Cedeño-Viveros Luis D, Rodriguez Ciro A, Segura-Ibarra Victor, Vázquez Elisa, García-López Erika
Tecnológico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey 64849, Mexico.
Laboratorio Nacional de Manufactura Aditiva y Digital (MADiT), Apodaca 66629, Mexico.
Materials (Basel). 2021 Dec 23;15(1):99. doi: 10.3390/ma15010099.
A novel manufacturing approach was used to fabricate metallic scaffolds. A calibration of the laser cutting process was performed using the kerf width compensation in the calculations of the tool trajectory. Welding defects were studied through X-ray microtomography. Penetration depth and width resulted in relative errors of 9.4%, 1.0%, respectively. Microhardness was also measured, and the microstructure was studied in the base material. The microhardness values obtained were 400 HV, 237 HV, and 215 HV for the base material, HAZ, and fusion zone, respectively. No significant difference was found between the microhardness measurement along with different height positions of the scaffold. The scaffolds' dimensions and porosity were measured, their internal architecture was observed with micro-computed tomography. The results indicated that geometries with dimensions under 500 µm with different shapes resulted in relative errors of ~2.7%. The fabricated scaffolds presented an average compressive modulus ~13.15 GPa, which is close to cortical bone properties. The proposed methodology showed a promising future in bone tissue engineering applications.
采用一种新型制造方法来制造金属支架。在刀具轨迹计算中使用切口宽度补偿对激光切割工艺进行校准。通过X射线显微断层扫描研究焊接缺陷。熔深和熔宽的相对误差分别为9.4%和1.0%。还测量了显微硬度，并研究了母材的微观结构。母材、热影响区和熔合区获得的显微硬度值分别为400 HV、237 HV和215 HV。在支架不同高度位置进行的显微硬度测量之间未发现显著差异。测量了支架的尺寸和孔隙率，用微型计算机断层扫描观察其内部结构。结果表明，尺寸小于500 µm且形状不同的几何形状导致的相对误差约为2.7%。制造的支架呈现出平均压缩模量约为13.15 GPa，这与皮质骨特性相近。所提出的方法在骨组织工程应用中显示出有前景的未来。
