Effect of carbon nanotube amount on polyethylene welding process induced by laser source

Visco, Annamaria; Campo, N.; Torrisi, L.; Caridi, F.

doi:10.1007/s00339-011-6361-9

Cited by 31 publications

(22 citation statements)

References 12 publications

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“…Such targets were prepared using thermal sintering processes consisting in immersing the CNT and UHWPE micrometric powders in ethanol at 78 C for 2 h, in magnetic mixing the solution at 60 C for 2 h, and finally, in the viscous solution transfer in a suitable teflon polytetrafluoroethylene (PTFE) mold where the polymer is subjected to a pressure of 20 MPa at 200 C for 15 min, as described in the literature. 14 The cooling, at room temperature, is controlled and completed at 30 min. The final foils have a uniform thickness of 50 lm, a surface area of about 28 cm 2 , an average density of 0.95 g/cm 3 , and a color depending on the CNT concentration, from white-gray (very low CNT concentration) to black (1% weight concentration).…”

Section: Methodsmentioning

confidence: 99%

TNSA and ponderomotive plasma production in enriched carbon polyethylene foils

2017

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Proton and carbon ion acceleration in a target-normal-sheath-acceleration regime produced by a laser intensity of 10 16 W/cm 2 was investigated using thin polyethylene foils. Measurements performed at the PALS facility in Prague demonstrate forward ion acceleration above 1 MeV per charge state. The ion acceleration is higher in thinner polymeric foils. In order to increase the emission yield of the proton and carbon ions, the target thickness should be enhanced, but this choice reduces drastically the ion acceleration. The use of highly absorbing stuff, such as carbon nanotubes embedded inside a polymer, enhances the ion acceleration but results in a broad ion energy distribution and a low amount of the highly accelerated ion species. Published by AIP Publishing. [http://dx.

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Section: Methodsmentioning

confidence: 99%

TNSA and ponderomotive plasma production in enriched carbon polyethylene foils

2017

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“…It is clearly seen that the absorption coefficient increases considerably with increasing the content of CB. The range (up to ~3000 cm −1 ) of α values is higher than the reported one (usually <500 cm −1 ) for polymer welding (requiring less energy than glass sealing) probably due to the higher laser power and the higher content of CB used here …”

Section: Resultsmentioning

confidence: 53%

Effective Laser Sealing Enabled by Glass Thick Films Containing Carbon Black/Carbon Nanotubes

et al. 2013

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An effective way of providing complete sealing of glass using an 810 nm diode laser was investigated for longer lifetime of glass panel‐based devices. Small amounts (<5 wt%) of laser‐absorbing materials such as carbon black (CB) or carbon nanotubes (CNT) were added to a bismuth zinc borate glass paste for instantaneous adhesion between glass substrates without interfacial cracks or severe pores. A higher laser power was required for a lower content of carbon for the laser‐assisted sealing of glass. As optimal compositions, the addition of 1.0 wt% CB or 0.5 wt% CNT led to complete densification of glass with higher optical transmittance. Higher absorption coefficients calculated in the CNT case, e.g., ~536.4 cm−1 for the 0.5 wt% CNT sample compared to ~277.6 cm−1 for the 0.5 wt% CB sample, are believed to be responsible for the effective sealing even with a lower content of CNT.

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“…However, the hump, porosity, incomplete fusion, collapse and dripping welding defects often exist in the dissimilar materials laser welding when unsuitable process parameters are adopted. The quality of welded joints is evaluated according to the weld seam geometry, microstructures and mechanical properties [3,4]. It is observed that the welding process parameters, such as the laser power (LP), welding speed (WS), focal position (FP), gap (GAP) and shielding gas (GS), have great influence on the weld seam geometry and hence the quality of welded joints.…”

Section: Introductionmentioning

confidence: 99%

Process modeling and parameter optimization using radial basis function neural network and genetic algorithm for laser welding of dissimilar materials

Shao

Jiang

et al. 2015

Appl. Phys. A

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The welded joints of dissimilar materials have been widely used in automotive, ship and space industries. The joint quality is often evaluated by weld seam geometry, microstructures and mechanical properties. To obtain the desired weld seam geometry and improve the quality of welded joints, this paper proposes a process modeling and parameter optimization method to obtain the weld seam with minimum width and desired depth of penetration for laser butt welding of dissimilar materials. During the process, Taguchi experiments are conducted on the laser welding of the low carbon steel (Q235) and stainless steel (SUS301L-HT). The experimental results are used to develop the radial basis function neural network model, and the process parameters are optimized by genetic algorithm. The proposed method is validated by a confirmation experiment. Simultaneously, the microstructures and mechanical properties of the weld seam generated from optimal process parameters are further studied by optical microscopy and tensile strength test. Compared with the unoptimized weld seam, the welding defects are eliminated in the optimized weld seam and the mechanical properties are improved. The results show that the proposed method is effective and reliable for improving the quality of welded joints in practical production.

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Effect of carbon nanotube amount on polyethylene welding process induced by laser source

Cited by 31 publications

References 12 publications

TNSA and ponderomotive plasma production in enriched carbon polyethylene foils

TNSA and ponderomotive plasma production in enriched carbon polyethylene foils

Effective Laser Sealing Enabled by Glass Thick Films Containing Carbon Black/Carbon Nanotubes

Process modeling and parameter optimization using radial basis function neural network and genetic algorithm for laser welding of dissimilar materials

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