Structure and properties characterization of ceramic coatings produced on Ti–6Al–4V alloy by microarc oxidation in aluminate solution
Structure and properties characterization of ceramic coatings produced on Ti–6Al–4V alloy by microarc oxidation in aluminate solution
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DOI：
10.1016/s0167-577x(01)00440-2
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发表时间：
2002-02
影响因子：
3
通讯作者：
W. Xue;Chao Wang;Ruyi Chen;Z. Deng
中科院分区：
文献类型：
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作者：
W. Xue;Chao Wang;Ruyi Chen;Z. Deng
采用X射线衍射仪(X射线衍射仪)和扫描电子显微镜(SEM)研究了在铝酸盐溶液中交流微弧氧化在Ti-6Al-4V合金表面形成的陶瓷层的组织和相组成。用纳米压痕方法测定了纳米硬度H和弹性模数E沿涂层厚度的分布。微弧氧化处理后，涂层/金属界面附近的Ti-6Al-4V基材的显微组织没有发生变化，同时钛基材几乎没有吸附氧原子。氧化物涂层主要由金红石和TiAl2O5化合物组成。内层涂层的金红石含量远高于外层。相反，TiAl2O5相在外层具有较高的比例。另一方面，纳米压痕测试表明，从涂层表面到涂层内部，H和E逐渐增加。涂层中的最大H和E分别可达13和230 GPa.TiO_2和TiAl_2O_5含量沿涂层厚度的变化决定了涂层中的H和E分布。
Microstructure and phase composition of the ceramic coatings formed on Ti–6Al–4V alloy by alternating-current microarc oxidation in aluminate solution were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Distributions of nanohardness, H, and elastic modulus, E, along the coating thickness were determined using a nanoindentation method. After microarc oxidation treatment, the microstructure in the Ti–6Al–4V substrate near the coating/metal interface has not been changed; meanwhile, the titanium substrate has hardly absorbed oxygen atoms. The oxide coating is mainly composed of TiO2rutile and TiAl2O5compounds. The rutile fraction in the inner layer coating is much higher than in the outer layer. On the contrary, the TiAl2O5phase has a higher fraction in the outer layer. On the other hand, the nanoindentation test shows from the coating surface to the interior of the coating that the H and E gradually increase. The maximum H and E in the coating can reach 13 and 230 GPa, respectively. The changes of TiO2and TiAl2O5contents along the coating thickness determine the H and E profiles in the coating.