Wang D G, Chen C Z, Ma J, Zhang G
School of Materials Science and Engineering, Shandong University, Jinan, PR China.
Colloids Surf B Biointerfaces. 2008 Oct 15;66(2):155-62. doi: 10.1016/j.colsurfb.2008.06.003. Epub 2008 Jun 19.
HA bioceramic coatings were synthesized on titanium substrate by laser cladding using cheap calcium carbonate and calcium hydrogen phosphate. The thermodynamic condition for synthesizing HA was calculated by software Matlab 5.0, the microstructure and phase analysis of laser clad HA bioceramic coatings were studied by electron probe microanalyser (EPMA), X-ray diffractometer (XRD) and transmission electron microscopy (TEM). The theoretical results show that the Gibbs free enthalpy for the synthesis of HA phase is satisfied, and the presence of HA phase in the clad coatings was then further verified by XRD and the selected area diffraction patterns. When the laser power is 600W and the scanning speed is 3.5mm/s, the compact HA bioceramic coatings were obtained, which have cellular dendritic structure and consist of the phases of HA, alpha-Ca(2)P(2)O(7), CaO and CaTiO(3).
采用廉价的碳酸钙和磷酸氢钙，通过激光熔覆在钛基体上合成了羟基磷灰石（HA）生物陶瓷涂层。利用Matlab 5.0软件计算了合成HA的热力学条件，通过电子探针微分析仪（EPMA）、X射线衍射仪（XRD）和透射电子显微镜（TEM）研究了激光熔覆HA生物陶瓷涂层的微观结构和相分析。理论结果表明，合成HA相的吉布斯自由焓是满足的，然后通过XRD和选区衍射图进一步验证了熔覆涂层中HA相的存在。当激光功率为600W、扫描速度为3.5mm/s时，获得了致密的HA生物陶瓷涂层，其具有胞状树枝晶结构，由HA、α-Ca₂P₂O₇、CaO和CaTiO₃相组成。
