Electrostatic spray deposition (ESD) of polymeric powders on thermoplastic (PA66) substrate

Barletta, Massimiliano; Gisario, Annamaria; Tagliaferri, V.

doi:10.1016/j.surfcoat.2005.11.120

Cited by 34 publications

(20 citation statements)

References 13 publications

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“…Nevertheless, in employing progressively smaller abrasive size, the average size of splinters embedded in the surface decreased, and consequently, the result has a more aesthetically pleasing appearance. Similar results were found in previous studies of fluidized bed machining, which found widespread embedding phenomena of harder abrasive splinters in the softer substrates are recurrent phenomena (alumina splinters in aluminium and brass substrates [32,33], copper splinters in polyamide 6 and 66 substrates [34]). Fig.…”

Section: Analysis Of Surface Morphologysupporting

confidence: 91%

Progress in fluidized bed assisted abrasive jet machining (FB-AJM): Internal polishing of aluminium tubes

Barletta

Guarino

Rubino

et al. 2007

International Journal of Machine Tools and Manufacture

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This paper deals with the internal finishing of tubular components made from a high strength aluminium alloy (AA 6082 T6) using a fluidized bed assisted abrasive jet machining (FB-AJM) system.Firstly, a Taguchi's experimental plan was used to investigate the influence of abrasive jet speed, machining cycle, and abrasive mesh size on surface roughness and material removal trends. Secondly, the leading finishing mechanisms were studied using combined 3d profilometer-SEM analysis to monitor the evolution of the surface morphology of machined workpieces. Finally, the circumferential uniformity and precision machining of the inner surface of workpieces were tested by evaluating the values of the more significant roughness parameters in different circumferential locations.Consistent trends of surface roughness vs. operational parameters were measured, and significant material removal was found to affect the workpieces during machining. As a result, FB-AJM was found to preferentially machine the asperities and irregularities of the surface, thereby altering the overall surface morphology producing more regular and smoother finishing. Moreover, the good circumferential uniformity and machining accuracy FB-AJM guarantees even on ductile aluminium alloy workpieces ensure that this technology can be applied to a diverse set of industrial components. r

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Section: Analysis Of Surface Morphologysupporting

confidence: 91%

Progress in fluidized bed assisted abrasive jet machining (FB-AJM): Internal polishing of aluminium tubes

Barletta

Guarino

Rubino

et al. 2007

International Journal of Machine Tools and Manufacture

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“…W literaturze światowej można znaleźć informacje o udanym natryskiwaniu powłok metalowych na tworzywa, m.in. cyny na PC/ABS, polipropylen, polistyren i poliamid-6 [4]; miedzi na PA66 [5], a także aluminium na PEEK450CA30 [6]. Uzyskane powłoki były gęste o małej porowatości.…”

Section: Stan Zagadnieniaunclassified

“…Przy zastosowaniu ciśnienia 3 mPa bez podgrzania i tym samym podwyższeniu prędkości czą-steczek obserwowano głównie erozję substratu [4]. W pracy [5] odnotowano jednak, że po uzyskaniu pierwszej szczelnej powłoki miedzi nie następuje dalsze osadzanie, co jest spowodowane zmianą rodzaju podłoża na metalowe a tym samym potrzebę zastosowania wyższych prędkości. W przypadku cyny udało się uzyskać szczelną powłokę o grubości 45÷100 μm przy zastosowaniu azotu o ciśnieniu 3 mPa bez podgrzania i przy obliczonej prędkości cząsteczek 310 m/s.…”

Section: Stan Zagadnieniaunclassified

Analiza numeryczna mechanizmu wiązania proszku cyny z powierzchnią tworzywa sztucznego w procesie natryskiwania na zimno

Małachowska

Winnicki

Ambroziak

2015

Przegląd Spawalnictwa

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Analiza numeryczna mechanizmu wiązania proszku cyny z powierzchnią tworzywa sztucznego w procesie natryskiwania na zimno numerical simulation of tin powder spraying onto aBs substrate plastic in the cold spray method Mgr inż. aleksandra Małachowska, mgr inż. Marcin Winnicki, dr hab. inż. andrzej ambroziak, prof. PWr -Politechnika Wrocławska. StreszczenieW procesie nanoszenia powłok metodą Cold Spray cząsteczki są przyspieszane do dużych prędkości za pomocą rozgrzanego i sprężonego gazu, a po uderzeniu w podłoże osadzają się wskutek deformacji plastycznej. Ze względu na niską temperaturę występującą w tej metodzie wydaje się ona odpowiednia do metalizacji tworzyw sztucznych. W artykule zawarto analizę literaturową z zakresu metalizacji tworzyw sztucznych. Przedstawiono wyniki symulacji numerycznej mES nanoszenia proszku cyny na podłoże z tworzywa ABS. Analizie zostały poddane pola temperatury podczas procesu nanoszenia. Otrzymane wyniki zweryfikowano w oparciu o zdjęcia z mikroskopu skaningowego. abstractIn Cold Spray process particles are accelerated to high speed by heated and compressed gas, and after impact deposited on the substrate as a result of plastic deformation. Due to the low temperatures during the process the Cold Spray method seems to be appropriate to the metallization of plastics. The article includes analysis of the literature of plastics metallization. The results of numerical simulation of tin powder spraying onto ABS substrate plastic are presented. The temperature fields during the spraying process are analyzed. The obtained results are verified on the basis of scanning microscope images.Wstęp metoda natryskiwania na zimno (Cold Spray) wynaleziona w latach 80 ub.w. w Rosji należy do najnowszej generacji metod natryskiwania cieplnego. Istota jej działania opiera się na przyspieszeniu nanoszonego proszku w strumieniu sprężonego i podgrzanego gazu do prędkości naddźwiękowych przy zastosowaniu zbieżno-rozbieżnej dyszy de Lavala. W zależności od stosowanego ciśnienia gazu wyróżnia się dwie odmiany natryskiwania na zimno: nisko-i wysokociśnieniową.W przypadku metody niskociśnieniowej gazem roboczym jest najczęściej powietrze o ciśnieniu do 1 mPa, a nagrzewnica umieszczona jest w palniku. Proszek wprowadzany jest radialnie tuż za przewężeniem (rys. 1). Fig. 1. Scheme of Low Presure Cold Spray method [1] Rys. 1. Schemat metody niskociśnieniowego natryskiwania na zimno [1]

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“…Microfluidic devices were fabricated by MIT own built hot-embossing setup using uncoated and coated micromold (Barletta et al 2006). Hot-embossing process is described elsewhere (Saha et al 2010a, b).…”

Section: Characterizationmentioning

confidence: 99%

Effect of sputtering power on friction coefficient and surface energy of co-sputtered titanium and molybdenum disulfide coatings and its performance in micro hot-embossing

et al. 2013

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Si micromolds are common for fabrication of polymer-based microfluidic devices by hot-embossing because of the well established fabrication methods for Si, e.g., deep reactive ion etching, for favorable surface finish and accuracy. The problems with low yield, poor reproducibility, premature failure and limited lifetime of a Si micromold are induced by high friction and surface adhesion generated during demolding. Therefore, Titanium (Ti) and molybdenum disulfide (MoS 2 ) coatings were deposited on Si micromolds via magnetron co-sputtering at various combinations of target powers to improve its surface properties. Coating composition, crystallographic orientation, roughness, critical load, hardness, friction coefficient and surface energy were measured by X-ray photoelectron spectroscopy, X-ray diffraction, atomic force microscopy, scratch testing, nanoindentation, ball-on-disc tribometry and the contact angle method respectively. A statistical design of experiment matrix was used to investigate the effect of the Ti and MoS 2 target powers on the friction coefficient and surface energy of the coatings. From this designed experiment, it was observed that increasing MoS 2 target power was associated with increasing surface energy and decreasing friction coefficient and target powers had statistically significant effects on these parameters. Crystallinity, roughness and hardness of the coatings increased with increasing Ti concentration. A mathematical model of the effects of Ti and MoS 2 target powers on the friction coefficient and surface energy of the coatings has been fit to the experimental results using the response surface method. Uncoated and MoS 2 -Ti coated Si micromolds were used in hot-embossing for a comparative study on replication performance of uncoated and various coated micromolds. Hotembossed PMMA microstructures showed that coating improve replication performance of Si micromolds. Si micromold coated with co-sputter of Ti and MoS 2 at power of 300 and 75 W respectively, showed better replication quality among the selected target powers.

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Electrostatic spray deposition (ESD) of polymeric powders on thermoplastic (PA66) substrate

Cited by 34 publications

References 13 publications

Progress in fluidized bed assisted abrasive jet machining (FB-AJM): Internal polishing of aluminium tubes

Progress in fluidized bed assisted abrasive jet machining (FB-AJM): Internal polishing of aluminium tubes

Analiza numeryczna mechanizmu wiązania proszku cyny z powierzchnią tworzywa sztucznego w procesie natryskiwania na zimno

Effect of sputtering power on friction coefficient and surface energy of co-sputtered titanium and molybdenum disulfide coatings and its performance in micro hot-embossing

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