Laser sintering of separated and uniformly distributed multiwall carbon nanotubes integrated iron nanocomposites
Laser sintering of separated and uniformly distributed multiwall carbon nanotubes integrated iron nanocomposites
复制标题
激光烧结分离且均匀分布的多壁碳纳米管集成铁纳米复合材料
DOI：
10.1063/1.4869214
复制
发表时间：
2014
影响因子：
3.2
通讯作者：
G. Cheng
中科院分区：
文献类型：
--
作者：
D. Lin;C. Liu;G. Cheng
在纳米复合材料的增材制造过程中，碳纳米管（CNT）在金属基体中的均匀分布一直是一个挑战，因为CNT倾向于在熔池中聚集。采用激光烧结法将多壁碳纳米管（MWNTs）分离并均匀分布在铁基体中。将MWNTs和铁粉通过磁力搅拌混合，涂覆在4140钢表面，然后进行激光烧结。由于快速的加热和冷却速率，CNT均匀地分布在金属基体中。温度场的计算采用多物理场模拟，考虑了尺寸效应，包括尺寸相关的熔化温度，导热系数和热容。利用SEM、TEM和XRD等分析手段研究了激光烧结碳纳米管复合材料的过程。实验结果证明了该方法制备多壁碳纳米管金属基复合材料的可行性。
Uniform distribution of carbon nanotubes (CNTs) in metal matrix during additive manufacturing of nanocomposites is always a challenge since the CNTs tend to aggregate in the molten pool. In this study, Multiwall carbon nanotubes (MWNTs) were separated and distributed uniformly into iron matrix by laser sintering process. MWNTs and iron powders were mixed together by magnetic stir, coated on steel 4140 surface, followed by laser sintering. Due to the fast heating and cooling rate, the CNTs are evenly distributed in the metal matrix. The temperature field was calculated by multiphysics simulation considering size effects, including size dependent melting temperature, thermal conductivity, and heat capacity. The SEM, TEM, and XRD were used to understand the laser sintering of CNT integrated nanocomposites. The results proved the feasibility of this technique to synthesize MWNTS integrated metal matrix nanocomposites.