Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Caixa Postal 676, 13560-970 São Carlos, SP, Brazil.
Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Caixa Postal 676, 13560-970 São Carlos, SP, Brazil.
Mater Sci Eng C Mater Biol Appl. 2014 Aug 1;41:343-8. doi: 10.1016/j.msec.2014.04.068. Epub 2014 May 4.
The growth of oxides on the surfaces of pure Ti and two of its ternary alloys, Ti-6Al-4V and Ti-6Al-7Nb, by micro-arc oxidation (MAO) in a pH 5 phosphate buffer was investigated. The primary aim was to form thick, porous, and aluminum-free oxide layers, because these characteristics favor bonding between bone and metal when the latter is implanted in the human body. On Ti, Ti-6Al-4 V, and Ti-6Al-7Nb, the oxides exhibited breakdown potentials of about 200 V, 130 V, and 140 V, respectively, indicating that the oxide formed on the pure metal is the most stable. The use of the MAO procedure led to the formation of highly porous oxides, with a uniform distribution of pores; the pores varied in size, depending on the anodizing applied voltage and time. Irrespective of the material being anodized, Raman analyses allowed us to determine that the oxide films consisted mainly of the anatase phase of TiO2, and XPS results indicated that this oxide is free of Al and any other alloying element.
通过在 pH 值为 5 的磷酸盐缓冲液中进行微弧氧化 (MAO)，研究了纯钛及其两种三元合金 Ti-6Al-4V 和 Ti-6Al-7Nb 表面氧化物的生长情况。主要目的是形成厚而多孔且不含铝的氧化层，因为当金属植入人体时，这些特性有利于骨骼和金属之间的结合。在 Ti、Ti-6Al-4V 和 Ti-6Al-7Nb 上，氧化物的击穿电位分别约为 200V、130V 和 140V，表明在纯金属上形成的氧化物最稳定。MAO 工艺的使用导致形成了高度多孔的氧化物，其孔分布均匀；根据施加的阳极氧化电压和时间，孔的大小不同。无论被阳极氧化的材料如何，拉曼分析都表明氧化物膜主要由 TiO2 的锐钛矿相组成，XPS 结果表明这种氧化物不含 Al 和任何其他合金元素。
