Fernández-Pradas J M, Serra P, Morenza J L, De Aza P N
Department de Física Aplicada i Optica, Universitat de Barcelona, Spain.
Biomaterials. 2002 May;23(9):2057-61. doi: 10.1016/s0142-9612(01)00335-0.
Pseudowollastonite (alpha-CaSiO3) is a bioactive ceramic material that induces direct bone growth. A process to obtain pseudowollastonite coatings that may be applied to implants is described and evaluated in this work. The coatings were first deposited on titanium alloy by laser ablation with a pulsed Nd:YAG laser tripled in frequency. After deposition, they were submitted to a soft laser treatment with a continuous wave Nd:YAG infrared laser. Coatings were characterised by X-ray diffractometry, Raman spectroscopy, scanning electron microscopy and energy dispersive spectroscopy before and after the laser treatment. As-deposited coatings are composed of pseudowollastonite and amorphous material. They have a porous structure of gathered grains and poor cohesion. After the laser treatment the coatings crystallinity and cohesion are improved. The laser treatment also makes the coatings dense and well adhered to the substrate. Therefore, this two-step process has been demonstrated as a valuable method to coat titanium implants with pseudowollastonite.
假硅灰石（α-CaSiO₃）是一种可诱导骨直接生长的生物活性陶瓷材料。本文描述并评估了一种可应用于植入物的获得假硅灰石涂层的工艺。首先用三倍频脉冲Nd:YAG激光通过激光烧蚀在钛合金上沉积涂层。沉积后，用连续波Nd:YAG红外激光对其进行软激光处理。在激光处理前后，通过X射线衍射、拉曼光谱、扫描电子显微镜和能量色散光谱对涂层进行表征。沉积态涂层由假硅灰石和非晶态材料组成。它们具有聚集颗粒的多孔结构且结合力差。激光处理后，涂层的结晶度和结合力得到改善。激光处理还使涂层致密且与基底良好附着。因此，这一两步工艺已被证明是用假硅灰石涂覆钛植入物的一种有价值的方法。
