Selective laser sintering (SLS) is an additive manufacturing process which nowadays receives abundant attention from industry sectors. However, the number of materials which can be processed by SLS is still very limited and requires further research. The present work aims to contribute to this topic by investigating the mechanical properties of neat and short carbon fibre reinforced polyamide 1212 processed by SLS. The specimens were built in different spatial alignments to obtain ample details on the tensile behaviour. The detailed examinations of the fractured specimens were performed by means of optical microscopy, scanning electron microscopy and X-ray computed tomography. The comprehensive analysis revealed that most of the fibres (85 – 95%) were oriented in the plane of the powder layer and here, the majority along the direction of the moving roller coater, which distributes the powder on the powder bed of the SLS machine. It was shown that this effect has a direct impact on the strength and stiffness of the printed tensile bars and thus on the mechanical behaviour of SLS printed parts. Furthermore, the analysis results indicate the possibility to control this mechanical anisotropy through a systematic alignment of the components in the powder cake.

选择性激光烧结（SLS）是一种增材制造工艺，如今已受到工业界的广泛关注。但是，SLS可以处理的材料数量仍然非常有限，需要进一步研究。本工作旨在通过研究SLS处理的纯净和短碳纤维增强聚酰胺1212的机械性能，为这一主题做出贡献。样品以不同的空间排列方式构建，以获得有关拉伸行为的大量细节。借助于光学显微镜，扫描电子显微镜和X射线计算机断层摄影术对断裂的标本进行详细检查。综合分析表明，大多数纤维（85 – 95％）在粉末层的平面内取向，在这里，大部分沿着移动式辊涂机的方向，将粉末分布在SLS机器的粉末床上。结果表明，这种影响对印刷的拉伸杆的强度和刚度有直接影响，从而对SLS印刷零件的机械性能也有直接影响。此外，分析结果表明可以通过粉饼中各组分的系统排列来控制这种机械各向异性。