[1]唐明晨,陈鹏,傅华,等.激光选区烧结尼龙12的老化及微观结构演变[J].中国材料进展,2019,(11):1053-1061.[doi:10.7502/j.issn.1674-3962.201904009]
 TANG Mingchen,CHEN Peng,FU Hua,et al.Aging and Microstructure Evolution of Polyamide-12 during Selective Laser Sintering[J].MATERIALS CHINA,2019,(11):1053-1061.[doi:10.7502/j.issn.1674-3962.201904009]
点击复制

激光选区烧结尼龙12的老化及微观结构演变()
分享到:

中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2019年第11期
页码:
1053-1061
栏目:
出版日期:
2019-11-30

文章信息/Info

Title:
Aging and Microstructure Evolution of Polyamide-12 during Selective Laser Sintering
文章编号:
16743962(2019)11105308
作者:
唐明晨1陈鹏1傅华1詹军2佘勇2闫春泽1
(1华中科技大学材料科学与工程学院 材料成形及模具技术国家重点实验室,湖北 武汉 430074)(2湖北三环智能科技有限公司,湖北 武汉 430074)
Author(s):
TANG Mingchen1 CHEN Peng1 FU Hua1 ZHAN Jun2 SHE Yong2 YAN Chunze1
(1State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China) (2Hubei Sanhuan Intelligent Technology Co., Ltd., Wuhan 430074, China)
关键词:
增材制造激光选区烧结尼龙12老化微观结构演变
Keywords:
additive manufacturing selective laser sintering PA12 aging microstructure evolution
分类号:
TQ342+1;TG665
DOI:
10.7502/j.issn.1674-3962.201904009
文献标志码:
A
摘要:
材料的老化是影响激光选区烧结(SLS)制件性能与精度的重要因素,其本质原因与材料内部的微观结构变化有重要关系。因此,着重探讨尼龙12(PA12)的老化机制及经过不同次SLS工艺处理后的粉末及其对应制件的晶体结构、元素化学状态及性能变化。结果表明,老化的PA12粉末的XRD图谱呈现类似Brill转变的峰值合并现象,由此导致了老化粉末熔点的提高,且经过3次重复利用的粉末的烧结窗口扩大至3100 ℃。X射线光电子能谱分析证实了固态和熔态缩聚反应的存在,其使得老化粉末具有较高的成核温度。差示扫描量热实验的结果表明,采用PA12老化粉末制备的制件出现了结晶延迟现象,而且随着PA粉末老化程度的增加,固态缩聚使其结晶度不断降低。
Abstract:
Materials aging is an important factor influencing the properties and surface accuracy of components fabricated by selective laser sintering (SLS) technology, the underlying cause is the microstructure changes of materials. Therefore, this work emphatically studied the mechanism of polyamide-12 (PA12) aging, and the changes of crystal structure, chemical states of elements and properties of the aged powders and the corresponded components after SLS process. The results show that the XRD patterns of the aged powders appear the peaks like Brill transition, resulting in the improvement of melting temperature of the aged powder. Moreover, the sintering window of the PA12 powder recycled for three times is expanded to 3100 ℃. Xray photoelectron spectroscopy spectra demonstrates the presence of solid and melt state polycondensation, which results in higher nucleation temperatures of aged powders. Meanwhile, the crystallization delay phenomenon of components fabricated with aged powders is observed by differential scanning calorimetry. With the increase of aging level of PA12 powder, its crystallinity is generally reduced by solid state polycondensation.

备注/Memo

备注/Memo:
收稿日期:20190404修回日期:20190524 基金项目:湖北省科技创新重大专项(2017AAA109,2016AAA109);广东创新创业团队项目(2013C071);武汉市国际科技合作计划项目(2017030209020252)第一作者:唐明晨,男,1994年生,硕士研究生通讯作者:闫春泽,男,1975年生,教授,博士生导师, Email: c_yan@hust.edu.cn
更新日期/Last Update: 2019-10-30