Ding S J, Su Y M, Ju C P, Lin J H
Institute of Dental Materials, Chung-Shan Medical and Dental College, Taichung, Taiwan, ROC.
Biomaterials. 2001 Apr;22(8):833-45. doi: 10.1016/s0142-9612(00)00247-7.
The microstructure and properties of a series of plasma-sprayed coatings from sinter-granulated powders fabricated from SiO2, CaO, P2O5 and Na2O-containing HA composite powders on Ti-6Al-4V substrate were reported. The immersion behavior of these coatings in a simulated body fluid (SBF) was also investigated. The results showed that sinter-granulated apatite-matrix powders were irregularly shaped and appeared quite similar. XRD patterns showed that during fabrication of the powders, P2O5 and SiO2 enhanced the decomposition of HA structure, while CaO and Na2O did not. Reasonably high bond strengths (45-50 MPa) were obtained from all coatings. The plasma spray process itself enhanced the decomposition of apatite and chemical reactions among different phases. When immersed in SBF, the intensities of such phases as alpha- and beta-TCP in all coatings decreased with immersion time and an apatite precipitation took place on all coating surfaces. The immersed SiO2- and CaO-containing HA (HSC) coating had the highest rate of apatite precipitation among all coatings. The variations in calcium ion concentration in simulated body fluid indicated that the HSC-immersed solution reached its maximal Ca concentration the earliest, while the HSCP (HA, SiO2, CaO and P2O5)-immersed solution reached its maximum the latest.
报道了一系列由含SiO₂、CaO、P₂O₅和Na₂O的HA复合粉末制成的烧结造粒粉末在Ti-6Al-4V基体上进行等离子喷涂涂层的微观结构和性能。还研究了这些涂层在模拟体液（SBF）中的浸泡行为。结果表明，烧结造粒的磷灰石基体粉末形状不规则且看起来非常相似。XRD图谱表明，在粉末制备过程中，P₂O₅和SiO₂促进了HA结构的分解，而CaO和Na₂O则没有。所有涂层都获得了相当高的结合强度（45-50MPa）。等离子喷涂过程本身促进了磷灰石的分解以及不同相之间的化学反应。当浸泡在SBF中时，所有涂层中α-和β-TCP等相的强度随浸泡时间降低，并且在所有涂层表面都发生了磷灰石沉淀。在所有涂层中，浸泡的含SiO₂和CaO的HA（HSC）涂层的磷灰石沉淀速率最高。模拟体液中钙离子浓度的变化表明，浸泡HSC的溶液最早达到其最大钙浓度，而浸泡HSCP（HA、SiO₂、CaO和P₂O₅）的溶液最晚达到其最大值。
