Synthesis of carbon nanotube reinforced aluminum composite powder (CNT-Al) by polymer pyrolysis chemical vapor deposition (PP-CVD) coupled high energy ball milling (HEBM) process

Carbon nanotube reinforced Aluminum (CNTAl) composite powder was prepared by polymer pyrochemical chemical vapor deposition (PP-CVD) at different temperatures with polyethylene glycol (PEG) as carbon source, cobalt nitrate as catalyst precursor and fine Al powder as starting material. The morphologi...

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Published in:Diamond and related materials Vol. 104; p. 107748
Main Authors: Zhang, Yingpeng, Wang, Qun, Ramachandran, Chidambaram Seshadri
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01.04.2020
Elsevier BV
Subjects:
Aluminum
Aluminum composites
Ball milling
Carbon
Carbon nanotubes
Chemical vapor deposition
Cold spraying
Gravimetric analysis
High energy ball milling
Interface reactions
Metal matrix composite
Metallurgical analysis
Morphology
Particulates
Phase composition
Polyethylene glycol
Polymer pyrolysis
Powder metallurgy
Powder spraying
Pyrolysis
Raman spectroscopy
Carbon nanotubes
Polymer pyrolysis
High energy ball milling
Aluminum
Metal matrix composite
Chemical vapor deposition
ISSN:0925-9635, 1879-0062
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Summary:Carbon nanotube reinforced Aluminum (CNTAl) composite powder was prepared by polymer pyrochemical chemical vapor deposition (PP-CVD) at different temperatures with polyethylene glycol (PEG) as carbon source, cobalt nitrate as catalyst precursor and fine Al powder as starting material. The morphologies, structure, phase composition, and elemental content of the synthesized CNT-Al composite powders were investigated using scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA). The optimized CNT-Al was agglomerated with pure fine Al powder by a high energy ball milling (HEBM) method to obtain several kinds of CNT-Al composite powder with different content of CNTs. The results show that the CNTs in CNT-Al composite powder synthesized at 600 °C showed the highest crystallinity with a reinforcement content of 7 wt%. Although the HEBM process partly smashed the structure of CNTs, it increased the interfacial reaction between CNTs and Al particles. The resulting agglomeration helped to merge the small particulates to form larger particles, thus increasing the overall flowability of the composite powder. Therefore, the PP-CVD coupled HEBM procedure can be employed as an innovative process to prepare the CNT-Al composite powder with uniformly distributed CNTs. The powder manufactured in this investigation has excellent potential to be used in powder metallurgy, cold spraying of CNT-Al composite coatings, and additive manufacturing of composite free-forms. [Display omitted] •A novel preparation process of carbon nanotubes/aluminum composite powder•Temperature optimization for the favorable growth of carbon nanotubes•The lubrication effect of carbon nanotubes in the ball milling process•The evolution of carbon nanotubes structure during ball milling
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ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2020.107748