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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裂纹,提高涂层与基材的结合强度,设计了一种梯度稀土生物陶瓷涂层,采用宽带激光熔覆技术,在TC4钛合金表面制备了含HA+β-TCP活性相的稀土活性梯度生物陶瓷复合涂层。利用SEM、XRD分析手段对涂层形貌、相组成进行了研究;通过模拟体液(SBF)浸泡实验(浸泡7、14 d)考察了生物陶瓷涂层的生物活性;利用电化学分析仪测试了生物活性陶瓷涂层的耐腐蚀性。结果表明,当稀土氧化物Nd2O3添加量为w(Nd2O3)=0.6%时,宽带激光熔覆过程中催化合成HA+β-TCP活性相的数量最多,具有优异的表面形貌;当稀土氧化物Nd2O3添加量为w(Nd2O3)=0.6%时,梯度稀土生物陶瓷涂层在SBF中浸泡不同时间点后表面沉积的类骨磷灰石相数量均较未加入Nd2O3的梯度生物陶瓷涂层多,具有最好的生物活性,且耐腐蚀性最佳。
In order to reduce the thermal cracks between the substrate and the bioceramic coating during the laser cladding and improve the bonding strength between the coating and the substrate, a gradient rare earth bioceramic coating was designed. Using the broadband laser cladding technique, The rare earth active gradient bioceramic composite coating containing HA + β-TCP active phase was prepared on the surface of titanium alloy. The morphology and phase composition of the coatings were studied by means of SEM and XRD. The bioactivity of the bio-ceramic coatings was investigated by soaking SBF immersion for 7 and 14 days. Corrosion resistance of bioactive ceramic coatings. The results show that when Nd (Nd2O3) = 0.6%, the amount of active phase of HA + β-TCP catalyzed by wideband laser cladding is the most, with excellent surface morphology. When rare earth oxides When the amount of Nd2O3 added is 0.6%, the amount of bone-like apatite phase deposited on the surface of gradient rare earth bioceramic coating immersed in SBF at different time points is more than that of the gradient bioceramic coating without Nd2O3 added. Has the best biological activity, and the best corrosion resistance.