Well-adhered nanotube arrays were produced through the anodizing technique on a Ti-25Nb-25Ta alloy and tribo-mechanically evaluated by nanoindentation and nanoscratch tests. Disregarding substrate effects, the hardness of the nanotube arrays layer was 0.7 ± 0.1 GPa and elastic modulus was < 12 GPa, respectively. With the load increase and nanotubes compaction, hardness reached 1.8 GPa and elastic modulus stabilized in ∼40 GPa, which features a mechanically biocompatible gradient zone for implant applications. Under scratching, plastic deformations predominated in the nanotube arrays coating, which mechanism was load-dependent: in the first stage (up to 50 mN) and the initial tubes collapsing, the coating presented low cohesive strength; under higher loads and the progressive nanotubes compaction, the cohesive strength increased, as suggested by the pattern of cracks produced. The scratch resistance for the coating failure was higher than 500 mN, consisting of an excellent bonding adhesion for a nanotube layer produced by anodization.

通过阳极氧化技术在Ti-25Nb-25Ta合金上生产出附着力强的纳米管阵列，并通过纳米压痕和纳米划痕试验对其进行了摩擦力学评估。不管基板的影响，纳米管阵列层的硬度分别为0.7±0.1 GPa和弹性模量<12 GPa。随着负载的增加和纳米管的压缩，硬度达到1.8 GPa，弹性模量稳定在约40 GPa，具有机械生物相容性梯度区，适合植入应用。在刮擦下，纳米管阵列涂层中的塑性变形占主导地位，该机理取决于载荷：在第一阶段（最高50 mN）和初始的管子塌陷，涂层表现出较低的内聚强度；在更高的载荷和渐进的纳米管压实下，内聚强度增加，如产生的裂纹图案所暗示的。涂层失效的耐刮擦性高于500 mN，由阳极氧化产生的纳米管层的优异粘合力组成。