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为了减少激光熔覆过程中基材与生物陶瓷涂层之间的热应力,提高涂层与基材的结合强度,设计了一种稀土活性生物梯度陶瓷涂层,采用宽带激光熔覆技术,在TC4合金上制备了含HA+-βTCP稀土活性梯度生物陶瓷复合涂层。利用扫描电镜(SEM)、X射线衍射(XRD)、模拟体液(SBF)以及电化学分析仪等手段对涂层组织结构、生物活性及耐腐蚀性进行了研究。结果表明,生物活性稀土梯度涂层分为基材、合金化层以及生物陶瓷层3个层次,且各梯度层之间均为良好的化学冶金结合;稀土氧化物Nd2O3在宽带激光熔覆生物陶瓷的过程中具有催化合成HA+-βTCP的作用,且当Nd2O3质量分数为0.6%时,催化合成HA+-βTCP的量最多;当Nd2O3质量分数为0.4%~0.6%时,涂层的耐腐蚀性最好且涂层表面沉积的磷灰石相的量最多,具有最佳的生物活性。
In order to reduce the thermal stress between the substrate and the bioceramic coating during the laser cladding process and improve the bonding strength between the coating and the substrate, a rare earth active bio-gradient ceramic coating was designed by adopting a broadband laser cladding technique. TC4 alloy containing HA + -βTCP rare earth active gradient bioceramic composite coating. The structure, biological activity and corrosion resistance of the coating were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), simulated body fluid (SBF) and electrochemical analyzer. The results show that the bioactive rare earth gradient coating is divided into three layers: substrate, alloying layer and bio-ceramic layer, and all the gradient layers are good chemical metallurgical bonding; rare earth oxide Nd2O3 in wideband laser cladding bioceramic The catalytic activity of HA + -βTCP catalyzed by Nd 3 O 3 was the highest when the mass fraction of Nd 2 O 3 was 0.6%. When the content of Nd 2 O 3 was 0.4% ~ 0.6%, the corrosion resistance of the coating was the highest Good and the deposition of apatite coating the largest amount of the surface, with the best biological activity.