PS对PS/CF复合材料SLS烧结件力学性能及成型精度的影响

Effect of PS on Mechanical Properties and Precision of SLS Sintered Parts with PS/CF Composite

以聚苯乙烯(PS)作为基体材料制备了聚苯乙烯/碳纤维(PS/CF)复合粉末材料,在激光功率为30 W,预热温度为80℃和分层厚度为0.25mm等条件下,研究了基体材料的粒径及含量对PS/CF复合材料选择性激光烧结件的力学性能及成型精度的影响。结果表明,制得的PS/CF复合粉末材料的粒径满足选择性激光烧结工艺(SLS)的要求;当基体材料的平均粒径为75μm,PS与CF的质量比为9∶1时,PS与CF之间的融合效果最佳;此时弯曲、拉伸和冲击强度分别可达6.88、2.97MPa和2.98kJ/m^2,x向、y向及z向的尺寸偏差绝对值仅为0.8%、0.22%、1.6%;与相同粒径的纯PS相比,弯曲、拉伸和冲击强度分别提高了62.06%、74.29%、83.95%,x向、y向及z向尺寸精度分别提高了5.44%、69.44%、81.34%。

Polystyrene/carbon fiber （PS/CF） composite powders were prepared by using polystyrene （PS） as matrix material, and then the SLS parts were prepared with this composite powders at a preheating temperature of 80℃ with a laser power of 30 W and a delamination thickness of 0.25 mm. The effects of particle size and content of matrix material on the mechanical properties and precision of SLS parts were studied intensively. The results indicated that the particle size of the composite powders met the requirement of SLS technology. When the mean particle size was 75/ml and the PS/CF mass ratio is 9 ： 1, the fusion effect between PS and CF was optimal. The bending, tensile and impact strength of the sintered parts reached 6. 88 MPa, 2.97 MPa and 2.98 kJ/m2, respectively, and meanwhile their absolute dimensional deviations were only 0.8 %, 0.22 % and 1.6 % in x, y and z directions, respectively. Compared to the sintered parts made from pure PS under the same condition, the sintered parts made from the composite exhibited an increase in bending strength by 62. 06 %, in tensile strength by 74. 29 % and in impact strength by 83.95 %, and their dimensional accuracy increased by 5.44%, 69.44 % and 81.34 % in x, y and z directions, respectively.