PS/CF复合粉末激光选区烧结工艺研究

为提高聚苯乙烯粉末烧结件的强度,制备了聚苯乙烯/碳纤维(PS/CF)复合粉末,采用正交实验方法研究了不同工艺参数对PS/CF复合粉末SLS烧结件弯曲强度的影响,确定了最优工艺参数。结果表明,复合粉末试样的弯曲强度最高可达7.49 MPa,比纯PS粉提高2.88倍;弯曲强度随扫描速度和层厚的增大而减小,随预热温度的增加而增大;PS/CF复合粉末的最优工艺参数为扫描速度1 800 mm/s,预热温度85℃,层厚0.18 mm。

Study on Process of PS/CF Composite Powders Based on Selective Laser Sintering

To improve the bending strength of polystyrene powders sintered specimens,a kind of PS/CF composite powders were prepared. The effect of some important factors on bending strength of the selective laser sintered specimens were analyzed by using the method of orthogonal test. The optimum process parameters were obtained. The results show that the maximum bending strength of the composite powders specimens can reach 7.49 MPa and is increased by 2.88 times than that of PS powder. The bending strength decreases with the increase of laser scanning speed and powder layer thickness,while increases with the increasing of preheating temperature. The optimum process parameters show that laser scanning speed is 1 800 mm/s, preheating temperature is 85℃and powder layer thickness is 0.18 mm.