Laptoiu Stefan Alexandru, Cojocaru Mihai Ovidiu, Miculescu Marian, Branzei Mihai
Department of Metallic Materials Science and Physical Metallurgy, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, Romania.
Section IX-Materials Science and Engineering, Academia of Technical Science Romania, 010413 Bucharest, Romania.
Materials (Basel). 2024 Sep 18;17(18):4583. doi: 10.3390/ma17184583.
The creation of strong adhesive layers of hydroxyapatite-based bioceramics (with or without bioinert metals, such as Ta, Ag, and Ti) on biocompatible metallic supports enhances the local biofunctionalization of surfaces. The processing of electroconductive materials using electrical impulse discharges is versatile, enabling precise coating of selected areas with perfectly adherent layers of varying thicknesses. This study aims to quantify the effects of varying the electrical power from the source generating the impulse discharge and the specific processing time per unit area of the cathode (made of titanium alloy) on the relative mass increase of the cathode. The anode comprised a mixture of hydroxyapatite powder and a self-polymerizing electroconductive acrylic resin in a tantalum sheath. The effects of the parameter adjustments on single-layer deposition adherence were quantified using a central composite design to build a second-order orthogonal model. The most significant difference in relative mass was observed with a low-power source (5 W) ensuring the electrical discharge impulse, combined with the longest specified surface treatment time (17.5 s/cm on a 4 cm surface) for a single layer presenting the largest mass increase of 0.153% of the original mass. This study aimed to enhance the performance of medical implants by optimizing surface biofunctionalization through robust hydroxyapatite-based bioceramic adhesive layers on metallic supports, determining the optimal electrical power and processing time for cathode mass increase during deposition processes, and analyzing parameter adjustments using second-order statistical orthogonal central composite programming, with a focus on single-layer deposition to identify significant differences in relative mass under specific conditions.
在生物相容性金属载体上创建基于羟基磷灰石的生物陶瓷强粘附层（有无生物惰性金属，如钽、银和钛）可增强表面的局部生物功能化。利用电脉冲放电对导电材料进行加工具有通用性，能够用不同厚度的完美粘附层精确涂覆选定区域。本研究旨在量化产生脉冲放电的电源的电功率变化以及阴极（由钛合金制成）每单位面积的特定加工时间对阴极相对质量增加的影响。阳极由羟基磷灰石粉末和自聚合导电丙烯酸树脂在钽护套中的混合物组成。使用中心复合设计来构建二阶正交模型，以量化参数调整对单层沉积附着力的影响。在低功率源（5 W）确保放电脉冲的情况下，观察到相对质量的最显著差异，结合最长的指定表面处理时间（在4 cm表面上为17.5 s/cm），对于单层，质量增加最大，为原始质量的0.153%。本研究旨在通过在金属载体上通过坚固的基于羟基磷灰石的生物陶瓷粘附层优化表面生物功能化、确定沉积过程中阴极质量增加的最佳电功率和加工时间以及使用二阶统计正交中心复合编程分析参数调整来提高医疗植入物的性能，重点是单层沉积以识别特定条件下相对质量的显著差异。
