激光选区熔化工艺参数对成形多孔支架表面质量的影响研究

Effect of SLM Technology Process Parameters on Tissue Defects of Porous Scaffolds

通过调整激光选区熔化工艺参数中的激光功率、扫描速度和扫描间距,优化多孔支架的表面质量。实验结果表明:微孔支架表面的缺陷主要有微裂纹和孔洞等;随着扫描功率的逐渐增加,孔洞和微裂纹缺陷明显减少,多孔支架的致密度也随之增加;但随着扫描速度和扫描间距的逐渐增大,孔洞和微裂纹缺陷增加,多孔支架的致密度和综合力学性能也随之降低。实验表明:当工艺参数为S=0.05 mm,P=130 W,V=500 mm/s时,微孔支架表面的缺陷最少,表面质量最优,并且其致密度最高为96.41%,其抗压强度达到最大为583 MPa。

The surface quality of the porous scaffold was optimized by adjusting the laser power,scanning speed,and scanning spacing in the laser selective melting process parameters.The experimental results show that:the defects on the surface of the microporous scaffold are mainly microcracks and holes;as the scanning power gradually increases,the defects of the holes and microcracks are significantly reduced,and the density of the porous scaffold also increases;however,as the scanning speed and the gradual increase of scanning distance,the increase of pores and micro-crack defects,the dense and comprehensive mechanical properties of porous scaffolds decrease.Experiments show that when the art parameters are S=0.05 mm,P=130 W,V=500 mm/s,the surface of the microporous scaffold has the fewest defects,the best surface quality,and its highest density is 96.41%,and its compressive strength reaches the maximum.It was 583 MPa.