Thermal effects in blasting and erosion of polymeric materials

Shipway, P.H.; Weston, David

doi:10.1016/j.jmatprotec.2009.03.006

Cited by 13 publications

(7 citation statements)

References 29 publications

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“…On the contrary, they appear to be consistent with mechanical properties above melting temperature. This observation suggests that thermal effects may arise locally during the impact generated by the collapse of a cavitation bubble or the dissipation of the impact energy into heat [11].…”

Section: Discussionmentioning

confidence: 99%

“…Other studies on the erosion by solid particles also suggest the local increase of the temperature and the dissipation of the impact energy into heat. This was observed in the case of polymers but not in the case of metals [11,12]. Moreover, it is worthy to notice that it is extremely difficult to determine the local and instantaneous temperature.…”

Section: Introductionmentioning

confidence: 92%

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Outstanding cavitation erosion resistance of Ultra High Molecular Weight Polyethylene (UHMWPE) coatings

Deplancke

Lame

Cavaillé

et al. 2015

Wear

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International audienceThe resistance to cavitation erosion of Ultra High Molecular Weight Polyethylene (UHMWPE) coatings with two molecular weight 0.6 and 10.5 Mg/mol was tested in a hydrodynamic tunnel during 98 h at a flow velocity of about 90 m/s. This polymer is known to have an excellent wear resistance. These materials were processed by sintering on a metallic substrate textured by electron beam melting to ensure mechanical interlocking. UHMWPE with molecular weight 10.5 Mg/mol has an exceptional resistance to cavitation erosion superior to that of stainless steel A2205 whereas UHMWPE with molecular weight 0.6 Mg/mol has a resistance to cavitation erosion similar to that of a conventional Nickel Aluminum Bronze alloy (in term of erosion depth). Two possible explanations are put forward for the good cavitation resistance of UHMWPE with highest molecular weight: the tensile test in semi-crystalline state shows no strain localization and, above melting temperature, the disentanglement of UHMWPE with molecular weight 10.5 Mg/mol is very slow unlike the UHMWPE with molecular weight 0.6 Mg/mol which tends to flow

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Outstanding cavitation erosion resistance of Ultra High Molecular Weight Polyethylene (UHMWPE) coatings

Deplancke

Lame

Cavaillé

et al. 2015

Wear

View full text Add to dashboard Cite

show abstract

“…4.3) between the abrasive nozzle tip and the target was held constant at 20 mm, perpendicular to the target in all cases. The chosen pressure and standoff distance are consistent with typical AJM conditions used by a number of investigators [26,[82][83][84][85], and have been optimized for a number of factors. For example, measurements have shown that use of a shorter standoff distance results in a lower particle velocity, since the particles are still accelerating up to 20 mm from the nozzle [86].…”

Section: Methodsmentioning

confidence: 99%

Abrasive Jet Micro-Machining of Polymeric Materials

Hailu¹

2023

Preprint

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In the abrasive jet micro-machining (AJM) process, a jet of small particles is directed through an erosion resistant mask opening so that micro-sized features (i.e., micro-channels, holes, etc.) can be machined for the fabrication of micro-devices such as micro-fluidic and micro-electro-mechanical-systems (MEMS). Polymeric materials and elastomers have found applications in a wide variety of micro-devices. This thesis investigates the AJM of such materials, addressing the major challenges that must be overcome in order for the process to gain wider acceptance in industry. The thesis first presents a novel cryogenically assisted abrasive jet micro-machining (CAJM) technique that enables the micro-machining of elastomers such as polydimethylsiloxane (PDMS) that cannot be machined at room temperature. It was found that the erosion rate during CAJM is greatly increased, and the degree of particle embedment greatly decreased, compared to room temperature experiments. A finite element (FE) analysis was used to investigate the relationships between erosion, the heat transfer of the cooling jet and the resulting target temperature during the CAJM of channels in PDMS. The analysis illustrated the asymmetric nature of the cooling with much more cooling occurring towards the trailing edge of the jet. It was found that the predicted shape of the evolving machined surface profiles was improved significantly when a FE model was used to account for thermal distortion occurring during the CAJM process. An unwanted consequence of the AJM of polymeric materials was found to be particle embedding. Criteria leading to the embedding of spherical and angular particles in such materials were identified and modelled using rigid plastic analyses. It was found that the likelihood of embedding was proportional to the static coefficient of friction between the particle and the target for angular particles, and the depth of penetration for spherical particles. Scanning electron microscopy with EDX was used to measure the area coverage of embedded Al2O3 particles in polymers and elastomers, in order to evaluate various cleaning methods that were developed. It was found that glass bead blasting at 45˚ followed by the freezing technique was the best method to remove embedded particles, leading to 100% removal in some cases.

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“…Shipway and Hutchings [28] found motivation for their study based on the fact that erosion rates have appeared different under seemingly similar gas blast erosion tests. The authors found that the gas plume was unaffected by the nozzle internal roughness whereas the particle plumes were.…”

Section: Jet Divergencementioning

confidence: 99%

Cryogenic Abrasive Jet Machining of Polydimethylsiloxane and Polytetrafluoroethylene at Different Temperatures

Gradeen¹

2021

Preprint

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The temperature dependence of the solid particle erosion of polydimethylsiloxane (PDMS), polytetrafluoroethylene (PTFE) and high carbon steel using aluminum oxide particles was investigated. The most efficient machining of PDMS occurred at approximately -178°C, at angles of attack between 30° and 60°. Although it was demonstrated that PDMS could be machined at temperatures above its glass transition, the erosion rate increased by a factor of more than 10 when the machining temperature was below this point. The maximum erosion in PTFE occurred at the coldest temperature of -177°C between the angles of 30 and 90°. This scenario improved the erosion rate by more than a factor of five. The erosion rate in high carbon steel was increased approximately twofold when lowering the temperature from 17°C to -177°C. The surface evolution results presented can be used to predict feature shapes both polymers while minimizing cooling costs, minimizing mask wear or maximizing substrate erosion.

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Thermal effects in blasting and erosion of polymeric materials

Cited by 13 publications

References 29 publications

Outstanding cavitation erosion resistance of Ultra High Molecular Weight Polyethylene (UHMWPE) coatings

Outstanding cavitation erosion resistance of Ultra High Molecular Weight Polyethylene (UHMWPE) coatings

Abrasive Jet Micro-Machining of Polymeric Materials

Cryogenic Abrasive Jet Machining of Polydimethylsiloxane and Polytetrafluoroethylene at Different Temperatures

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