Clèries L, Martínez E, Fernández-Pradas J M, Sardin G, Esteve J, Morenza J L
Departament de Física Aplicada i Optica, Universitat de Barcelona, Spain.
Biomaterials. 2000 May;21(9):967-71. doi: 10.1016/s0142-9612(99)00240-9.
Amorphous calcium phosphate and crystalline hydroxyapatite coatings with different morphologies were deposited onto Ti-6Al-4V substrates by means of the laser ablation technique. The strength of adhesion of the coatings to the substrate and their mode of fracture were evaluated through the scratch test technique and scanning electron microscopy. The effect of wet immersion on the adhesion was also assessed. The mechanisms of failure and the critical load of delamination differ significantly depending on the phase and structure of the coatings. The HA coatings with granular morphology have higher resistance to delamination as compared to HA coatings with columnar morphology. This fact has been related to the absence of stresses for the granular morphology.
通过激光烧蚀技术将具有不同形态的非晶态磷酸钙和结晶羟基磷灰石涂层沉积到Ti-6Al-4V基体上。通过划痕试验技术和扫描电子显微镜评估涂层与基体的附着力强度及其断裂模式。还评估了湿浸对附着力的影响。失效机制和分层临界载荷根据涂层的相和结构有显著差异。与柱状形态的HA涂层相比，颗粒状形态的HA涂层具有更高的抗分层能力。这一事实与颗粒状形态不存在应力有关。
