摘要
用电化学沉积法在钛合金上形成涂层，随后在碱性过热蒸气中进行水热处理，最后进行高温真空烧结．用扫描电镜（ＳＥＭ）、Ｘ射线衍射（ＸＲＤ）和红外光谱（ＩＲ）对涂层的组织结构和化学成分进行分析，测量了涂层的粘接拉伸强度，将涂层浸泡于Ｔｙｒｏｄｅ生理盐液中考察其抗溶解特性．实验结果表明：电化学沉积涂层中的ＣａＨＰＯ４·２Ｈ２Ｏ经碱性蒸气处理后转变成羟基磷灰石，随处理温度的升高，羟基磷灰石的含量增加，在合适的条件下可得到纯羟基磷灰石涂层；纳米级针状羟基磷灰石晶体凝结成球状聚集物，组成大块状，保持了ＣａＨＰＯ４·２Ｈ２Ｏ的形态；一定温度的高温真空烧结并未使羟基磷灰石发生分解，却能显著提高涂层的结合强度；涂层在Ｔｙｒｏｄｅ生理盐液中浸泡１２个月后。
Pre_coatings consisting completely of CaHPO42H2O were fabricated by electro_chemical deposition from aqueous electrolytes containing Ca and P ions. Pre_coating specimens were then treated by hydrothermal process and subsequently sintered in vacuum at different temperatures. The bonding strength of the coatings was measured, and the coatings were immersed in Tyrode's solution for testing. Scanning electron microscopy (SEM), X-ray diffraction (XRD)and infrared spectroscopy(IR) were used to characterize the morphology, structure and chemical composition of the coatings. The results show that after alkaline steam treatment, CaHPO42H2O is transformed into hydroxyapatite(HA),and the content of HA in the coating increases with the steam temperature. Pure HA coating can be synthesized at 150 for 8 h.Many plate_like particles similar to CaHPO42H2O crystals are found in the coatings treated in alkaline steam. These plate_like particles are composed of spherical aggregates formed by nano_needle_like HA cryst
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1999年第3期351-356,共6页
Journal of The Chinese Ceramic Society
基金
中法先进研究计划资助
国家自然科学基金
教育部"跨世纪人才培养计划"资助
关键词
羟基磷灰石
生物材料
涂层
医用材料
生物陶瓷
hydroxyapatite, bio_coating, bio_materials, implantals. After sintered in vacuum at high temperature, the coatings do not decompose, but the bonding strength of the coatings can be improved with the increase of sintering temperature. Immersion in Tyrode's
