外场作用下NiTi合金表面HAP涂层制备工艺研究

Preparation of HAP Coating on the Surface of NiTi Alloy via External Electrical Treatment

为改善NiTi形状记忆合金的耐蚀性和生物相容性,利用外加交变电场的作用在合金表面沉积羟基磷灰石(HAP)涂层。试验探讨了交变电场的电压、频率和作用时间对NiTi形状记忆合金表面沉积羟基磷灰石涂层的影响。结果表明:随着电场电压、电流频率和作用时间的增加,NiTi合金表面钙磷涂层的厚度逐渐增加,组织变得均匀致密,但若频率过大,时间过长则涂层反而被破坏,最佳电场作用参数为300 V、20 Hz、5 h。涂层呈疏松多孔的羽针状结构,经XRD检测其组织主要为羟基磷灰石;涂层厚度适中,与基体结合强度约为15 MPa,且在模拟体液中具有较好的生物稳定性。

In order to improve corrosion resistance and biocompatibility of NiTi shape memory alloy,the external electrical technology has been used to deposit hydroxyapatite(HAP) coating on the surface of NiTi alloy.The experiment discussed the influence of electric voltage,frequency and working time on the coating.The results showed that: when the voltage,frequency and time were enhanced,the coating became density and homogeneous.But if frequency was too high and the time was too long,the quality of coating became b...