Fernández-Pradas J M, Clèries L, Sardin G, Morenza J L
Departament de Física Aplicada i Optica, Universitat de Barcelona, Spain.
Biomaterials. 2002 May;23(9):1989-94. doi: 10.1016/s0142-9612(01)00327-1.
Calcium phosphate coatings were deposited by pulsed laser ablation with a radiation of 355 nm from a Nd:YAG laser. All the coatings were obtained at the same conditions, but deposition was stopped after different number of pulses to get coatings with different thickness. The influence of thickness in the structural and mechanical properties of the coatings was investigated. Coatings structure was characterised by scanning electron microscopy, grazing incidence X-ray diffractometry and Raman spectroscopy. The mechanical properties were evaluated by scratch test. The morphology of the coatings is dominated by the presence of droplets. The coatings are composed mainly of hydroxyapatite, alpha tricalcium phosphate and amorphous calcium phosphate. Thinner coatings withstand higher loads of failure in the scratch test.
通过使用Nd:YAG激光器发出的355nm辐射进行脉冲激光烧蚀来沉积磷酸钙涂层。所有涂层均在相同条件下获得，但在不同脉冲数后停止沉积以获得不同厚度的涂层。研究了厚度对涂层结构和力学性能的影响。通过扫描电子显微镜、掠入射X射线衍射和拉曼光谱对涂层结构进行了表征。通过划痕试验评估力学性能。涂层的形态主要由液滴的存在主导。涂层主要由羟基磷灰石、α-磷酸三钙和无定形磷酸钙组成。较薄的涂层在划痕试验中能承受更高的失效载荷。
