微束等离子喷涂氧化锆增韧羟基磷灰石复合涂层

Micro-plasma sprayed zirconia reinforced hydroxyapatite composite coatings

采用微束等离子喷涂方法,在Ti-6Al-4V基体上制备了羟基磷灰石+氧化锆(70HA-30ZrO2,质量分数,%)复合涂层。将复合涂层置于模拟体液中分别浸泡了3,7,14,28 d并观察表面磷灰石的生长情况以评价涂层生物活性。采用扫描电镜(SEM)和X射线衍射(XRD)分析技术对涂层浸泡前后的表面形貌和相组成进行了研究。结果表明,涂层中ZrO2主要以立方相存在;喷涂过程中羟基磷灰石(HA)出现了一定的分解,产生大量的α-Ca3(PO4)2杂质相。HA涂层熔化效果很好,但涂层中有未熔化的ZrO2颗粒。涂层在模拟体液中浸泡28 d后表面可以形成磷灰石,说明涂层具有很好的生物活性。

Hydroxyapatite(HA)+yttria stabilized zirconia(YSZ) bio-composite coatings deposited onto Ti-6Al-4V substrate through a micro-plasma spray(MPS) technique were immersed in simulated body fluid(SBF) to investigate their behavior in vitro.The formation of apatite on their surface was investigated to evaluate the bioactivity of the coatings.Surface morphologies and structure in the coatings were analyzed by scanning electron microscopy(SEM),X-ray diffractometer(XRD).Results showed that composite coatings consist...