碳／碳复合材料基体上羟基磷灰石涂层的体外生物活性

摘要

通过分析碳／碳复合材料表面等离子喷涂羟基磷灰石（简称HA）涂层在模拟体液中浸泡后的钙离子浓度和pH值的变化，涂层表面沉积物的微观结构、相组成和钙、磷原子数比，研究了该涂层的体外生物活性。结果表明：随着浸泡时间的延长，浸泡液的钙离子浓度降低，pH值升高，涂层表面的CaO完全溶解，α—TCP和β-TCP轻微溶解；涂层表面的沉积物主要是晶相HA，涂层具有良好的体外生物活性。%Hydroxyapatite （HA） coatings on carbon/carbon composites deposited by a plasma spraying technique were immersed in a simulated body fluid （SBF）. By analyzing the change of calcium ion concentration and pH value, microstructure, phase composition and calcium to phasphorus ratio of the precipitates on HA coatings, the bioactivity in vitro of HA coatings was discussed. The results show that the calcium ion concentration decreased and the pH value increased with increasing the immersing time. The CaO on the coating surface dissolved completely and the α-TCP and β-TCP dissolved slightly. The precipitation deposited on the surface of coatings was mainly composed of crystalline HA, and the coatings had excellent bioactivity in vitro.