聚苯乙烯/聚酰胺-12合金的选择性激光烧结成形

Selective Laser Sintering of Polystyrene/Nylon-12 Alloy

在选择性激光烧结(SLS)成形中,聚苯乙烯(PS)成形件精度高但其力学性能差,而聚酰胺-12(PA12)成形件力学性能高但其尺寸精度较差。为此,通过添加增容剂合成了PS/PA12合金粉末并用于SLS成形,研究了PS/PA12合金、PS及PA12成形件的力学性能、精度及断口微观形貌。结果表明,PS/PA12合金成形件的拉伸强度、断裂伸长率、冲击强度、弯曲强度及弯曲模量分别是PS成形件的4.72倍、1.94倍、4.92倍、4.57倍及1.37倍;PS/PA12合金粉末成形件在x、y及z方向的尺寸误差比PA12分别降低了46.9%,47.3%及20.3%。说明PS/PA12合金粉末成形件兼顾了PS成形件精度高及PA12成形件力学性能好的优点,具有较高的推广使用价值。

With the selective laser sintering （SLS） technology, the polystyrene （PS） parts can be made with high dimensional precisions and low mechanical properties, whereas the polyamide-12 （PA12） parts possess higher mechanical properties and lower accuracies, compared with the PA ones. For high properties and accuracies, the PS/ PA12 alloy powder was prepared. To evaluate the mechanical properties, dimensional precisions, and fraetographs＇s features, the SIS specimens were made from PS, PA12 and PS/PA12 alloy powders, respectively. From the tests results, the mechanical properties of the parts from the alloy powder are higher than those of the PS parts. And the dimension errors from the parts with the alloy powder are much lower than those of the PA12 parts.