3:30 PM - 3:45 PM
△ [15p-A25-10] Carbon nanotube reinforced polyethlene composite fabricated by cold spray
Keywords:Carbon nanotube, Composite, Cold spraying
Carbon nanotubes (CNTs) application in various composite materials owes to its outstanding physical, chemical and electrical properties as filler. CNT filler brings drastic change in mechanical and electro-conductive properties in the base materials. In this research, we adopted a cold spray processing technique to prepare a polymer composite film on Al substrate, where poly-ethylene (PE) powder and CNT mixture is used as source material. The target of the research is quick and easy deposition of PE/CNT composite films which has minimized oxidative stress and corrosion. The thermal and electric conductivities of the PE/CNT composite film was examined and the effect of CNT filler was discussed.
The base PE beads powder was purchased from Senshin Enterprise Co., Ltd, its mean particle size was 20 mm in diameter. The CNT used as filler was multi-walled CNT “VGCF-H” from Showa Denko. CNT mixing ratio in source material was 7.2 wt. %. Cold splay apparatus DYMET 423 from OCPS was used for composite film deposition. Splay gas pressure was set at 0.40 MPa, feeding rate was 1.6 g/min, gas temperature was controlled at 240 ℃, and distance between nozzle and substrate was kept at 12 mm. The width of PE/CNT composite film obtained by cold spray deposition for 10 sec. was 15 mm × 75 mm, and the mean thickness of the film was 15 mm. Then the composite film obtained was examined by a laser Raman spectroscopy, where the laser intensity was fixed at 3.1 mW and an excitation wavelength was 532 nm. The Raman scattering peaks observed on the composite film were attributed to PE and CNT, suggesting both PE and CNT were integrated in the composite films without any mechanical damage during the course of cold spray operation. Based on the Raman spectra, the PE/CNT composite film formation by cold spray processing was confirmed. The increased electrical conductivity compare with PE film was also confirmed by conduction tester. That was further evidence of the incorporation of CNT in PE film. In conclusion, PE/CNT composite film formation on Al substrate was successfully achieved by adopting the cold spray processing.
The base PE beads powder was purchased from Senshin Enterprise Co., Ltd, its mean particle size was 20 mm in diameter. The CNT used as filler was multi-walled CNT “VGCF-H” from Showa Denko. CNT mixing ratio in source material was 7.2 wt. %. Cold splay apparatus DYMET 423 from OCPS was used for composite film deposition. Splay gas pressure was set at 0.40 MPa, feeding rate was 1.6 g/min, gas temperature was controlled at 240 ℃, and distance between nozzle and substrate was kept at 12 mm. The width of PE/CNT composite film obtained by cold spray deposition for 10 sec. was 15 mm × 75 mm, and the mean thickness of the film was 15 mm. Then the composite film obtained was examined by a laser Raman spectroscopy, where the laser intensity was fixed at 3.1 mW and an excitation wavelength was 532 nm. The Raman scattering peaks observed on the composite film were attributed to PE and CNT, suggesting both PE and CNT were integrated in the composite films without any mechanical damage during the course of cold spray operation. Based on the Raman spectra, the PE/CNT composite film formation by cold spray processing was confirmed. The increased electrical conductivity compare with PE film was also confirmed by conduction tester. That was further evidence of the incorporation of CNT in PE film. In conclusion, PE/CNT composite film formation on Al substrate was successfully achieved by adopting the cold spray processing.