Tesi sul tema "Powder"
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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.
Testo completoHari, 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.
Testo completoAdditiv 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.
Cordts, Eike [Verfasser]. "Advanced Powder Characterization Techniques for Inhalation Powder Mixtures / Eike Cordts". Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/1064175279/34.
Testo completoBennett, 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.
Testo completoCihangir, Salih. "Powder pulse plating". Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/40974.
Testo completoNishantha, Hewamarappulige Indunil. "Powder Diffraction Methods". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222116031.
Testo completoBrisenmark, 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.
Testo completoAdditiv 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.
Hanson, S. M. J. "Powder co-injection moulding". Thesis, Cranfield University, 2000. http://dspace.lib.cranfield.ac.uk/handle/1826/3681.
Testo completoRathbone, T. "Aerated flow of powder". Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373688.
Testo completoYap, Siaw Fung. "Micromechanics and powder compaction". Thesis, University of Birmingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489036.
Testo completoGoodwin, A. L. "Dynamics from powder diffraction". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599515.
Testo completoOlsson, Erik. "Micromechanics of Powder Compaction". Doctoral thesis, KTH, Hållfasthetslära (Avd.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159142.
Testo completoQC 20150122
Sliwinski, Peter R. "Powder painting of aluminium". Thesis, Aston University, 1985. http://publications.aston.ac.uk/14478/.
Testo completoBruno, William M. Bridges William B. "Powder core dielectric waveguides /". Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-03192008-084301.
Testo completoKim, Michael 1973. "Experiments on powder metals". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47843.
Testo completoIncludes bibliographical references (leaves 138-142).
This thesis describes an experimental program aimed at the development of elastic-plastic constitutive relations for cold compaction of ANCOR MH-100 iron powder. A systematic experimental program consisting of triaxial compression, torsion ring shear, uniaxial strain compression, and simple compression test systems has been conducted to investigate the room temperature deformation response of powders ranging from a relative density of n = 0.4 - 0.9. A torsion ring shear apparatus has been designed and fabricated to investigate the frictional behavior of iron powder. The torsion ring shear apparatus is also used to examine the important interface frictional behavior between the powder compact and confinement dies.
by Michael Kim.
S.M.
Barnhart, Bradley K. Barnhart. "Characterization of Powder and the Effects of Powder Reuse in Selective Laser Melting". Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1500493469109699.
Testo completoHidalgo, Garcia Javier. "Development of binder systems based on CAB for powder injection moulding (PIM) and micro powder injection moulding (µ-PIM) of Zircon and Invar powders". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2043/document.
Testo completoThis PhD Thesis studied the use of binders based on cellulose acetate butyrate (CAB) andpoly(ethylene glycol) (PEG) in different type of materials, including a ceramic, the zirconiumsilicate, and a metallic alloy, the Invar 36. These materials share their low dimensionalstability with temperature with low coefficients of thermal expansion.The scope of this work is the study and comprehension of the behaviour of the mentionedbinder systems when they are employed in different PIM processes and under differentconditions and powder-types. With regard to this matter, different formulations were designedwith several types of PEG and CAB. These formulations were compared with commercialones. The intrinsic characteristics of each CAB were linked with the behaviour of the differentfeedstock also containing PEG and powder particles. The mixtures homogeneity, the optimumand critical solid loading and its flowability were assessed by torque and capillary rheology.Other complementary techniques such as electronic and light microscopy or the measurementof the mixtures densities by pycnometry were carried out to contrast rheology results. Thecompatibility between the feedstocks’ components and their thermal behaviour were analysedby calorimetry and thermogravimetry techniques. These methods were employed by the firsttime to determine the optimal solid loading.The optimal compositions were injected by using low or high pressures or by a micro injectionmoulding process. The debinding and sintering stages were optimised using severalatmospheres. Finally, the physical and mechanical properties of the final consolidated partswere measured.It could be concluded that the studied binder systems based on PEG and CAB presentedsuitable characteristics for PIM, providing improvements with respect to conventional bindersystems and by a more environmental friendly processing. However, that doctoral work wasjust a first approach to the use of these types of binder systems in PIM. Along this workseveral issues were detected and some topics regarding the processing should be furtherinvestigated to obtain the best of these binder systems
Montgomery, Colt James. "The Effect of Alloys, Powder, and Overhanging Geometries in Laser Powder Bed Additive Manufacturing". Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1112.
Testo completoKhambekar, Jayant Vijay. "Models for compaction and ejection of powder metal parts". Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0430103-145150/.
Testo completoMunoz, Romain. "Co-precipitation of Y2O3 powder". Thesis, KTH, Keramteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37102.
Testo completoMortazavi, Ramin. "Simulation of fine powder suspensions". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0015/MQ53593.pdf.
Testo completoCameron, I. M. "Powder characterisation for compaction modelling". Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636198.
Testo completoCorbella, Sarai Carbonell. "Characterisation of chocolate crumb powder". Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437074.
Testo completoSobiyi, Kehinde Kolawole. "Machining of powder metal titanium". Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6852.
Testo completoENGLISH ABSTRACT: The purpose of this study is to investigate the machinability of commercially pure (CP) titanium, manufactured using the press-and-sinter PM process. To this end, CP titanium powder (-200 mesh) was compacted and sintered in vacuum (10-4 torr) for two hours at 1200°C. Small cylindrical samples were compacted at pressures varying from 350 to 600 MPa in order to determine the compressibility of the powder. Following these tests, four larger stepped-cylinder samples were compacted at pressures close to 400 MPa and sintered under similar conditions. These samples had sintered densities varying between 3.82 and 4.41 g/cm3. They were used to evaluate the machinability of the sintered titanium using face turning machining tests. The samples were machined dry, using uncoated carbide (WC-Co) cutting tool. Cutting speeds between 60-150 m/min were evaluated while keeping the feed rate and depth of cut constant at 0.15 mm/rev and 0.5 mm, respectively. The final machined surface finish and the tool wear experienced during the face turning machining tests were monitored in order to evaluate PM titanium’s machining performance. This study showed that it is possible to use the press-and-sinter PM process with CP titanium powder, with a particle size of less than 75 μm (-200 mesh), to manufacture sintered titanium. However, particle shape influences the compressibility of the powder and pressing parts of larger volume, such as the machining test sample shape, is challenging when using such small particle size powder. Processing conditions, such as compaction pressure, sintering temperature and sintering time, influence the sintered density. Results from the machinability tests show that tool wear increases with a decrease in the porosity of the sintered titanium. A more porous sintered material has both lower strength and thermal conductivity. As these factors have opposing effects on the machinability of materials, it is concluded that the strength of the sintered titanium has a stronger influence on its machinability than the thermal conductivity. The cutting tool wear was uniform but showed indications of crater wear. The machined surface of the denser parts had minimal defects compared to less dense parts. Chip shape is long for the dense parts, and spiral for the less dense parts. The chips formed were all segmented, which is typical for titanium. The machinability of the sintered CP titanium was compared to that of wrought titanium alloys. As expected, it was found that the machinability of the sintered titanium was poor in comparison.
AFRIKAANSE OPSOMMING: Die doel van hierdie studie is om die masjineerbaarheid van kommersieel suiwer (KS) titaan, wat deur die pers-en-sinter poeiermetallurgie (PM) metode vervaardig word, te ondersoek. Om hierdie doel te bereik, is KS titaan poeier (-200 ogiesdraad) gekompakteer en gesinter in ‘n vakuum (10-4 torr) teen 1200°C vir 2 ure. Klein silindriese monsters is tussen drukke van 350en 600 MPa gekompakteer om die samedrukbaarheid van die poeier te bepaal. Na aanleiding van hierdie toetse, is vier groter trapvormige-silinder monsters by drukke naby aan 400MPa gekompakteer en onder soortgelyke omstandighede gesinter. Hierdie monsters het gesinterde digthede tussen 3.82 en 4.41 g/cm3 gehad. Hulle is gebruik om die masjineerbaarheid van die gesinterde titaan te ondersoek deur middel van vlak-draai masjineringstoetse. Die monsters is sonder smeermiddel gemasjineer met onbedekte karbied (WC-Co) snygereedskap. Snysnelhede tussen 60 – 150 m/min is geëvalueer terwyl die voertempo en diepte van die snit konstant by 0.15 mm/rev en 0.5 mm, onderskeidelik, gehou is. Die finale gemasjineerde oppervlak afwerking en gereedskapsslytasie tydens die vlak-draai masjinering toets is van die faktore wat gemonitor is sodat PM titaan se optrede tydens masjinering geëvalueer kan word. Hierdie studie wys dat diepers-en-sinter metode wel met KS titaan poeier, met ‘n partikel grootte van minder as 75 μm (-200 maas), gebruik kan word om gesinterde titaan te vervaardig. Die partikelgrootte beïnvloed wel die samedrukbaarheid van die poeier. Die samedrukking van parte met groter volume, soos bv die masjinerings toetsmonster, is uitdagend wanneer klein partikelgrootte poeier gebruik word. Proses omstandighede, soos kompaksie druk, sinteringstemperatuur en sinteringstyd, beïnvloed die gesinterde digtheid. Resultate van die masjineerbaarheidstoetse wys dat beitelslytasie toeneem met ‘n afname in porositeit van die gesinterede titaan. ‘n Meer poreus gesinterde materiaal het beide laer sterkte en termiese geleidingsvermoë. Aangesien hierdie faktore teenoorgestelde uitwerkings op masjineerbaarheid het, word dit dan afgelei dat die sterkte van gesinterde titaan ‘n groter invloed het op sy masjineerbaarheid as die termiese geleidingsvermoë. Die beitel se slytasie is hoofsaahlik, maar het tekens van kraterslytasie getoon. Die gemasjineerde oppervlak van die meer digte onderdele of toetsmonters het min gebreke gehad in vergelyking met die minder digte dele. Die vorm van die spaanders is lank vir digte parte, en spiraalvormig vir minder digte toetsmonsters. Die spaanders wat gevorm het, was almal gesegmenteerd, wat tipies is vir titaan. Die masjineerbaarheid van die gesinterde KS titaan is met dié van gesmede titaanallooie vergelyk. Soos verwag is, is gevind dat die masjineerbaarheid van die gesinterde titaan in vergelyking swak is.
Fredriksson, Christian. "Cyclone gasification of wood powder". Licentiate thesis, Luleå tekniska universitet, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26376.
Testo completoWu, Jin Jwang Flagan Richard C. "Powder synthesis in aerosol reactors /". Diss., Pasadena, Calif. : California Institute of Technology, 1987. http://resolver.caltech.edu/CaltechETD:etd-06152006-074336.
Testo completoScheiwiller, Thomas Scheiwiller T. "Dynamics of powder-snow avalanches /". [S.l.] : [s.n.], 1986. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7951.
Testo completoHo, Hsin Hsuan. "Fruit powders as a natural emulsifying agent: The importance of powder-added phase". Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263710.
Testo completoGalen, Steven Zavaliangos Antonios. "Path dependence and strength anisotropy of mechanical behavior in cold-compacted powders /". Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/438.
Testo completoDarniadi, Sandi. "Optimisation of foam-mat freeze-drying conditions for blueberry powder and evaluation of powder properties". Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18476/.
Testo completoKinnunen, Hanne. "Active sites, agglomerates or increased cohesion? : investigations into the mechanism of how lactose fines improve dry powder inhaler performance". Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564006.
Testo completoVIRGILLITO, ENRICO. "Metallic powders production via Gas Atomization: Material development for Laser Powder Bed Fusion processing". Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2971110.
Testo completoBradley, Jurron. "Consolidation of thermoplastic powder-coated towpreg". Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11302.
Testo completoIsmail, Ahmed. "Micro Mechanical Modelling of Metal Powder". Thesis, KTH, Matematik (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103245.
Testo completoBerg, Sven. "Ultra high-pressure compaction of powder". Doctoral thesis, Luleå tekniska universitet, Material- och solidmekanik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16908.
Testo completoGodkänd; 2011; 20111020 (bersve); DISPUTATION Ämnesområde: Hållfasthetslära/Solid Mechanics Opponent: Professor Javier Oliver, Dept of Strength of Materials and Structural Analysis, Technical University of Catalonia, Barcelona, Spain, Ordförande: Bitr professor Pär Jonsén, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Tid: Torsdag den 15 december 2011, kl 09.00 Plats: E246, Luleå tekniska universitet
Robinson, Jeremy St John. "Extrusion of rapidly solidified powder compacts". Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46338.
Testo completoFernando, M. S. D. "Traction induced compaction of maize powder". Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/38311.
Testo completoHolmes, Shaun Ryan. "Powder metallurgy dual alloy disc solutions". Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/252259.
Testo completoKero, Ida. "Ti3SiC2 synthesis by powder metallurgical methods". Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17858.
Testo completoGodkänd; 2007; 20070523 (ysko)
Häggblad, Hans-åke. "Constitutive modelling of hard metal powder". Licentiate thesis, Luleå tekniska universitet, Material- och solidmekanik, 1985. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17673.
Testo completoRammoorthy, Madhusudhan. "Consolidation of themoplastic powder coated towpregs". Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/11132.
Testo completoAddison, Julian Alston. "The electrostatic deposition of powder coatings". Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388929.
Testo completoWrighton, Smith Peter. "Delivery of particles by powder injection". Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393515.
Testo completoFaka, Marianthi. "Heat stability of skim milk powder". Thesis, University of Reading, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499360.
Testo completoJones, L. M. "Formation of nickel powder by decomposition". Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637462.
Testo completoDuncan-Jones, George. "Noise removal for powder diffraction profiles". Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543553.
Testo completoLitchwark, James Oliver. "Baghouse design for milk powder collection". Thesis, University of Canterbury. Chemical and Process Engineering, 2015. http://hdl.handle.net/10092/10208.
Testo completoElajnaf, Abdulmagid Khalefa. "Electrostatic characterisation of inhaled powder mixes". Thesis, University of Sunderland, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420515.
Testo completoLord, John David. "Particle interactions in dry powder inhalations". Thesis, University of Bath, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336708.
Testo completoVenables, Helena. "Powder blending : validating in-process controls". Thesis, Liverpool John Moores University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421394.
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