摘要
采用超声微弧氧化技术（UMAO）在医用Ti-3Zr-2Sn-3Mo-25Nb钛合金表面制备生物活性涂层,并研究了磷酸盐电解液浓度和pH值对涂层表面形貌、涂层成分、孔隙率、及涂层厚度的影响。结果表明：涂层主晶相由金红石（Rutile）和锐钛矿（Anatase）结构的TiO_2相组成,涂层较无超声辅助涂层更致密均匀,与基体具有更高的结合强度。电解液中磷酸盐浓度和pH值增大时,阳极表面吸附阴离子磷酸氢根和OH-能力提高,从而易于钙盐胶体微粒发生电泳沉积过程。沉积于表面的钙、磷离子再经超声空化、微射流和微弧高温烧结过程扩散进入涂层内部,有利于提高涂层的生物活性。当磷酸盐浓度为0.18 mol/L,电解液pH值为4.9时,涂层厚度达76μm,孔隙率为22%,结合力为1.3 N,涂层表面分布大量微孔（3~10μm）,为成骨细胞粘附生长提供较好空间。
Bioactive coatings were prepared on Ti-3Zr-2Sn-3Mo-25 Nb titanium alloy surfaces by ultrasonic micro-arc oxidation（ UMAO）technique,and effects of the phosphate concentration and pH value of electrolyte on morphology,compositions,porosity and thickness of the coatings were studied.The results show that the coatings consist of main crystal phases of rutile and anatase TiO_2 with better homogeneity and compactness as well as greater bonding force to substrates compared to that of the without ultrasonic ones.With increasing phosphate concentration and pH values of electrolyte,capability of anionic hydrogen phosphate and OH-adsorbed on the anode surface increases,which favors electrophoretic deposition of calcium salt colloidal particles on anode surface.Calcium and phosphor ions diffuse into internal coatings by ultrasonic cavitation,microjet and micro-arc high-temperature process,improving the biological activity of the coatings.When phosphate concentration and electrolyte pH value are 0.18 mol / L and 4.9,respectively,the thickness,bonding force and porosity of the coatings are 76 μm,1.3 N and 22%,respectively,and a large number of micro-sized holes（ 3-10 μm） are observed on the coating surfaces,which provide space for osteoblast growth.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第10期159-164,171,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(31370979)
黑龙江省自然科学基金重点项目(ZD2016-001)
黑龙江省大学生科技创新项目(102222015771)
佳木斯大学交叉项目(12J201502)
佳木斯大学科技创新团队(Cxtdpy-2016-01)
关键词
超声微弧氧化
生物涂层
溶液浓度
PH值
ultrasonic micro-arc oxidation
bioactive coating
solution concentration
pH values
