摘要
针对聚酰胺11(PA11)粉末在选择性激光烧结(SLS)过程中,高温老化的粉末熔体流动性能显著降低,导致性能恶化,无法直接循环利用的问题,提出一种有效的老化粉末回收方法。研究了新粉和旧粉的性能差异,采用新粉和老化粉(旧粉)共混技术,讨论不同新旧粉比对相对分子质量、粉末熔体流动性、粉末热性能的影响,明晰旧粉的添加量对烧结制件的力学性能、尺寸精度和表面质量的影响。结果表明,添加50%旧粉的混合粉末能实现粉末熔体流动性的大幅度提高,比纯旧粉的熔体流动性提升了298%;烧结制件拉伸强度和断裂伸长率分别达到纯新粉的98%和91%,尺寸精度控制在±0.1 mm以内;制件表面质量好,无橘皮,无明显侧纹。通过PA11新旧粉共混技术可以实现PA11旧粉在生产体系中的回收利用,提高原料利用率,降低成本。
In view of the problem that the melt flow performance of polyamide 11(PA11)powder significantly decreases during the selective laser sintering(SLS)due to high-temperature aging,resulting in the deteriorated performance and inability to be directly recycled,an effective method for recycling aged powder was proposed.The performance differences between new and old powders were studied.The blending technology of new powder and aged powder(old powder)was adopted to discuss the influence of different ratios of new powder to old powder on the relative molecular weight,the melt fluidity and thermal properties of the powders,and to clarify the influence of the addition amount of old powder on the mechanical properties,dimensional accuracy and surface quality of sintered parts.The results show that the mixed powder with 50%old powder achieves a substantial increase in the powder melt fluidity,which is 298%higher than that of pure old powder.The tensile strength and elongation at break of the sintered parts respectively reach 98%and 91%of those of pure new powder,and the dimensional accuracy is controlled within±0.1 mm.The surface quality of the parts is good,without the orange peel and obvious lateral lines.The blending technology of old and new PA11 powders could achieve the recycling and utilization of old PA11 powder in the production system,improving the utilization rate of raw materials and reducing costs.
作者
金叶
高唯
孙茂银
吴健
JIN Ye;GAO Wei;SUN Maoyin;WU Jian(Guizhou Institute of Metallurgy and Chemical Industry,Guiyang 550014,China)
出处
《塑料工业》
北大核心
2025年第5期147-152,160,共7页
China Plastics Industry
基金
黔科合服企〔2022〕006
黔科院J字〔2024〕4号
筑科合同〔2023〕8-3号
黔科合支撑〔2023〕一般350
黔科冶化字KF〔2023〕02号
黔科院J字〔2024〕2号。
