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林产化学与工业 ›› 2021, Vol. 41 ›› Issue (2): 17-23.doi: 10.3969/j.issn.0253-2417.2021.02.003

• 重点研发专栏 • 上一篇    下一篇

选择性激光烧结杨木/热塑性聚氨酯的成型性能研究

张慧, 刘大坤, 郭艳玲, 李健()   

  1. 东北林业大学 机电工程学院, 黑龙江 哈尔滨 150040
  • 收稿日期:2020-10-06 出版日期:2021-04-28 发布日期:2021-05-08
  • 通讯作者: 李健 E-mail:lijian499@163.com
  • 作者简介:李健, 副教授, 博士生导师, 研究领域为增材制造技术和生物仿生技术; E-mail: lijian499@163.com
    张慧(1990-), 女, 辽宁大连人, 博士生, 主要从事选择性激光烧结技术研究工作
  • 基金资助:
    国家重点研发计划资助项目(2017YFD0601004);国家自然科学基金项目资助(51905084)

Forming Properties of Boxwood/Thermoplastic Polyurethane Fabricated by Selective Laser Sintering

Hui ZHANG, Dakun LIU, Yanling GUO, Jian LI()   

  1. College of Mechanical and Electronic Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2020-10-06 Online:2021-04-28 Published:2021-05-08
  • Contact: Jian LI E-mail:lijian499@163.com

摘要:

提出一种新型的可用于选择性激光烧结(SLS)技术的低成本柔性木塑耗材。以黄杨木废料作原料,采用机械共混方式制备了杨木粉质量分数分别为2%、5%、10%和15%的杨木/热塑性聚氨酯混粉(B/TPU),对不同杨木粉质量分数的混粉及其激光烧结制件的热性能、力学性能、尺寸精度和微观形貌进行了测量与表征,以部分因子试验探讨了工艺参数对激光烧结制件成型性能的影响。研究结果表明:当预热温度为48℃,激光功率14 W,扫描速率1 600 mm/s,扫描间距0.1 mm,分层厚度0.1 mm时,木粉质量分数为10%的B/TPU激光烧结制件的力学性能最佳,拉伸强度4.86 MPa,弯曲强度9.19 MPa,断裂伸长率24.22%。

关键词: 木塑混粉, 选择性激光烧结, 部分因子试验设计方法, 工艺参数优化, 力学性能

Abstract:

A new type of wood-plastic mixtures that were used for selective laser sintering(SLS) was proposed with the advantages of low cost and good flexibility. Boxwood/thermoplastic polyurenthane(B/TPU) mixtures containing with the boxwood powder mass fraction of 2%, 5%, 10%, and 15% were prepared by mechanical mixing method, respectively. The thermal properties, mechanical properties, dimensional accuracy and microstructures of the mixtures and laser-sintered parts were tested and characterized. The effects of material ratio and process parameter on formability of laser sintering were investigated. Fractional factorial design method was applied to study the effects of process parameters on the forming properties of the laser-sintered parts. The results showed that laser-sintered boxwood/thermoplastic part with 10% boxwood powder had the best mechanical property when the preheating temperature was 48 ℃, laser power was 14 W, scan speed was 1 600 mm/s, scan spacing was 0.1 mm and layer thickness was 0.1 mm. The properties were summarized as that the tensile strength reached 4.86 MPa, the flexural strength was 9.19 MPa and the elongation at break reached 24.22%.

Key words: wood-plastic mixtures, selective laser sintering, fractional factorial design method, process parameter optimization, mechanical property

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