材料科学
纳米复合材料
三元运算
复合材料
电介质
选择性激光烧结
碳纳米管
复合数
渗流阈值
压电
烧结
陶瓷
渗透(认知心理学)
电阻率和电导率
光电子学
电气工程
程序设计语言
神经科学
工程类
生物
计算机科学
作者
Fangwei Qi,Ning Chen,Qi Wang
标识
DOI:10.1016/j.matdes.2018.01.050
摘要
Polyamide11 (PA11)/BaTiO3/carbon nanotube (CNT) ternary nanocomposites (PBCNCs-3D) with 3D segregated percolation routes were fabricated by selective laser sintering (SLS) of CNT-coated PA11/BaTiO3 nanocomposite powder. The CNT-coated PA11/BaTiO3 nanocomposite powder show a higher laser absorption and wider sintering window than those of conventional PA11/BaTiO3/CNT ternary nanocomposite powders with a structure where CNTs are randomly distributed throughout the powder particles, endowing the composite powders with better sinterability. The 3D segregated conductive pathway was efficiently constructed in the PBCNCs-3D parts with a low percolation threshold of 0.3 wt%. The PBCNCs-3D parts showed a higher dielectric constant of 16.2 at a frequency of 1 kHz, which is approximately twice higher than that of SLS-printed composite parts (PBCNCs) without a segregated structure. Compared with PBCNCs, the piezoelectric strain coefficient increased from 1.7 to 2.1 pC/N. These results not only provide a new material for SLS processing but lay the groundwork to enhance the performance of piezoelectric polymer composites by constructing 3D segregated percolation routes.
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