Lopez-Esteban S, Gutierrez-Gonzalez C F, Gremillard L, Saiz E, Tomsia A P
Materials Sciences Division, 62R0203, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
J Biomed Mater Res A. 2009 Mar 15;88(4):1010-21. doi: 10.1002/jbm.a.31935.
Graded bilayered glass-ceramic composite coatings on Ti6Al4V substrates were fabricated using an enameling technique. The layers consisted of a mixture of glasses in the CaO-MgO-Na(2)O-K(2)O-P(2)O(5) system with different amounts of calcium phosphates (CPs). Optimum firing conditions have been determined for the fabrication of coatings having good adhesion to the metal, while avoiding deleterious reactions between the glass and the ceramic particles. The final coatings do not crack or delaminate. The use of high-silica layers (>60 wt % SiO(2)) in contact with the alloy promotes long-term stability of the coating; glass-metal adhesion is achieved through the formation of a nanostructured Ti(5)Si(3) layer. A surface layer containing a mixture of a low-silica glass ( approximately 53 wt % SiO(2)) and synthetic hydroxyapatite particles promotes the precipitation of new apatite during tests in vitro. The in vitro behavior of the coatings in simulated body fluid depends both on the composition of the glass matrix and the CP particles, and is strongly affected by the coating design and the firing conditions.
采用搪瓷技术在Ti6Al4V基体上制备了梯度双层玻璃陶瓷复合涂层。这些涂层由CaO-MgO-Na₂O-K₂O-P₂O₅体系中含有不同量磷酸钙（CPs）的玻璃混合物组成。已经确定了最佳烧结条件，用于制备与金属具有良好附着力的涂层，同时避免玻璃与陶瓷颗粒之间的有害反应。最终涂层不会出现裂纹或分层。与合金接触的高硅层（>60 wt% SiO₂）的使用促进了涂层的长期稳定性；通过形成纳米结构的Ti₅Si₃层实现玻璃与金属的附着力。含有低硅玻璃（约53 wt% SiO₂）和合成羟基磷灰石颗粒混合物的表面层在体外测试期间促进新磷灰石的沉淀。涂层在模拟体液中的体外行为既取决于玻璃基体和CP颗粒的组成，也受到涂层设计和烧结条件的强烈影响。
