摘要
采用溶胶凝胶法(sol-gel)在钛合金(Ti6Al4V)基材表面合成了纳米结构的羟基磷灰石(HA)涂层,利用扫描电镜和X-射线衍射仪分析了涂层的组成和结构,采用划痕仪测定了涂层的结合强度。结果表明:用sol-gel法成功合成了均匀无开裂的HA涂层,HA晶粒尺寸为33-60nm。热处理气氛对涂层的成分和结构有直接影响,氮气保护700℃下合成的涂层是单一的HA成分,和基材结合强度较高;而空气中700℃时Ti6Al4V基材会被氧化生成TiO(2金红石型),因此合成的是HA/TiO2复合涂层,产生氧化层会严重破坏涂层与基材的结合强度。
Nanostructured hydroxyapatite（HA） coatings was prepared on Ti6Al4V substrates by using a sol-gel method.Precursor sols was prepared by calcium nitrate（Ca（NO3）2·4H2O） and phosphorus pentoxide（P2O5）,and then sol was dipping-coated on the substrates and heated in a experimental furnace.The organization and structure of the coatings were analyzed by XRD and SEM.The bond strength of coatings was assessed using a scratch tester.Results indicate that uniform and crack-free HA films were obtained by sol-gel and microwave synthesizing.33~60nm HA grains were formed at 700℃.Pure HA coatings with high bond strength were synthesized in nitrogen.However,Ti6Al4V substrates surface was oxidized to tetragonal TiO2 in air at 700℃,so HA/TiO2 composite coatings were synthesized,which will seriously reduce the bond strength.
出处
《胶体与聚合物》
2012年第3期106-108,共3页
Chinese Journal of Colloid & Polymer
