Porous nanocrystalline titania films by plasma electrolytic oxidation
Porous nanocrystalline titania films by plasma electrolytic oxidation
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DOI：
10.1016/s0257-8972(02)00036-1
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发表时间：
2002-05
影响因子：
5.4
通讯作者：
Yong Han;S. Hong;K. Xu
中科院分区：
文献类型：
--
作者：
Yong Han;S. Hong;K. Xu
采用脉冲电源，在na2co3电解液中，在200 ~ 350 V电压下对钛合金进行等离子体电解氧化，制备了纳米晶二氧化钛薄膜。采用XRD、EDS和场发射（FE） SEM对膜的物相、组成和微观结构进行了表征。采用维氏压痕、纳米压痕和粘接拉伸试验对薄膜的力学性能进行了评价。薄膜的相、孔径和厚度与外加电压有很大关系，这与以前的报道一致。在350 V下制备的薄膜具有孔洞，孔径为~ 1 μm，孔壁由10 ~ 20 nm的金红石晶组成。膜的硬度为0.9±0.2 GPa，杨氏模量为32±4 GPa，结合强度为37±3 MPa。与传统的粗晶二氧化钛陶瓷相比，该薄膜具有显著的塑性和延展性。
Nanocrystalline titania films were prepared by plasma electrolytic oxidation of a titanium alloy at 200–350 V in a Na2CO3electrolytic solution using a pulsed power supply. XRD, EDS and Field Emission (FE) SEM were employed to characterize the phase, composition, and microstructure of the films. Vickers indentation, nanoindentation and adhesion–tension test were used to evaluate the mechanical properties of the films. The phase, pore size and thickness of the films strongly depend on the applied voltage consistent with the previous reports. The films prepared at 350 V were porous with ∼1 μm pores and the pore walls were composed of 10–20 nm rutile crystallites. The hardness, Young's modulus and bond strength of the film were 0.9±0.2 GPa, 32±4 GPa and 37±3 MPa, respectively. The film exhibited a significant plasticity and ductility compared to the conventional coarse-grained titania ceramics.