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为了在钛合金表面获得具有生物活性和生物相容性的陶瓷成分涂层,运用梯度设计思想,采用宽带激光梯度激光熔覆技术,在钛合金表面制备添加不同含量Y2O3+CeO2混合稀土氧化物的陶瓷成分涂层。利用X衍射全自动测试仪(XRD)、扫描电镜(SEM)、激光共聚焦显微镜(CLSM),研究不同混合稀土氧化物含量对涂层生物活性的影响。结果表明:固定0.4%(质量分数)Y2O3,CeO2的添加量在0%~0.8%变化,当CeO2的添加量在0.2%~0.4%时,激光熔覆过程中催化合成的生物活性相HA和β-TCP最多,经模拟体液(SBF)浸泡14 d后,涂层表面的类骨磷灰石最多且分布均匀。细胞学实验也表明,涂层表面细胞生长正常且数量最多。因此,含0.2%~0.4%CeO2的梯度生物陶瓷成分涂层具有最佳的生物活性。
In order to obtain bioactive and biocompatible ceramic coating on titanium alloy surface, using the gradient design idea and broadband laser gradient laser cladding technology, the mixed rare earth oxides with different contents of Y2O3 + CeO2 were prepared on the surface of titanium alloy Ceramic composition coating. XRD, SEM and CLSM were used to study the effect of different mixed rare earth oxides on the biological activity of the coatings. The results show that when the content of CeO2 is 0.4% (mass fraction), the addition amount of CeO2 varies from 0% to 0.8%. When CeO2 is added from 0.2% to 0.4%, the bioactive phase HA and β-TCP up to 14 days after immersion in simulated body fluid (SBF), the bone-like apatite surface was the most distributed and uniform. Cytology experiments also show that the coating surface cells grow normally and the largest number. Therefore, the gradient bioceramic coating containing 0.2% ~ 0.4% CeO2 has the best bioactivity.