电化学沉积法制备和表征锌掺杂羟基磷灰石涂层

摘要

采用电化学沉积法在纯钛金属表面沉积锌掺杂羟基磷灰石涂层并进行表征。SEM及XRD等方法检测发现：溶液中未加入锌时,沉积得到结晶度很高的截面为规则六边形的棒状羟基磷灰石晶体,直径平均约90nm;加入锌后,锌能够抑制羟基磷灰石的结晶过程及形貌转变,同时晶体尺寸明显减小。电解液中掺入的锌含量极值为20mol%,因为当锌含量超过20%时,钛基体表面会沉积无定形的胶状锌钙磷酸盐。XRD精细扫描实验计算得出：当电解液中锌含量低于10mol%时,羟基磷灰石的晶格常数a随锌含量增加而减小,c随锌含量增加而增大;当电解液中锌含量高于10%时,晶格常数a随锌含量增加而增大,c随锌含量增加而减小。%Zn-substituted hydroxyapatite（HAP） coatings on titanium substrates were obtained by electrochemical deposition technique.Scanning electron microscopy was utilized to observe the effect of zinc on the morphology of achieved coatings.The results show that,in the condition of Zn absence in the electrolyte,regular hexagonal and highly crystallized rod-like HAP structure is confirmed,with edge length of about 90nm.However,the presence of Zn in the electrolyte inhibits the morphology transformation of HAP crystals from the initial round rod to the hexagonal rod at the matured stage.X-ray diffractometry（XRD） and Fourier transform infrared（FTIR） spectroscopy reveal that Zn would deteriorate the crystallization of HAP significantly.Zn-substituted HAP crystals are identified when deposited in the electrolytes with Zn less than 25mol%,whereas amorphous Ca（Zn）Ps emerge when Zn reaches to 25mol% in the electrolyte.Slow-scanning X-ray diffraction experiments show that lattice parameter a of HAP descends with addition of Zn when its concentration is below 10mol%,but increases by further Zn addition.The parameter c changes inversely correspondingly.