仿生磷灰石涂层与钛基体结合强度的划痕法实验

Scratch Testing of Adhesion of Biomimetic Apatite Coatings toTitanium Substrates

本文采用碱热处理及SBF浸泡的方法在钛片上制备了仿生磷灰石涂层 ,并采用AES进行表面成分—深度分析 ,划痕法测定磷灰石涂层与基体的结合强度。结果显示 ,经碱热处理而制得的钛表面仿生磷灰石涂层与基体结合的界面为成分梯度界面 ,二者的结合要通过成分含量呈梯度变化的过渡层 :Ca、P元素的含量从表面到基体逐渐下降 ,Ti元素的含量逐渐上升。热处理有利于提高涂层的基体结合强度 ,其原因是热处理使SBF中形成的磷灰石的晶核细小而均匀 ,使得表面涂层与基体之间的结合更为紧密。预钙化处理后形成的磷灰石涂层与金属之间仍为成分梯度界面 ,因此对涂层的基体结合强度影响不大。

In present study,biomimetic apatite coatings were prepared on titanium plates by alkali-heat treatment.The depth profiles near the surfaces were analyzed by AES and the bonding strengths between apatite layers and metal substrates were determined by scratch testing.The results showed that graded structures were formed between apatite coatings and titanium substrates:the contents of Ca and P were increased and that of Ti was decreased gradually from surfaces to substrates.Due to the densified surface and smaller and more homogeneous nucleation,bonding strengths between coatings and metals were increased by heat treatment.Pre-calcification did not destroy the graded structures at the interface and then had little influence on the bonding strength.