In the present work, hydroxyapatite (HA)‐titanium (Ti, 20 wt%) composite coating was coated on NiTi alloy substrate by EPD (electrophoretic deposition) process. Before applying the coating, the HA powder was composed with Ti powder using a ball milling process. Influence of the ball milling time on morphology and phase structure of HA‐Ti powder was evaluated using TEM and XRD analysis. After composing the HA particles with Ti, the HA‐Ti composite powders were coated on the NiTi substrate by the EPD process in an n‐butanol medium for 2 min, with the applied voltage of 60 V. XRD and SEM analysis were utilized to evaluate the phase analysis and morphology of the coatings. Mechanical and electrochemical characteristic of the coatings were also assessed using the micro‐indentation, micro‐scratch, and polarization tests, respectively. The results revealed that the milling process time had a significant influence on reaction bonds and optimum mixing time was 4 hr. Micro‐hardness of the HA‐Ti composite coating (304 HV) was substantially higher than the HA coating (72 HV). Also, as the HA coating was composed with Ti particles, the amount of force (in the micro‐scratch test) required for detaching the coating from the NiTi substrate increased from 7.1 to 17.8 N. The polarization results showed that the HA‐Ti composite coating had a higher electrochemical resistance compared with the HA coating. Corrosion resistance of the NiTi alloy coated with HA increased from 133 kΩ.cm² to 2,720 kΩ.cm² after composed with the Ti particles.

中文翻译：

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使用电泳沉积和反应键合工艺制造的羟基磷灰石-钛复合涂层的结构表征、机械和电化学研究。

在目前的工作中，羟基磷灰石 (HA)-钛 (Ti, 20 wt%) 复合涂层通过 EPD（电泳沉积）工艺涂覆在 NiTi 合金基材上。在应用涂层之前，HA 粉末是通过球磨工艺与 Ti 粉末组成的。使用 TEM 和 XRD 分析评估球磨时间对 HA-Ti 粉末形貌和相结构的影响。构成与钛的HA颗粒后，HA-Ti系复合粉末在涂覆镍钛基板上通过EPD过程Ñ丁醇介质 2 分钟，外加电压为 60 V。利用 XRD 和 SEM 分析来评估涂层的相分析和形貌。还分别使用微压痕、微划痕和极化测试评估了涂层的机械和电化学特性。结果表明，研磨过程时间对反应键有显着影响，最佳混合时间为 4 小时。HA-Ti 复合涂层 (304 HV) 的显微硬度显着高于 HA 涂层 (72 HV)。此外，由于 HA 涂层由 Ti 颗粒组成，将涂层从 NiTi 基材上分离所需的力（在微划痕测试中）从 7.1 N 增加到 17.8 N。极化结果表明，与HA涂层相比，HA-Ti复合涂层具有更高的电化学电阻。涂有HA的NiTi合金的耐腐蚀性从133 kΩ.cm增加²至 2,720 kΩ.cm ²后与 Ti 颗粒组成。