Titania-based films on selective laser melted Ti13Zr13Nb have been formed by micro-arc oxidation (MAO) at different process parameters (voltage, current, processing time) in order to evaluate the impact of MAO process parameters in calcium and phosphate (Ca + P) containing electrolyte on surface characteristic, early-stage bioactivity, nanomechanical properties, and adhesion between the oxide coatings and substrate. The surface topography, surface roughness, pore diameter, elemental composition, crystal structure, surface wettability, and the early stage-bioactivity in Hank’s solution were evaluated for all coatings. Hardness, maximum indent depth, Young’s modulus, and E_coating/E_substrate, H/E, H³/E² ratios were determined in the case of nanomechanical evaluation while the MAO coating adhesion properties were estimated by the scratch test. The study indicated that the most important parameter of MAO process influencing the coating characteristic is voltage. Due to the good ratio of structural and nanomechanical properties of the coatings, the optimal conditions of MAO process were found at 300 V during 15 min, at 32 mA or 50 mA of current, which resulted in the predictable structure, high Ca/P ratio, high hydrophilicity, the highest demonstrated early-stage bioactivity, better nanomechanical properties, the elastic modulus and hardness well close to the values characteristic for bones, as compared to specimens treated at a lower voltage (200 V) and uncoated substrate, as well as a higher critical load of adhesion and total delamination.

中文翻译：

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微弧氧化工艺参数对选择性激光熔炼Ti13Zr13Nb合金中含磷酸钙的氧化物层特性的影响

通过微弧氧化（MAO）在不同的工艺参数（电压，电流，处理时间）下，在选择性激光熔融Ti13Zr13Nb上形成了基于二氧化钛的膜，以评估MAO工艺参数对钙和磷酸盐（Ca + P）的影响）在表面特性，早期生物活性，纳米机械性能以及氧化物涂层与基材之间的附着力方面包含电解质。对所有涂料评估了汉克溶液的表面形貌，表面粗糙度，孔径，元素组成，晶体结构，表面润湿性和早期生物活性。硬度，最大压痕深度，杨氏模量和E_涂层/ E_基材，H / E，ħ ³ / ë ²在纳米机械评估的情况下，确定比值，而通过划痕试验评估MAO涂层的附着性能。研究表明，影响涂层性能的MAO工艺最重要的参数是电压。由于涂层具有良好的结构和纳米力学性能比，因此在15分钟内300 V，32 mA或50 mA电流下发现了MAO工艺的最佳条件，从而可预测结构，高Ca / P比与在较低电压（200 V）和未经涂层的基材上处理过的样品相比，亲水性高，具有最高的早期生物活性，更好的纳米力学性能，弹性模量和硬度非常接近骨骼的特征值。更高的附着力和总分层临界载荷。