【作者】 庞鹏沙； 李卫； 杨中元； 李学锋； 张景怀；

【Author】 Pang Pengsha;Li Wei;Yang Zhongyuan;Li Xuefeng;Zhang Jinghuai;General Research Institute for Nonferrous Metals;GRIPM Advanced Materials Co.,Ltd.;Department of Materials Science and Engineering,Jinan University;

【机构】 北京有色金属研究总院； 有研粉末新材料(北京)有限公司； 暨南大学材料科学与工程系；

【摘要】 钛具有较好的生物相容性和耐蚀性,羟基磷灰石(HA)具有较好的生物活性,结合两者优势的钛基羟基磷灰石表面复合材料具有很好的临床应用前景。首先以甘油磷酸钠和乙酸钙混合溶液作电解液,分别在300 V、350 V、400 V、450 V和500 V条件下做纯钛试样的恒压微弧氧化(MAO);之后在高压反应釜内以去离子水为介质,做以上试样200℃4 h的水热处理。借助于SEM、EDS和XRD分析,研究了钛表面去离子水水热处理后的特殊形貌和晶体结构。结果表明,低压微弧氧化得到的氧化膜层在水热处理后获得的羟基磷灰石颗粒较小和数量较少;高压微弧氧化处理获得的羟基磷灰石颗粒较大和数量较多。但400 V以上氧化的差别较小。HA容易在氧化膜层微孔内和表面凹陷处形核长大。低压微弧氧化处理的,HA容易在表面凹陷处生长;高压微弧氧化处理的,HA在微孔内和表面凹陷处都容易生长。从氧化膜层微孔中生长出来的HA呈棒形颗粒状,受到微孔孔壁的机械限制作用,棒形HA与二氧化钛氧化层的界面结合强度可能更高。氧化膜层内高的钙磷含量有利于水热处理时羟基磷灰石的形成。更多还原

【Abstract】 Owing to the excellent biocompatibility and corrosion-resistant of titanium and bioactivity of hydroxyapatite,the titanium/hydroxyapatite composite material combining their advantages is a highlight with bright prospects in medical clinics.In the present paper,the microarc oxidation（MAO） was performed on commercial pure titanium in an electrolyte containing sodium glycerphosphate（G₃H₇ Na₂O₆ P·5 H₂O,Na-GP） and calcium acetate monohydrate（（CH₃COO）₂ Ca·H₂O,CA） at first.The constant voltages were employed on the process with values of 300 V、350 V、400 V、450 V and 500 V.Furthermore,the hydrothermal treatment was given with media of deionized water at 200℃ for 4 h in an autoclave.The surface morphology of the samples was observed by scanning electron microscopy（SEM） after two steps treatment,and the detailed composition was analyzed with Energy-Dispersive X-ray Spectroscopy（EDS）.The X-ray diffraction analysis（XRD） was employed to characterize the crystal structure of composite.The results indicate that the titania film contains the Ca and P elements on titanium substrate after MAO,which converts into the hydroxyapatite crystals via hydrothermal treatment.The smaller size and amount of hydroxyapatite crystals are found when lower voltage is presented.But there are converse phenomena with higher voltage,especially,the differences can be neglected above 400 V.It is shown that the micro-hole and hollow surface of titania film can induce the hydroxyapatite nucleation and growth as two different forming ways.The hydroxyapatite has a preference of forming in hollow surface with lower voltage,however,the presences of the micro-hole and hollow surface of titania film are occurring for higher voltage.The hydroxyapatite forming in micro-hole shows needle-like crystal and high bonding strength with surrounding titania film because of the mechanical restrict force from micro-hole wall.Also it is noted that hydroxyapatite crystals incline to precipitate on the film surface with high Ca and P concentrations after the hydrohermal treatment.更多还原