生物玻璃-纳米羟基磷灰石梯度涂层的制备及检测

Preparation and characterization of the BG-nHA gradient coatings

目的研究生物玻璃-纳米羟基磷灰石梯度涂层(BG-nHA)的表征以及涂层与钛合金(Ti-6Al-4V)之间的结合能力。方法用低温烧结法在钛合金表面制备生物玻璃-纳米羟基磷灰石梯度涂层,通过SEM、能谱分析仪(EDS)、X射线衍射仪(XRD)、红外傅利叶变换分析仪(FITR)等对涂层表征进行检测,材料在Tris-HCL缓冲液中行浸泡试验,依据ISO13779-4:2002标准用抗拉试验测试梯度涂层在浸泡前后与金属基质之间的结合强度,同时测定涂层材料释放的离子和丢失重量。结果电镜结果显示梯度涂层呈多孔状,表面分布均匀的杆状纳米羟基磷灰石晶体,基底部与钛合金形成致密结合,未发现细微的裂纹。抗拉试验显示梯度涂层与钛合金结合强度达到(39.7±4.4)MPa。随着浸泡时间的延长,涂层材料的重量有部分丢失,释放的离子逐渐增加。结论采用低温烧结法可以制备生物玻璃-纳米羟基磷灰石梯度涂层,这种加入生物活性玻璃的梯度涂层可以加强涂层与钛合金的结合能力。

Objective This study was undertaken to examine the material characteristics of BG-nHA gradient coatings and the bonding behaviour of the interface between the BG-nHA gradient coating and titanium alloy （Ti-6Al-4V） substrate. Methods The BG-nHA gradient coatings were prepared on the titanium alloy by using hypothermy sintering technology and the characteristics of coatings were evaluated by SEM,EDS,XRD and FITR. The bonding strength between the gradient coatings and the alloy substrate was tested according to ISO 13779-4：2002 before and after immersion in Tris- HCL buffer solution. The mass loss of the gradient coating and the ion released were determined. Results The results showed that the gradient coatings were porous and its surface were composed of red-like nano-HA crystals. The interface between the coating and titanium alloy was dense and no cracks were found at the interface. The bond strength between coating and Ti-6Al-4V was 39.7±4.4Mpa. The mass loss and released ion increased gradually when immersed in Tris-HCL buffer solution. Conclusion The BG-nHA gradient coatings can be prepared by the hypothermy sintering technology and the bioacUve glass reinforced nano-HA coatings have high bond strength to titanium alloy substrate.