磁控溅射法制备的羟基磷灰石—氧化锆涂层的力学性能(英文)

采用磁控溅射法在Ti6Al4V钛合金基体上制备羟基磷灰石(HA)-氧化锆(ZrO2)复合涂层,通过SEM、EDS、XRD和划痕法对50HA-50ZrO2和75HA-25ZrO2(质量分数,%)涂层进行表征,分析HA含量对涂层残余应力的影响。实验结果表明,HA-ZrO2复合涂层的物相为HA、ZrO2和Y2O3,在复合过程中HA部分发生分解,产生TCP和CaO等杂质相;涂层表面呈多孔状,有利于类骨组织的生长,50HA-50ZrO2和75HA-25ZrO2深层的表面粗糙度分别为1.61μm和2.92μm;涂层结合界面为机械结合方式,划痕法测量的50HA-50ZrO2和75HA-25ZrO2深层界面结合强度分别为30N和17.5N,随着HA含量的增加,涂层结合强度呈现下降的趋势;50HA-50ZrO2和75HA-25ZrO2涂层的残余应力分别为(-399.1±3)MPa和(-343.2±20.3)MPa,适当增加HA可以减小涂层的残余应力。

Mechanical properties of hydroxyapatite-zirconia coatings prepared by magnetron sputtering

Hydroxyapatite (HA)-zirconium (ZrO2) composite coating was produced by magnetic sputtering on Ti6Al4V titanium alloy substrate, the coatings of 50HA-50ZrO2 and 75HA-25ZrO2 (mass fraction, %) were characterized by scanning electron microscopy, energy disperse spectroscopy, X-ray diffraction and scratch test, respectively, and the effects of HA contents in the coating on residual stress were analyzed. The experimental results show that the phases of HA-ZrO2 composite coatings are HA, ZrO2 and Y2O3, and the HA has a certain decomposition in the combination process, producing TCP and CaO impurity phases. The porous surface of coating is conducive to the growth of bone tissue, and the surface roughness values of 50HA-50ZrO2 and 75HA-25ZrO2 are 1.61 μm and 2.92 μm, respectively. The coating interface is of mechanical integration, the bonding strength values of 50HA-50ZrO2 and 75HA-25ZrO2 are 30 N and 17.5 N, respectively, showing a downward trend with the HA contents increasing. The residual stress values in the coating of 50HA-50ZrO2 and 75HA-25ZrO2 are (-399.1±3.0) MPa, (-343.2±20.3) MPa, respectively, as a result, the appropriate increase of HA contents in the coating will reduce its residual stress.