摘要由于优良的物理、化学性能，钛成为了植入物材料的首选。但钛与骨组织之间仅为简单的机械锁合，且钛离子对生物体的毒副作用还尚待研究，因此需要在钛表面涂覆羟基磷灰石以改善其生物性能。等离子喷涂是目前最常用的方法，但却不适合形状复杂的基体而且羟基磷灰石涂层的结合力较弱，易脱落。化学方法在基体表面生成的转化膜能与基体结合紧密，可以作为中间层提高羟基磷灰石与钛之间的结合力。但钛耐腐蚀性强，一般化学转化法难以在其表面形成转化膜。鉴于此，本文首先采用水热处理法在钛表面制备磷酸锌涂层，然后再通过第二步水热处理合成磷酸锌-羟基磷灰石复合涂层。86797

用扫描电子显微镜、X射线衍射仪、三维轮廓仪、接触角测量仪等进行表征，分别对制备磷酸锌涂层的最佳温度和溶液最佳浓度以及磷酸锌-羟基磷灰石复合涂层的最佳合成温度进行研究。实验证明，使用有0。36mol/L ZnO，1。16mol/L H3PO4，0。63mol/L HNO3的磷酸锌溶液为介质，在280℃条件下水热处理24h制备的磷酸锌涂层最佳；使用有0。5mol/L CaCl2的溶液为介质，在200℃条件下水热处理12h制备的羟基磷灰石涂层最佳。

毕业论文关键词：钛；水热处理；磷酸转化膜；羟基磷灰石

Abstract  Because of excellent physical and chemical properties, Titanium (Ti) has become the most preferred implant material。 But there is only simple mechanical bonding between titanium and biological tissue, nevertheless, side effects of titanium ions toxic on the organism is worrying。 So it is necessary to coat titanium surface with biocompatible hydroxyapatite (HA)。 The most widely used technology is plasma spray, but the method is not suitable for implant with complex shape, besides, the binding force between hydroxyapatite coating and Ti is low and coating is still easy to peel off。 Convention coating by chemical method usually attaches to metal substrate firmly, and thereby can be employed as a transition layer between Ti and HA coating to improve the bonding strength。 However, Ti has good corrosion resistance and a convention coating cannot be prepared by commonly used method。 To solve the problem in this study, a two-step hydrothermal treatment was employed to fabricate phosphate conversion coating (PCC) first and then PCC-HA composite coating。

  Surface characterizations instruments such as scanning electron microscopy, X-ray differentiation and contact angle meter were employed to evaluate the effects of temperature and concentration on properties of PCC and PCC-HA coatings。 It is found, 0。36mol/L ZnO, 1。16mol/L H3PO4,0。63mol/L HNO3, 280℃ was the optimum condition for PCC fabrication and 0。5mol/L CaCl2 solution, 200℃ was the best hydrothermal synthesis condition for PCC-HA composite coating。

Keywords: Titanium; Hydrothermal treatment; Phosphate convention coating; Hydroxyapatite

目   录

第一章 绪论 ··1

1。1 生物材料··1

1。2 生物医用金属材料··1

1。2。1 金属及其合金的显微组织···1

1。2。2 金属的物理和机械性能··2

1。2。3 金属的生物相容性2

1。2。4 杀菌清洗3

1。2。5 医学生物金属的失效···3

1。2。6 医用钛及其合金···5

1。3 HA制备方法·6

1。3。1 等离子喷涂HA涂层研究·7

1。3。2 其他制备方法··8

1。4 总结9

1。5 研究思路及内容·9

1。5。1 研究思路9

1。5。2 研究内容9

第二章 实验部分10