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利用激光熔覆技术,在医用钛合金表面制备梯度稀土磷酸钙复合陶瓷涂层。采用OM、XRD、SEM、iCP-MS分别对涂层的界面结合、物相组成、显微形貌、离子溶出进行考察。结果表明:经过激光熔覆后,能够在钛合金表面得到富含HA和β-TCP的梯度磷酸钙陶瓷涂层,且涂层分为基材、合金化层、陶瓷层3个层次,各层间界面结合良好;磷酸钙陶瓷涂层不断被生理盐水降解,质量不断丢失,涂层在生理盐水中能够形成一种类骨磷灰石的新相;伴随着涂层的降解,Ca~(2+)和La~(3+)从涂层中溶出;溶液中Ca~(2+)的溶出浓度在15~40 mg/L的范围内随浸泡时间的延长呈现波动上升的趋势,La~(3+)的析出浓度却在0.15~0.45 mg/L之间随着浸泡时间的延长呈现波动下降的趋势。
Using laser cladding technology, a gradient rare earth calcium phosphate composite ceramic coating is prepared on the surface of medical titanium alloy. The interfacial bonding, phase composition, micro-morphology and ionic dissolution of the coating were investigated by OM, XRD, SEM and iCP-MS. The results show that after laser cladding, a gradient calcium phosphate ceramic coating rich in HA and β-TCP can be obtained on the surface of titanium alloy. The coating is divided into three layers: substrate, alloying layer and ceramic layer. The interface of calcium phosphate ceramic was continuously degraded by physiological saline and its quality was continuously lost. The coating could form a new phase of bone-like apatite in saline solution. With the degradation of coating, ) And La ~ (3+) were eluted from the coating. The dissolution rate of Ca ~ (2+) in the solution tended to fluctuate with the leaching time in the range of 15 ~ 40 mg / L. +) Precipitation concentration of 0.15 ~ 0.45 mg / L with the immersion time showed a downward trend in volatility.