Abstract No.:
6334

 Title:
Nickel-CNT composite film deposited from Ni-P coated CNT by low-pressure cold spray process

 Authors:
Jongbeom Choi / Tokyo Institute of Technology, Japan
Wataru Nakayama / Tokyo Institute of Technology, Japan
Nana Okimura/ Tokyo Institute of Technology, Japan
Takuya Hotchi/ Tokyo Institute of Technology, Japan
Yuki Hirata/ Tokyo Institute of Technology, Japan
Naoto Ohtake/ Tokyo Institute of Technology, Japan
Hiroki Akasaka/ Tokyo Institute of Technology, Japan

 Abstract:

Carbon nanotubes (CNTs) have attracted from a lot of fields due to its extraordinary mechanical, electrical, thermal and low friction properties. Thus, CNT containing composite materials have been studied. On the other hand, it is hard to deposit these composite using a thermal spray process because of decomposition of CNTs by their high temperature. A cold spray is well known for its low-temperature process compared with other thermal spray process. The cold spray process uses accelerated gas with supersonic speed in order to collide and deposit particles. A localized plastic deformation occurs on the interface between particles and substrate. For a decade, researches on CNTs reinforced metal matrix composite (MMC) were conducted to acquire CNTs-MMC film. According to the some reports, it was possible to acquire the homogeneously dispersed CNT-Cu composite film. Nevertheless, structural defects on CNTs were observed by Raman spectroscopy, these may be during the ball milling process adding defects into CNTs through mechanically alloying process. Hence, new CNTs-MMC synthesis method is demanded. In this research, Ni-P coated CNTs by electroless plating and pure Ni mixture powder was applied to low-pressure cold spray process. The Ni-P coated CNTs was obtained by electroless Ni-P plating process for 1 h, and 1 g of CNTs was covered with 4 g of Ni-P. This powder mixed with 15 g of pure Ni powder (mean diameter 4 micron), and mixed powder contained 5 wt.% CNTs. Nickel-CNT composite film was deposited. On sand blasted Al substrate from Ni-P coated CNTs by low-pressure cold spray process. The elemental distribution mapping by EDX for composite film showed homogeneously distributed phosphorus and carbon on the Al substrate. The G and D peaks in Raman spectra between powder and film were observed without a significant change of Raman shift.



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