Kim Hyunbin, Camata Renato P, Lee Sukbin, Rohrer Gregory S, Rollett Anthony D, Vohra Yogesh K
Department of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Acta Mater. 2007 Jan;55(1):131-139. doi: 10.1016/j.actamat.2006.08.008.
The orientation texture of pulsed laser deposited hydroxyapatite coatings was studied by X-ray diffraction techniques. Increasing the laser energy density of the KrF excimer laser used in the deposition process from 5 to 7 J/cm(2) increases the tendency for the c-axes of the hydroxyapatite grains to be aligned perpendicular to the substrate. This preferred orientation is most pronounced when the incidence direction of the plume is normal to the substrate. Orientation texture of the hydroxyapatite grains in the coatings is associated with the highly directional and energetic nature of the ablation plume. Anisotropic stresses, transport of hydroxyl groups and dehydroxylation effects during deposition all seem to play important roles in the texture development.
采用X射线衍射技术研究了脉冲激光沉积羟基磷灰石涂层的取向织构。在沉积过程中，将用于沉积的KrF准分子激光的能量密度从5 J/cm²提高到7 J/cm²，会增加羟基磷灰石晶粒的c轴垂直于基底排列的趋势。当羽流的入射方向垂直于基底时，这种择优取向最为明显。涂层中羟基磷灰石晶粒的取向织构与烧蚀羽流的高方向性和高能性质有关。沉积过程中的各向异性应力、羟基的传输和脱羟基效应似乎都在织构形成过程中发挥着重要作用。
