Bibliografie tematiche / Powder

Letteratura scientifica selezionata sul tema "Powder"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Powder"

1

Lange, Gerrie. "Vortex Target: A New Design for a Powder-in-Gas Target for Large-Scale Radionuclide Production". Instruments 3, n. 2 (3 aprile 2019): 24. http://dx.doi.org/10.3390/instruments3020024.

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This paper presents a design and working principle for a combined powder-in-gas target. The excellent surface-to-volume ratio of micrometer-sized powder particles injected into a forced carrier-gas-driven environment provides optimal beam power-induced heat relief. Finely dispersed powders can be controlled by a combined pump-driven inward-spiraling gas flow and a fan structure in the center. Known proton-induced nuclear reactions on isotopically enriched materials such as 68Zn and 100Mo were taken into account to be conceptually remodeled as a powder-in-gas target assembly, which was compared to thick target designs. The small irradiation chambers that were modeled in our studies for powdery ‘thick’ targets with a mass thickness (g/cm2) comparable to 68Zn and 100Mo resulted in the need to load 2.5 and 12.6 grams of the isotopically enriched target material, respectively, into a convective 7-bar pressured helium cooling circuit for irradiation, with ion currents and entrance energies of 0.8 (13 MeV) and 2 mA (20 MeV), respectively. Current densities of ~2 μA/mm2 (20 MeV), induces power loads of up to 4 kW/cm2. Moreover, the design work showed that this powder-in-gas target concept could potentially be applied to other radionuclide production routes that involve powdery starting materials. Although the modeling work showed good convective heat relief expectations for micrometer-sized powder, more detailed mathematical investigation on the powder-in-gas target restrictions, electrostatic behavior, and erosion effects during irradiation are required for developing a real prototype assembly.
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2

Field, A. C., L. N. Carter, N. J. E. Adkins, M. M. Attallah, M. J. Gorley e M. Strangwood. "The Effect of Powder Characteristics on Build Quality of High-Purity Tungsten Produced via Laser Powder Bed Fusion (LPBF)". Metallurgical and Materials Transactions A 51, n. 3 (1 gennaio 2020): 1367–78. http://dx.doi.org/10.1007/s11661-019-05601-6.

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AbstractTwo high-purity tungsten powders, produced via different manufacturing techniques, were characterized to determine size distribution, morphology, thermal properties, and flow characteristics and, thus, the likely suitability for Laser Powder Bed Fusion (LPBF) production. Specimens from duplicate builds were produced with the two powders and characterized for density, defect mechanisms, and thermal penetration into the substrate plate to compare apparent power densities. The first powder was a chemically reduced powder with irregular morphology and the second, a plasma spheroidized powder with highly spherical morphology. The latter was found to have tighter morphological control and size distribution, having a third of particles at the modal particle size in comparison to a fifth of the chemically reduced powder. This led to better flow characteristics, and an increase of 1.5 g cm−3 (1500 kg m−3) in the packing densities seen in the powder bed which corresponds to 57 pct theoretical density vs 50 pct theoretical density in the chemically reduced powder. As a result, the specimens produced from the plasma spheroidized powder had higher densities (97.3 vs 88.5 pct) and the dominant defect mechanism moved from lack of fusion dominated in the chemically reduced powder to cracking dominated in the plasma spheroidized. The plasma spheroidized powder also showed higher apparent power densities (effective absorptivities) as evidenced by an 80 pct deeper penetration of the laser into the substrate plate.
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3

Govender, Preyin, Deborah Clare Blaine e Natasha Sacks. "INFLUENCE OF POWDER CHARACTERISTICS ON THE SPREADABILITY OF PRE-ALLOYED TUNGSTEN- CARBIDE COBALT". South African Journal of Industrial Engineering 32, n. 3 (2021): 284–89. http://dx.doi.org/10.7166/32-3-2664.

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With rising interest in additive manufacturing (AM) techniques, there is an increased focus on research that evaluates critical parameters that guide the selection of powders that are suitable for AM. One such parameter is a powder’s spreadability, described by metrics such as powder bed density and percentage coverage. This study focused on three spray-dried WC-Co powders (two 12 wt% and one 17 wt% Co) and evaluated the influence of typical powder characteristics, such as particle size and shape, apparent density, and flow rate, on their spreadability. It was found that particle size distribution influenced the powder spreadability. Larger particles hindered the even spreading of powder over the base plate, resulting in low powder bed density and percentage coverage. This also correlated with the powders’ apparent densities. The flow rate and angle of repose gave an indication of how cohesive the powders are. The more cohesive a powder, the poorer the spreadability, resulting in a lower powder bed density and percentage coverage.
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4

Lu, Yingying, Kai Ma, Changchao Guo, Ming Jiang, Chengfeng Wu, Shipeng Li e Shaoqing Hu. "Experimental Studies on Thermal Oxidation and Laser Ignition Properties of Al-Mg-Li Powders". Materials 16, n. 21 (28 ottobre 2023): 6931. http://dx.doi.org/10.3390/ma16216931.

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Powder ramjets are a kind of vehicle propulsion system with high specific impulse and efficiency. They provide significant benefits in terms of extended propulsion and thrust adjustment. The pursuit of a highly reactive fuel appropriate for powder ramjets is likely to stimulate advancements in innovative propulsion systems, which are crucial for deep space exploration and long-term space missions. This work presents experimental studies on the thermal oxidation and laser ignition performance of aluminum–magnesium–lithium powders at atmospheric pressure. TG-DSC curves of powders in three heating rates were obtained. The ignition processes and ignition delay times were recorded by a CO2 laser ignition experiment system at a laser power of 10~60 W. The results show that at a lower heating rate of 10 K/min, the powder’s thermal hysteresis is less, and the powder energy released in stage I is more concentrated. However, the degree of heat release concentration approached a similar level at heating rates of 30 K and 50 K. The ignition delay time decreased as the laser flux density increased. When the laser flux density exceeds 80 W/cm2, the effect of laser power on the ignition delay time decreases. At atmospheric pressure, the mathematical relationship between ignition delay time and laser flux density is given. Finally, the powder ignition processes at different laser powers are represented graphically.
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5

Çalışkan Koç, Gülşah, e Ayşe Nur Yüksel. "THE FOAM-MAT CONVECTIVE AND MICROWAVE DRIED AVOCADO POWDER: PHYSICAL, FUNCTIONAL, AND POWDER PROPERTIES". Latin American Applied Research - An international journal 50, n. 4 (25 settembre 2020): 291–97. http://dx.doi.org/10.52292/j.laar.2020.486.

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The aim of this study was to produce hot air (60-80°C and 20% ventilation rate) and microwave (120-700W) assisted foam mat dried avocado powders and to determine the effect of different drying temperatures and microwave powers on physical, functional, and powder properties of avocado powders. Significantly lower drying times were observed for the microwave assisted foam-mat dried avocado powder (p<0.05). Microwave assisted foam-mat dried avocado powders have superior properties in moisture content and flow properties (p<0.05), whereas comparatively better results were obtained for hot air assisted foam mat dried avocado powder for wettability and solubility times. The changes in ash content, pH, water holding capacity, bulk and tapped densities, Carr Index and Hausner Ratio values followed a quadratic trend depending on both drying temperature and microwave power. Principal component analysis indicated that there is a convenient relation between the avocado powders which were dried at different drying techniques and conditions.
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6

Zhou, Feng, Ying Qing Fu e Yang Gao. "Properties of Al2O3-TiO2 Coating Prepared by Plasma Spraying with an Internally-Fed Powder System". Key Engineering Materials 368-372 (febbraio 2008): 1274–76. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1274.

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Alumina-titania (60: 40 by weight) coatings were prepared by low power plasma thermal spraying with two types of plasma spray systems: internally-fed and externally-fed powder system. The coatings were investigated by many techniques, respectively X-ray diffraction (XRD), scanning electron microscopy (SEM) and micro-hardness tester. It was found that the thickness of coatings by low power plasma spray with an internally-fed powder system is higher than that of the coatings with an externally-fed powder system. The internally-fed powder system not only decreases the loss of powder but also increases the deposition efficiency for more than 80%. To better qualify the characteristics of these coatings prepared from spray-dried powders, microhardness was also studied.
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7

Nakamura, Takahiro, Hajime Horikawa, Masahiro Asahara, Xing Zheng Wu e Takashi Ogihara. "Dye-Sensitized Solar Cell Fabrication with Hydrothermal Synthesized TiO2 and Evaluation the Power Generation Efficiency". Key Engineering Materials 388 (settembre 2008): 293–96. http://dx.doi.org/10.4028/www.scientific.net/kem.388.293.

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TiO2 powder was synthesized hydrothermally from titanium alkoxide ethanol solution in supercritical state and obtained anatase type crystalline powder sized ca. 20 nm. Dye-sensitized solar cells were fabricated with the powders and evaluated the power generation efficiencies.
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8

Sehhat, M. Hossein, Austin T. Sutton, Chia-Hung Hung, Ben Brown, Ronald J. O’Malley, Jonghyun Park e Ming C. Leu. "Plasma spheroidization of gas-atomized 304L stainless steel powder for laser powder bed fusion process". Materials Science in Additive Manufacturing 1, n. 1 (18 marzo 2022): 1. http://dx.doi.org/10.18063/msam.v1i1.1.

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Particles of AISI 304L stainless steel powder were spheroidized by the induction plasma spheroidization process (TekSphero-15 spheroidization system) to assess the effects of the spheroidization process on powder and part properties. The morphology of both as-received and spheroidized powders was characterized by measuring particle size and shape distribution. The chemistry of powders was studied using inductively coupled plasma optical emission spectroscopy for evaluation of composing elements, and the powder’s microstructure was assessed by X-ray diffraction for phase identification and by electron backscattered diffraction patterns for crystallography characterization. The Revolution Powder Analyzer was used to quantify powder flowability. The mechanical properties of parts fabricated with as-received and spheroidized powders using laser powder bed fusion process were measured and compared. Our experimental results showed that the fabricated parts with plasma spheroidized powder have lower tensile strength but higher ductility. Considerable changes in powder chemistry and microstructure were observed due to the change in solidification mode after the spheroidization process. The spheroidized powder solidified in the austenite-to-ferrite solidification mode due to the loss of carbon, nitrogen, and oxygen. In contrast, the as-received powder solidified in the ferrite-to-austenite solidification mode. This change in solidification mode impacted the components made with spheroidized powder to have lower tensile strength but higher ductility.
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9

Gorji, N. E., R. O’Connor e D. Brabazon. "XPS, SEM, AFM, and Nano-Indentation characterization for powder recycling within additive manufacturing process". IOP Conference Series: Materials Science and Engineering 1182, n. 1 (1 ottobre 2021): 012025. http://dx.doi.org/10.1088/1757-899x/1182/1/012025.

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Abstract Powder recycling and reducing the waste metallic powder is EU’s key provision in waste framework directive (2008/98/EC). The aim of this investigation is to analyse the correlation between the surface and morphology properties of (virgin and recycled) powders and the microstructure and mechanical properties of the 3D printed parts (made of three powders). Two biomedical Tibia implants have been 3D printed from virgin and 3-5 times recycled powders of stainless steel 316L. For this, the surface composition and microstructure of the powders has been characterized and correlated to the nanoindentation measurements carrier out on these implants. X-ray surface spectroscopy (XPS) has been used to analyse the oxidation level on the powder’s surface revealing less than 10% more oxygen on the surface of recycled powders. SEM analysis shows less than 5 μm difference in powder size distribution even though the shape and circularity of the recycled powders seem to be affected under several reusing cycles. The size of the powder particles does not show much difference but satellites and binding between the powders increased in recycled powder. The hardness and effective modulus of the parts from recycled powders are significantly smaller than the virgin-made implants, which could be due to higher porosity present in the recycled powder or due to oxygen increment on recycled powder. The surface roughness (AFM analysis) has slightly increased on part made of recycled powders. However, the overall morphology shows little difference between the two parts.
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10

Ozerskoi, Nikolai, Alexey Silin, Nikolay Razumov e Anatoly Popovich. "Optimization of EI961 steel spheroidization process for subsequent use in additive manufacturing: Effect of plasma treatment on the properties of EI961 powder". REVIEWS ON ADVANCED MATERIALS SCIENCE 60, n. 1 (1 gennaio 2021): 936–45. http://dx.doi.org/10.1515/rams-2021-0078.

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Abstract For use in additive manufacturing (AM), powders that have a spherical shape, high fluidity, and packing density are required. One of the methods for producing spherical powders is spheroidization using inductively coupled plasma. In this work, the powder of steel grade EI961 was used. To obtain the powder for subsequent use in 3D printing, the selection of modes was carried out with the change in various parameters of the unit: different power, powder feed rate to the plasma as well as the height of feed rate. The optimal spheroidization mode is as follows: power of 15 kW, pressure of 1 atm, feed rate height of 0 mm, and powder feed rate of 28 g·min−1. The temperature distribution over the plasma torch cross section was calculated and the maximum plasma temperature was also determined. In addition, the effect of plasma treatment on the granulometric composition, phase composition, and chemical composition was studied.
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Più fonti

Tesi sul tema "Powder"

1

Dhavale, Tushar. "Low power laser sintering of iron powder". Thesis, University of the West of England, Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522529.

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Hari, Vignesh. "Evaluating spreadability of metallic powders for powder bed fusion processes". Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-283544.

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Additive  manufacturing  technologies  are  widely  used  in  aerospace,  space,  and  turbine industries. Parts can be manufactured directly by selectively adding materials layer-by-layer. A key aspect that is critical to the quality of the final component being manufactured is the powder characteristics. The prevailing powder characterisation techniques help in predicting the flowability of powders but do not relate to the spreading nature of the powder. To create high-quality thin layers of metal powder, it is essential to understand powder spreadability in powder bed-based additive manufacturing processes. The objective of this study was to create spreadability metrics using image analysis, mass analysis, and density analysis. A lab-scale experimental setup was constructed to replicate the powder bed-based additive manufacturing process. The impact of spreading speed and layer thickness on five different steel powders were studied using the suggested metrics. The metrics obtained powder rheometry and revolution powder analysis. The flowability parameters were compared to the spreadability analysis. Image analysis was shown to be efficient to predict the spreading nature of the powder when the processing parameters are varied. One metric, the convex hull ratio, was found to be high for  free-flowing  powders.  The  spread  area  of  free-flowing  powders  was  higher  than  the powders with poor flow properties. A mass-based analysis procedure shows that the ratio of mass deposited to the theoretical mass fluctuated in a systematic manner as a function of testing parameters  and  for  different  powders,  suggesting  that  the  mass  analysis  might  be  another potential   metric   to   assess   spreadability.   The   density-based   analysis   was   effective   in differentiating the layer density of different powders under various experimental conditions. It   is   expected   that   the   proposed   metrics   will   be   a   beginning   for  developing   further characterisation techniques. For example, the layer thickness could be studied by creating a homogenous  layer.  We  anticipate  these  metrics  to  be  used  to  develop  standardisation techniques for defining and quantifying powder spreadability, and thereby improve quality ofadditive manufacturing processes.
Additiv  tillverkning  är  teknologier  som  har  stor  uträckning  inom  flyg-,  rymd  och  turbin industrier. Delar kan bli tillverkade direkt genom att lagervis addera material på varandra. En nyckelaspekt som är kritisk till kvalitén av den slutgiltiga komponenten är egenskaperna hos pulvret. De allmänna teknikerna för pulverkarakterisering hjälper till att förutspå flytförmågan hos pulver men relaterar ej till dess spridningsförmåga. För att kunna skapa högkvalitativa skikt av  metallpulver  är  det  nödvändigt  att  förstå  pulvrets  spridningsförmåga  inom  pulverbädds baserade additiva tillverkningsprocesser. Målet  med denna studie var  att skapa ett mått för spridningsförmågan  genom  bild-  och  massanalys.  Ett  experimentellt  upplägg  i  labbskala konstruerades för att efterlikna en pulverbädds baserad additiv tillverkningsprocess. Effekten av bladets hastighet och lagrets tjocklek på fem olika pulver studerades genom användandet av de  föreslagna  mätetalen.  De  framtagna  mätetalen  jämfördes  sedan  med  existerande  pulver karakteriseringsmetoder  såsom  FT-4  Rheometer  och  pulver  analys  med  hjälp  av  roterande trumma. Slutligen så jämförs flytbarhets parametrarna med spridbarhets mätetalen. Det visar sig att bildanalysen är tillräckligt bra på att förutspå spridningsförmågan hos pulvret när  processparametrarna  låtes  vara  varierande.  Mer  specifikt  så  var  förhållandet  mellan pulvrets yta och det konvexa höljet stort för pulver som visar bra spridning. De framtagna procent  värden  från  massanalysdiagrammen  fluktuerar  vid  olika  processparametrar  hos  de olika  pulvren,  vilket  kan  betyda  att  massanalys  kan  vara  ett  potentiellt  sätt  för  att  mätta spridningsförmågan hos pulver. Det är förväntat att dessa föreslagna mätetal kommer vara början för utveckling av ytterligare karakteriseringstekniker. Till exempel, för att studera densiteten och tjockleken hos ett lager skulle man kunna skapa homogena lager. Vi förutser att dessa mätetal kommer att bli använda för att skapa standardiseringstekniker för att definiera och kvantifiera spridningsförmågan hos ett pulver och genom detta förbättra kvaliteten av den additiva tillverkningsprocessen.
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Cordts, Eike [Verfasser]. "Advanced Powder Characterization Techniques for Inhalation Powder Mixtures / Eike Cordts". Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/1064175279/34.

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4

Bennett, Fiona. "Electrostatic charge phenomena in powder processes for dry powder inhalers". Thesis, University of Sunderland, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365417.

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5

Cihangir, Salih. "Powder pulse plating". Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/40974.

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Electroplating is a common method of obtaining metallic coatings on a surface. Generally, the metal salt is introduced into solution and a direct current is applied to the material that is to be coated. In this thesis, an alternative approach is investigated, namely the metal is introduced onto the metal surface as a powder and a pulsed current is applied to firstly dissolve some of the powder and the polarity is reversed so that the metal is then deposited. This fuses the powder to itself and to the substrate. In the current study, deep eutectic solvents were used as the electrolytes and two metals were chosen; zinc and copper. Initially the dissolution and deposition of the pure metals were investigated. It was found that far from being simple dissolution and deposition processes insoluble films were formed on the electrode surface during both deposition and dissolution for zinc and during dissolution for copper. Powder pulse plating was successfully demonstrated if the current pulse characteristics were kept within a window of size and duration which avoided these insoluble films. It was found that large metallic particles could be used when the substrate was held in a horizontal orientation and small particles were best when the electrode was held vertically. For both metals it was demonstrated that super-efficient deposition could be obtained (Faradaic current efficiency in the cathodic pulse > 100%). It was also shown that composite materials could be produced by mixing inert particles with the metallic powder.
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Nishantha, Hewamarappulige Indunil. "Powder Diffraction Methods". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222116031.

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Brisenmark, Lucas, e Simon Lindström. "Image based analysis on powder spreadability in powder bed additive manufacturing". Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277895.

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Additive manufacturing is an increasingly popular industry that has gained significant traction in the last decade. Today there exists no way to predict how a powder will spread in a powder bed additive manufacturing machine or how well it will form into thin layers. This is important because major costs can be saved by using a test that predicts the spreading behaviour of powder. This ability to be spread will be given the name spreadability. To test the spreadability of powder, a machine that mimicked the pushing of the powder in powder bed additive manufacturing was used. Since there exist no metric for spreadability, the study decided to attempt to quantify the spreadability with the help of image analysis. In the image analysis the area of the powders was measured, and through a comparison of the area against a bounding geometry, a measurement for spreadability can theoretically be attained. To further validate the results and simultaneously search for possible correlations, the experimental data was compared against flowability data obtained from angle of repose and Hall flowmeter. The results showed that the method of choice worked well for measuring the area and gave data that could be used to interpret spreadability. The data also showed what seems to be a correlation with the flowability data. While no definitive conclusions could bedrawn due to a small sample size, the collected data does seem promising for future work.
Additiv tillverkning är en alltmer populär industri som har fått stor uppmärksamhet under det senaste decenniet. Idag så finns det inga sätt som man kan förutse hur ett pulver kommer att bredas ut i en pulverbädds additiv tillverkningsmaskin eller hur bra den är på att bilda tunna lager. Detta är en viktig kunskap att förstå då stora kostnader kan sparas in genom att använda ett test som förutser utbredningsförmågan av pulver. Denna förmåga får namnet spridbarhet. För att kunna testa spridbarheten hos pulver, används en maskin som härmar puttandet av pulver i en pulverbädds additiv tillverkningsmaskin. Eftersom det inte finns någon metod att mäta spridbarhet med, så valde denna studie att försöka kvantifiera spridbarheten via en bildanalys. Med denna bildanalys kunde arean av pulver mätas och genom att jämföra denna mot en avgränsande geometri kan mätdata för spridbarheten teoretiskt fås fram.För att kunna validera resultatet, och samtidigt se om det finns en korrelation, jämfördes det med flytbarhetsdata från rasvinkelmätare och Hall flödesmätare. Resultaten visade att metoden klarade av att mäta arean, och gav resultat som kan användas för att tolka spridbarhet. Den data som framtogs visade också att det möjligtvis kan finnas en korrelation mellan spridbarhet och flytbarhet. Även om något klart svar inte kan ges på grund av en liten provstorlek, så verkar resultaten vara lovande för framtida arbeten.
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Hanson, S. M. J. "Powder co-injection moulding". Thesis, Cranfield University, 2000. http://dspace.lib.cranfield.ac.uk/handle/1826/3681.

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A novel powder processing technique has been developed by combining conventional powder injection moulding with polymer co-injection moulding, to permit the in-situ surface engineering of metal or ceramic components as an integral step within the processing cycle. The new technique has been used to produce surface engineered iron based components with either corrosion resistant or wear resistant surfaces, and to produce alumina based components with toughened surfaces. The most critical factor for the feasibility of surface engineered components is that the sintering profiles of the skin and core materials must be well matched or differential shrinkage or delamination will result. A particular requirement of surface engineering is the ability to control the surface engineered skin profile. Polymer injection moulding modelling software was applied to predict the surface engineered skin profiles of the surface engineered metal/ceramic components. Successful skin profile prediction is dependent on the characterisation of the feedstock materials being injection moulded. Several feedstocks have been characterised for their material properties and first pass models developed to predict the feedstock material properties as a function of their individual material properties and mass or volume ratios. It has been demonstrated that the design of the feedstock composition and injection moulding process conditions can be optimised by the use of computer-based injection moulding modelling software to achieve the desired surface engineered skin profile. A methodology has been developed that outlines all the stages necessary for successful powder co-injection moulding.
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Rathbone, T. "Aerated flow of powder". Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373688.

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Yap, Siaw Fung. "Micromechanics and powder compaction". Thesis, University of Birmingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489036.

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Più fonti

Libri sul tema "Powder"

1

1935-, Gotoh Keishi, Masuda Hiroaki 1943- e Higashitani Kō 1944-, a cura di. Powder technology handbook. 2a ed. New York: Marcel Dekker, 1997.

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2

Kneale, Matthew. Powder. London: Picador, 2005.

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3

Swift, Thomas Kevin. Powder metallurgy. Norwalk, CT: Business Communications Co., 1994.

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4

Thomas, Karyn L. Powder metallurgy. Norwalk, CT: Business Communications Co., 1991.

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1943-, Masuda Hiroaki, Higashitani Kō 1944- e Yoshida Hideto 1952-, a cura di. Powder technology handbook. 3a ed. Boca Raton: CRC/Taylor & Francis, 2006.

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6

1943-, Masuda Hiroaki, Higashitani Kō 1944- e Yoshida Hideto 1952-, a cura di. Powder technology: Fundamentals of particles, powder beds, and particle generation. Boca Raton: CRC Press/Taylor & Francis, 2007.

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7

Dinnebier, R. E., e S. J. L. Billinge, a cura di. Powder Diffraction. Cambridge: Royal Society of Chemistry, 2008. http://dx.doi.org/10.1039/9781847558237.

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8

Jilek, Josef H. Powder coatings. Blue Bell, PA (492 Norristown Rd., Blue Bell): Federation of Societies for Coatings Technology, 1991.

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9

Hassanpour, Ali, Colin Hare e Massih Pasha, a cura di. Powder Flow. Cambridge: Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788016100.

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10

Jenkins, S. S. Powder punches. Cleveland, OH: International Society of Explosives Engineers, 2003.

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Capitoli di libri sul tema "Powder"

1

Bährle-Rapp, Marina. "powder". In Springer Lexikon Kosmetik und Körperpflege, 447. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_8390.

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Chow, Y. S., Virendra K. Gupta, Sue W. Nicolson, Harley P. Brown, Vincent H. Resh, David M. Rosenberg, Edward S. Ross et al. "Wettable Powder". In Encyclopedia of Entomology, 4219. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_2654.

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Bährle-Rapp, Marina. "compact powder". In Springer Lexikon Kosmetik und Körperpflege, 126. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_2360.

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Bährle-Rapp, Marina. "Conchiorin Powder". In Springer Lexikon Kosmetik und Körperpflege, 127. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_2377.

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5

Serov, Mikhail Mikhailovich. "Powder Metallurgy". In Structural Properties of Porous Materials and Powders Used in Different Fields of Science and Technology, 83–101. London: Springer London, 2014. http://dx.doi.org/10.1007/978-1-4471-6377-0_4.

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6

German, Randall M. "Powder Selection". In Particulate Composites, 177–223. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29917-4_6.

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7

Herrera Ramirez, Jose Martin, Raul Perez Bustamante, Cesar Augusto Isaza Merino e Ana Maria Arizmendi Morquecho. "Powder Metallurgy". In Unconventional Techniques for the Production of Light Alloys and Composites, 33–48. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48122-3_3.

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8

Kearsley, Malcolm W., e Ronald C. Deis. "Maltitol Powder". In Sweeteners and Sugar Alternatives in Food Technology, 295–308. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781118373941.ch13.

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Wilson, David, Ron Roberts e John Blyth. "POWDER COMPACTION". In Chemical Engineering in the Pharmaceutical Industry, 203–25. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2019. http://dx.doi.org/10.1002/9781119600800.ch59.

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Courard, Luc, Duncan Herfort e Yury Villagrán. "Limestone Powder". In RILEM State-of-the-Art Reports, 123–51. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70606-1_4.

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Atti di convegni sul tema "Powder"

1

Breen, Joe, Andrew Buffmire, Jonathon Duerig, Kevin Dutt, Eric Eide, Mike Hibler, David Johnson et al. "POWDER". In MobiCom '20: The 26th Annual International Conference on Mobile Computing and Networking. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3411276.3412204.

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Li, Xuxiao, e Wenda Tan. "Numerical Modeling of Powder Gas Interaction for Laser Powder Bed Fusion Process". In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8302.

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Abstract (sommario):
Abstract The powder motion induced by the gas flow has been identified as one of the critical phenomena in laser powder bed fusion processes that significantly affects the build quality. However, the gas dynamics and its induced driving forces for the powder motions have not been well quantified. A numerical model is developed to investigate such powder-gas interactions. With a combination of computational fluid dynamics and particle tracking techniques, the model is capable of simulating the transient gas flow field surrounding the powder and the forces exerted on powder surfaces. The interaction between metal powders and a free jet is investigated with the current model. In the simulation results, the entrainment and the ejection motions of powders with respect to the free jet can be predicted. It is found that the driving forces of these motions are majorly contributed by the pressure differences in the gas flow surrounding the powder, and the powders can also interact with the jet to significantly alter the flow field. Quantities which are difficult to measure by experiments are quantified by the simulations, such as the velocity and pressure field in the gas, as well as the subjected forces and torques of powders. Such quantitative information provides insights to the mechanisms of the powder-gas interaction in laser powder bed fusion processes.
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Hecht, Christoph, Mario Sprenger e Jörg Franke. "Laser powder bed fusion of titanium alloyed copper powder for power electronic substrates". In 2024 47th International Spring Seminar on Electronics Technology (ISSE). IEEE, 2024. http://dx.doi.org/10.1109/isse61612.2024.10603471.

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4

Gao, Y., D.-M. Yang e Z. J. Yan. "Investigation of Plasma Spraying with Internal Axial Powder Injection". In ITSC2009, a cura di B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima e G. Montavon. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.itsc2009p0768.

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Abstract Plasma spraying with axial powder injection inside the anode nozzle is a method considered to markedly enhance deposition efficiency and reduce plasma power compared to the most general method of injecting powder at the nozzle exit. However, powder injecting inside the nozzle will also likely cause problems from powder deposition on the nozzle wall and clogging of the particle feed channels. In this study, spherical stainless steel 316 and angular alumina powders with a mean size of 20-40 μm are used to deposit coatings via axial powder injection. The effect of powder feed rate, gas flow rate, and plasma power on deposition efficiency and particle clogging are investigated. The results show that particle clogging can be avoided by reducing powder feed rate and increasing the velocity of the plasma jet.
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Sajbura, Adam, e Pawel Sokolowski. "Ultrasonic Atomization as a Novel Route for the Metal Powder Development". In ITSC 2023. ASM International, 2023. http://dx.doi.org/10.31399/asm.cp.itsc2023p0735.

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Abstract The widespread use of additive manufacturing and modern powder-based technologies (thermal spraying, hardfacing, sintering) encourages the search for alternative routes enhancing the development of metal and metal alloy powders. The state-of-the-art powder production processes, like gas, water or plasma atomization, are dedicated to mass production, which limits the availability of new powder compositions with desired characteristics. In this study, stainless steel powders were investigated. The powders were atomized by an in-house developed ultrasonic (UT) atomization set-up, called ULTRAMIZER. In this system, the atomization of melt is possible by using a high-power ultrasonic field. The atomized powders were characterized in terms of morphology and particle size distribution (PSD). The powder features were then correlated with operating parameters of: (i) UT atomization system, mainly frequency and root mean square power (RMS), and (ii) the orientation of the atomization plate against the melting system, by means of distance and tilting angle. The study shows that the ultrasonic atomization allows producing nearly spherical, defect-free powder particles, with a very narrow and controllable size distribution. These are important advantages over other metal powder production methods, especially when it comes to the development of new types of powder.
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Nakanishi, Yoshihito, Seiichiro Matsumura e Chuichi Arakawa. "Powder box". In VRIC '14: Virtual Reality International Conference - Laval Virtual 2014. New York, NY, USA: ACM, 2014. http://dx.doi.org/10.1145/2617841.2620724.

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Noguchi, Jun, Koichiro Kimura, Masayoshi Ohuchi, Hiromi Shimizu, Takafumi Aoki, Jiro Baba, Shoichi Hasegawa e Makoto Sato. "Powder screen". In ACM SIGGRAPH 2006 Emerging technologies. New York, New York, USA: ACM Press, 2006. http://dx.doi.org/10.1145/1179133.1179161.

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Søgaard, Søren, Mette Bryder, Morten Allesø e Jukka Rantanen. "Characterization of powder properties using a powder rheometer". In The 2nd Electronic Conference on Pharmaceutical Sciences. Basel, Switzerland: MDPI, 2012. http://dx.doi.org/10.3390/ecps2012-00825.

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Karastoyanov, D., T. Penchev e V. Monov. "Production of Parts from Metal Powder – Powder Characteristics". In 2023 9th International Conference on Control, Decision and Information Technologies (CoDIT). IEEE, 2023. http://dx.doi.org/10.1109/codit58514.2023.10284161.

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Li, Huikai, Erin Brodie, Sebastian Thomas e Christopher Hutchinson. "Laser Powder Bed Fusion of Mixed Powders". In International Conference of Asian Society for Precision Engineering and Nanotechnology. Singapore: Research Publishing Services, 2022. http://dx.doi.org/10.3850/978-981-18-6021-8_or-01-0228.html.

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Rapporti di organizzazioni sul tema "Powder"

1

Lange, Fred F. Mechanics of Powder Plastic Powder Compacts. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2001. http://dx.doi.org/10.21236/ada392070.

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Das, Aniruddha. Powder Spreading Testbed for Studying the Powder Spreading Process in Powder Bed Fusion Machines. Gaithersburg, MD: National Institute of Standards and Technology, 2023. http://dx.doi.org/10.6028/nist.ams.100-56.

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Wilkes, K. E., e P. W. Lucas. Development of optimum powders for powder evacuated panel insulation. Office of Scientific and Technical Information (OSTI), febbraio 1995. http://dx.doi.org/10.2172/10121566.

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Janney, M. A. Advanced powder processing. Office of Scientific and Technical Information (OSTI), aprile 1997. http://dx.doi.org/10.2172/494128.

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Kolman, David Gary. Automated Powder Dispenser. Office of Scientific and Technical Information (OSTI), giugno 2015. http://dx.doi.org/10.2172/1186045.

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Tennery, V. (Ceramic powder characterization). Office of Scientific and Technical Information (OSTI), ottobre 1988. http://dx.doi.org/10.2172/5651036.

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Copley, John R. D. Neutron powder diffraction. Gaithersburg, MD: National Institute of Standards and Technology, 1998. http://dx.doi.org/10.6028/nist.ir.6204.

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Crosbie, G. (Ceramic powder processing). Office of Scientific and Technical Information (OSTI), ottobre 1988. http://dx.doi.org/10.2172/5421064.

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Jacob, Gregor, Christopher U. Brown, M. Alkan Donmez, Stephanie S. Watson e John Slotwinski. Effects of powder recycling on stainless steel powder and built material properties in metal powder bed fusion processes. Gaithersburg, MD: National Institute of Standards and Technology, febbraio 2017. http://dx.doi.org/10.6028/nist.ams.100-6.

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Heater, Kenneth J. Development and Optimization of Powders for Large Area Powder Coatings. Fort Belvoir, VA: Defense Technical Information Center, maggio 1997. http://dx.doi.org/10.21236/ada377644.

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