气相沉积CF改性PS的选择性激光烧结

摘要

Due to the improvement of bending strength of polystyrene (PS) sintered parts was limited by ordinary carbonfiber (CF),based on the basis of previous theory and experiment,the CF was treated with vapor deposition method. Composites of PS reinforced with CF were prepared. Then prototyping experiments were carried out to demonstrate the reinforcement effect;then, the influence on bending strength owe to the content of CF was analyzed by changing mixing ratios. At last,the internal structure of sintered parts was observed and analyzed by scanning electron microscopy (SEM). The results show that the optimal ratio is composites of PS reinforced with 10％ vapor deposited CF,of which the bending strength is up to 10.17 MPa,about 76.3％ higher than that of PS. The micro morphology SEM shows that the pore volume increases with the increase of CF content,which leads to the lower strength of SLS sintered parts.%由于普通碳纤维(CF)对聚苯乙烯(PS)烧结件弯曲强度的改善有限,在前期理论及实验基础上,对CF材料做气相沉积处理,制备PS/CF复合材料,再进行选择性激光烧结(SLS)实验,验证其增强效果;然后,改变经气相沉积法处理的CF与PS的配比,分析CF含量对制件强度及精度的影响;最后结合扫描电子显微镜(SEM)观察烧结件断面内部结构并进行分析.结果表明,经气相沉积处理的CF含量为10％时复合材料的弯曲强度较高,达10.17 MPa,比纯PS制件提高约76.3％.微观形貌SEM显示,随着CF含量的增加,孔隙量增加,从而导致SLS烧结件的强度降低.