松木粉／聚醚砜树脂复合材料的制备及选择性激光烧结试验

摘要

We developed pine/polyether sulfone composite powder ( PES) by SHR-10A high-speed mixer for selective laser sin-tering ( SLS) .The mechanical properties of wood plastic composite were reinforced with the increase of mass ratio of PES. We observed and tested deforming effect of sintered parts and the influence on the mechanical properties while putting in different energy density.The experiment showed that pine/PES wood composite could be shaped up when the energy densi-ty was 0.128 J/mm3 , when it reached 0.312 J/mm3 , the tensile strength of the material was 4.846 5 MPa, the bending strength was 8.215 2 MPa, the impact strength was 1.257 4 MPa, and the mechanical properties were the strongest.When the energy density was greater than 0.312 J/mm3 , pine would be carbonized during the process of sintering, therefore, the mechanical properties decreased.At last, we observed the section topography of sintered parts by scanning electron micros-copy ( SEM) .%以松木粉、聚醚砜树脂为材料，用SHR－10A型高速混合机制备松木粉／聚醚砜树脂复合粉末；用HRPS－ⅢA型激光粉末烧结快速成型机，遴选出复合粉末可用于选择性激光烧结工艺参数及适宜的预热温度，烧结成型。测量了不同松木粉质量比对复合粉末力学性能的影响，观察并测量了输入不同的能量密度时，烧结试件的成型效果和力学性能。结果表明：随着松木粉质量比的增加，木塑复合材料的力学性能降低。对于松木粉质量比为20％的木塑复合粉末，当输入的能量密度为0．128 J／mm3时，复合粉末即可成型；当输入的能量密度为0．312 J／mm3时，木塑复合材料的拉伸强度达到4．8465 MPa，弯曲强度为8．2152 MPa，冲击强度为1．2574 MPa，此时力学性能最强；若输入的能量密度大于0．312 J／mm3时，出现过烧现象，力学性能下降。采用扫描电镜对烧结件断面的形貌进行了表征。