悬浮液等离子喷涂备生物陶瓷涂层

发布时间：2018-06-16 01:34

  本文选题：悬浮液等离子喷涂 + 氟磷灰石　； 参考：《华中科技大学》2012年硕士论文

【摘要】：在钛合金（Ti6Al4V）基体表面涂覆具有生物活性的生物陶瓷涂层，综合利用钛合金的机械性能和生物陶瓷的生物活性，是当今最具应用前景的骨植入体研究热点之一。羟基磷灰石（HA）是目前研究最为成熟的生物陶瓷材料，具有优异的生物相容性和骨诱导性。然而，，Ti6Al4V与HA的力学性能差别大，基体和涂层界面结合强度低，一般都低于20MPa；HA在体液环境中溶解速度快，涂层容易造成脱落。氟磷灰石（FA）能促进磷酸钙矿化和结晶化，同时FA在体液中溶解速度比HA慢。FA的引入可以改善涂层结构性能。 本论文通过对钛合金基体进行微弧氧化预处理，在基体表面形成多孔二氧化钛（TiO2）层，用悬浮液等离子喷涂方法依次涂覆FA层和HA层，制备TiO2-FA-HA复合结构的生物陶瓷涂层。利用扫描电镜（SEM）、X射线衍射仪（XRD）、傅里叶红外光谱仪（FTIR）分析涂层形貌结构及其化学相组成，采用拉伸机测量涂层的结合强度。 本文主要研究了羟基磷灰石悬浮液的制备方法和悬浮液等离子喷涂工艺参数对涂层性能的影响。悬浮液的适宜浓度为：5wt%的羟基磷灰石，0.5wt%的十水焦磷酸钠（Na_4P_2O_7·10H_2O）作为分散剂。HA悬浮液的Zeta电位为-33.8mV，平均粒径分布为76.02nm；FA悬浮液的Zeta电位为-34.0mV，平均粒径分布为70.17nm。HA涂层的结合强度为24.2MPa，FA涂层的结合强度为26.8MPa。涂层出现CaO，α-TCP和β-TCP等非晶相，通过后期800℃热处理可以提高涂层的结晶度。结果表明制备的涂层具有良好的结晶度和结合强度。
[Abstract]:It is one of the most promising bone implants to coat bioceramic coatings with bioceramics on Ti 6Al4V substrates and to make full use of the mechanical properties of titanium alloys and bioceramics. Hydroxyapatite (HA) is the most mature bioceramic material with excellent biocompatibility and bone inductivity. However, the mechanical properties of Ti6Al4V and HA differ greatly, the bonding strength between substrate and coating is low, the dissolution rate of Ti6Al4V is lower than 20MPA HA in humoral environment and the coating is easy to fall off. Fluoroapatite (FA) can promote the mineralization and crystallization of calcium phosphate, and the incorporation of FA in body fluid can improve the structure and properties of the coating. In this paper, a porous TIO _ 2 / TIO _ 2 layer was formed on the surface of titanium alloy by micro-arc oxidation pretreatment. The ceramic coating with TIO _ 2-FA-HA composite structure was prepared by suspension plasma spraying method, which was coated with FA layer and HA layer in turn. The morphology, structure and chemical phase composition of the coating were analyzed by SEM and FTIR. The bonding strength of the coating was measured by tensile machine. In this paper, the preparation method of hydroxyapatite suspension and the effect of plasma spraying parameters on the coating properties were studied. The optimum concentration of the suspension was 0.5 wt% hydroxyapatite and 0.5 wt% sodium pyrophosphate (Na4P2O7H2O2) as dispersant. The Zeta potential of HA suspension was -33.8 MV, and the average particle size distribution was 76.02 nm. The Zeta potential of FA suspension was -34.0mV, and the average particle size distribution was 70.17nm.HA coating. Amorphous phases such as Cao, 伪 -TCP and 尾 -TCP appear in the coating, and the crystallinity of the coating can be improved by heat treatment at 800 鈩

本文编号：2024614