatings prepared in the above electrolytes. Macro-porous titania-based coatings were formed on the titanium substrates at various voltages, charging times, duty ratios, Ca/P ratios, and concentrations of NaOH. The phase, Ca and P content, morphology, and thicknesss of the coatings were strongly dependent on the applied voltage, Ca/P ratio and concentration of NaOH. In particular, HA- and CaTiO3-containing coatings were produced at higher Ca/P ratio and concentration of NaOH. With increasing applied voltage from 260V to 320V, the thickness, roughness of the coatings and the crystallinity of HA and CaTiO3 increased; the rutile phase was formed in the coatings with anatase phase. EDX analysis shows that Ca and P elements tend to present primarily in the region of the coatings.