中国塑料 ›› 2021, Vol. 35 ›› Issue (10): 31-36.DOI: 10.19491/j.issn.1001-9278.2021.10.006

• 材料与性能 • 上一篇    下一篇

用于选择性激光烧结成型的聚酰胺6/硫酸钙复合粉体的制备及性能研究

杨秀琴, 刘意鹤, 苗世成, 朱登昶, 于翔()   

  1. 河南工程学院材料工程学院,郑州 450007
  • 收稿日期:2021-03-31 出版日期:2021-10-26 发布日期:2021-10-27
  • 基金资助:
    河南省高等学校重点科研项目(21A430008)

Preparation and Performance Investigation of PA6/CaSO4 Composite Powders for Selective Laser Sintering Molding

YANG Xiuqin, LIU Yihe, MIAO Shicheng, ZHU Dengchang, YU Xiang()   

  1. College of Materials Engineering,Henan University of Engineering,Zhengzhou 450007,China
  • Received:2021-03-31 Online:2021-10-26 Published:2021-10-27
  • Contact: YU Xiang E-mail:yxpolymer@sina.com

摘要:

采用溶液沉淀法制备了聚酰胺6/硫酸钙(PA6/CaSO4)复合粉体,通过扫描电子显微镜(SEM)、差示扫描量热仪(DSC)、激光粒度分布仪和X射线衍射仪(XRD)对复合粉体的微观形貌、热性能、粒度分布、晶体结构和流动性进行了表征。结果表明,随着CaSO4的加入,PA6/CaSO4复合粉体由松散的球形结构转变为密实的球形结构;CaSO4的加入能够提高PA6/CaSO4复合粉体的结晶度并拓宽其烧结温度窗口,在CaSO4含量为5 %(质量分数,下同)时,结晶度和烧结温度窗口均达到最大值,分别为61.84 %和18.95 ℃;PA6/CaSO4复合粉体的粒径随CaSO4含量的增加呈现先减后增的趋势,休止角先减后增,堆积密度先增后减;当CaSO4含量为3 %~5 %时,PA6/CaSO4复合粉体的流动性能最佳,最适用于选择性激光烧结。

关键词: 聚酰胺6, 硫酸钙, 复合粉体, 选择性激光烧结

Abstract:

In this study, PA6/CaSO4 composite powders were prepared using a solvent precipitation method. Their microstructure, thermal properties, particle size distribution, crystal structure, and flowability were investigated by SEM, DSC, XRD and laser particle size?distribution analysis. The results indicated that the PA6/CaSO4 composite powders transformed from a loose spherical structure to the dense spherical one with the addition of CaSO4. The introduction of CaSO4 increased the degree of crystallinity (Xc) of the composite powders and broadened their sintering temperature window. When the CaSO4 content was 5 wt%, the Xc reached maximum value of 61.84 % and the sintering temperature window reached a maximum value of 18.95 °C. Moreover, the particle size and repose angle of the composite powders decreased at first and then tended to increase with an increase in the CaSO4 content. However, their bulk density showed an increasing trend at first and then tended to decrease. The composite powders exhibited optimal flow performance at the CaSO4 content ranging from 3 to 5 wt%, which was most suitable for selective laser sintering.

Key words: polyamide 6, calcium sulfate, composite powder, selective laser sintering

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