组分配比对激光烧结PS/PA成型件性能的影响

Effect of Composition Ratio on Properties of PS/PA Parts Formed by Selective Laser Sintering

采用共聚聚酰胺(PA)粉末与聚苯乙烯(PS)粉末复合,通过选择性激光烧结机制得成型件,并对成型件的断面微观结构、尺寸精度、密度、弯曲强度以及表面粗糙度进行了表征分析,以探究不同组分配比对PS/PA复合材料成型件性能的影响。结果表明,随着PA含量的增加,PS/PA成型件内粉末颗粒的黏结程度增大,成型件弯曲断面更加平整;PS/PA比例为1∶4时,成型件尺寸精度相较于其他实验组更好;随着PA含量的增加,PS/PA复合材料成型件的密度逐渐增大,PS/PA比例为1∶2、1∶3、1∶4、1∶5时,成型件密度较大且密度值接近;随着PA含量的增加,PS/PA成型件的弯曲强度呈上升趋势,且在PS/PA比例为1∶2、1∶3、1∶4、1∶5的实验组内,成型件弯曲强度明显上升;PS/PA比例为1∶4时,成型件表面粗糙度最小。

The polyamide(PA)and polystyrene(PS)powders are compounded to prepare a series of experimental samples by a selective laser sintering machine,and the microstructure,dimensional accuracy,density,bending strength and surface roughness of the samples were characterized to explore the effect of composition ratio on the performance of the PS/PA samples.The results indicated that the bonding degree of PS and PA powders in the samples increased with an increase of PA content,and the bending section of the samples became flatter.The dimensional accuracy of the samples was better than other experimental groups at the PS/PA weight ratio of 1/4.The density of the samples also increased gradually with an increase of PA content.The density of the samples became larger and closer to each other at the PS/PA weight ratios of 1/2,1/3,1/4,and 1/5.The bending strength of the samples presented an upward trend with an increase of PA content and increased at the PS/PA weight ratios of 1/2,1/3,1/4 and 1/5.In addition,the samples exhibited a minimum in surface roughness at the PS/PA weight ratio of 1/4.