论文摘要
Ti及NiTi合金是典型的人体植入材料,羟基磷灰石涂层能提高Ti及NiTi的生物活性和骨传导性。为了改善羟基磷灰石涂层和基体的结合强度,本论文在羟基磷灰石涂层与Ti及NiTi基体之间制备TiO2薄膜作为过渡层,采用低温化学沉积的方法在TiO2过渡层表面制备羟基磷灰石涂层。论文对TiO2薄膜的制备方法、制备工艺及热处理对膜结构的影响进行了较为系统的研究,并比较了不同结构的TiO2薄膜对羟基磷灰石沉积过程的影响。用电镀法在Ti及NiTi表面制备TiO2薄膜。对Ti基体表面的TiO2薄膜分别进行300℃、500℃和700℃的热处理,在过饱和钙化溶液中浸泡24h,经过500℃处理的TiO2薄膜能够在24h之内沉积上一层均匀、致密的涂层。而经过300℃和700℃处理的TiO2薄膜经过沉积后沉积物不能完全覆盖基体。对NiTi基体表面的TiO2薄膜进行500℃的热处理,在过饱和钙化溶液中浸泡24h后,基体表面没有发现沉积物。用溶胶-凝胶法在Ti和NiTi形状记忆合金表面制备TiO2薄膜,经过500℃热处理后,在过饱和钙化溶液中浸泡,能够在24h之内沉积上一层均匀、致密的涂层。经过300℃和700℃处理的TiO2薄膜沉积24h后没有发现有沉积物。XRD分析表明,用电镀法在Ti表面制备TiO2薄膜,经过300℃热处理的TiO2薄膜是板钛矿,500℃处理的TiO2薄膜是锐钛矿,700℃处理的TiO2薄膜是锐钛矿和板钛矿的混合相。电镀法在NiTi表面制备TiO2薄膜经过500℃处理,表面是金红石相。溶胶-凝胶法在NiTi和Ti表面制备TiO2薄膜经过500℃处理,表面TiO2薄膜是锐钛矿相。表明锐钛矿相的TiO2薄膜在过饱和钙化溶液中诱导沉积物最有效。运用两步化学法对NiTi基体表面进行预处理,在过饱和钙化溶液中沉积3天,在基体表面形成了一层均匀、致密的沉积层。此法不需要对基体进行高温处理。扫描电镜分析表明,不同方法制备的TiO2薄膜,经过生物沉积后,表面沉积物的形貌相似,微观形貌为层片状晶体围绕成多孔的结构。片层厚度约0.1μm,涂层的厚度约25μm。对生物沉积的沉积层进行XRD分析表明,沉积层的主要成分为HA。
论文目录
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