Ti-Al-V-O纳米管阵列的制备与热稳定性研究

在醇基介质中采用阳极氧化方法成功在Ti6Al4V合金表面制备出大面积的α和β相均为纳米管结构阵列。通过扫描电子显微镜(SEM)和X射线能谱仪(EDXA)对纳米管阵列的表面形貌、微结构和热稳定性进行了表征。实验结果表明:在醇基溶液中采用阳极氧化方法制备大面积纳米管阵列时,外加电压的增加有利于合金表面多孔纳米结构的形成。在外加电压为30V时,Ti6Al4V合金表面的双相区均获得较为均匀的纳米管阵列。Ti-Al-V-O纳米管阵列管长约900nm、管径约90nm、壁厚约7.4nm。EDXA结果表明:在阳极氧化后,表面Al和V含量降低。Ti-Al-V-O纳米管阵列在550℃下晶化后,其表面形貌可保持规则的纳米阵列结构,而在更高温度下热处理可导致纳米管阵列局部坍塌并发生表面烧结致密化现象。

Fabrication and Thermal Stability Research of Ti-Al-V-ONanotube Arrays

Large area nanotube arrays were successfully fabricated on the surface of Ti6Al4V alloy with the anodization in the alcohol group electrolyte.The surface morphology,microstructure and thermal stability of the nanotube arrays were characterized by the scanning electron microscope and energy dispersive X-ray analysis.The experimental results indicate that the applied voltage has the benefit for the formation of the porous nano structure at the surface of the alloy,when the large area nanotube arrays are fabricated with the anodization method in the alcohol group solution.When the anodization voltage increased to 30 V,regular nanotube arrays were obtained at the α and β phases of the alloy substrate.The length of the nanotube is approximately 900 nm,the diameter is about 90 nm,and the wall thickness is about 7.4 nm.The EDXA result shows that Al and V contents at the alloy surface are reduced after the anodization.Regular nanotube array structure of the surface morphology can be maintained after 550 ℃ heat treatment for crystallization.However,higher temperature heat treatment can lead to partial collapse or surface sintering densification for the nanotube arrays.