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Dissertations / Theses on the topic 'Powder compacts'

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Published: 4 June 2021

Last updated: 4 February 2022

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1

Blackmore, Katherine Ann 1969. "Sintering of heterogeneous glass powder compacts." Thesis, The University of Arizona, 1995. http://hdl.handle.net/10150/291349.

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A modification of Scherer's Self-Consistent model and a new model, the Interlocking Cell model, have been developed to characterize the sintering behavior of mixtures of two glass powders. The theoretical sintering curves predicted by both these models are compared to each other and to experimental densification behaviors. Viscosities extrapolated from homogeneous sintering curves of sol-gel derived powders are transient and cannot be predicted based on composition alone. These transient viscosities have a significant effect on the sintering kinetics. The Self-Consistent and Interlocking Cell

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2

Jonsén, Pär. "Fracture and stress in powder compacts." Doctoral thesis, Luleå tekniska universitet, Material- och solidmekanik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18300.

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In the field of powder metallurgy (PM), the production methods are constantly developed and improved to produce components with high precision and strength. Cold uniaxial pressing of powder into a green body is a common process in PM. During uniaxial die powder pressing, the volume enclosed between the die and punches is reduced and the powder consolidates until a final height is obtained or a prescribed compacting pressure is reached. Desired properties of the green body are high strength, uniform density, no defects and narrow dimension tolerances. In the development process of new component

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3

Robinson, Jeremy St John. "Extrusion of rapidly solidified powder compacts." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46338.

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4

Shang, Chenglong. "Modelling powder compaction and breakage of compacts." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/10824.

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Experimental and numerical simulation studies were carried out to enhance the understanding of the compaction behaviour of powder materials and to study the breakage behaviour of tablets after compaction. In order to simulate powder compaction and post compaction behaviour an appropriate constitutive model is required. To calibrate the constitutive model (e.g. a Drucker-Prager Cap model) a series of experiments were carried out including closed die compaction, uniaxial and diametrical compression tests. A newly developed apparatus consisting of a die instrumented with radial stress sensors was

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5

Subrahmanyam, Gowri. "Sintering and its enhancement in ferrous powder compacts." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/32009.

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Sintering maps have been developed for pure iron compacts. The maps have been drawn as a function of various sintering parameters such as particle size, green density, time and temperature. Two sets of diagrams have been drawn to define the sintering kinetics, namely, the field map and the neck growth/shrinkage map. A new and simple method has been developed to construct the field maps, which define the dominant mechanisms of mass transport that contribute to neck growth under a given set of conditions of sintering. Shrinkage maps, which show how far the neck is growing or give % linear shrink

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6

Çelik, Emrah Güden Mustafa Thesis advisor. "Preparation and characterization of sintered Ti-6A1-4V powder compacts/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000472.doc.

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7

Candan, Ercan. "Wettability and pressurized infiltration of ceramic powder compacts by metallic melts." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286971.

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8

Gaboriault, Jr Edward M. "The Effects of Fill-Nonuniformities on the Densified States of Cylindrical Green P/M Compacts." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-theses/853.

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"We focus attention on single-punch compaction of metal powders in cylindrical dies. In one case, we consider solid cylindrical compacts, and take the die walls to be frictionless in order to isolate the effects of initial nonuniformities in powder fill on the final green density distribution of the compact. First, a model is introduced in which the die is filled with n distinct powders that occupy concentric annular regions within the die. The model requires that the balance of mass, the balance of momentum, and a realistic equation of state be satisfied in each region, and includes a plau

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9

Jee, Caroline Siew Yoke. "Experimental investigation and molecular dynamic simulation of binder removal in powder compacts." Thesis, Queen Mary, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409099.

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10

Steward, Nigel Ian. "Influence of particle size distribution on the sintering of ceramic powder compacts." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47674.

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11

Al-Sabbagh, Muhanad Nazar. "Influence of contact strength between particles on constitutive law for powder compaction and the strength of powder compacts." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42788.

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Powder compaction is used in a wide range of industrial applications ranging from powder metallurgy, food, pharmaceuticals, consumer goods, catalysts, fuels briquettes, etc. Powder compaction can be defined in terms of 1) compactibility, which represents the ability to form strong compacts, which is quantified by compact strength and 2) compressibility, which represents the ability of the powder mass to form dense compacts and is described by the constitutive law. The aim of this work is to establish relationships between particle properties, (including mechanical properties of particles and i

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12

Gaboriault, Edward M. "The effects of fill-nonuniformities on the densified states of cylindrical green P/M compacts." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0528103-105536.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: powder metallurgy; density distribution; compaction modeling; compact; powder; compaction. Includes bibliographical references (p. 141-142).

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13

Li, Tao. "Reaction-bonding of Crâ†2Oâ†3 ceramics." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318804.

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14

Saha, Deepak. "De-lubrication during sintering of P/M compacts : operative mechanism and process control strategy." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-10014-233109.

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15

Ng, Siak Hong. "Application of conventional machining techniques for green ceramic compacts produced by powder reaction moulding." Thesis, Nottingham Trent University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429429.

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16

Altındiş, Mustafa Güden Mustafa. "CaP coating of porous sintered Ti6Al4V powder compacts using biomimetic and sol-gel methods." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000544.pdf.

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17

Petersen, Shaheeda. "Investigation of the hot deformation of sintered titanium compacts produced from direct reduction powder." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/11748.

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Includes bibliographical references (leaves 110-111).<br>The focus of this study was the use of powder metallurgy to produce low cost titanium with comparative mechanical properties to wrought titanium. The objectives of this investigation was to produce sintered titanium compacts that represented metal made by the Direct Powder Rolling method. The critical strain (É›C) required to induce recrystallization following deformation was determined by hot compressing wrought titanium samples. Finally sintered titanium samples were hot compressed at É›C and the changes to the microstructure, porosity

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18

Saha, Deepak. "De-lubrication during sintering of P/M compacts: Operative mechanism and process control strategy." Digital WPI, 2004. https://digitalcommons.wpi.edu/etd-theses/1049.

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"De-lubrication is the first stage in a sintering operation, where the lubricants (higher weight hydrocarbons) are removed from the parts by controlled heating. Improper de-lubrication leads to defects such as blistering, sooting, micro-porosity etc in a sintered part. Most of these problems arise, as there exists a gap in the present understanding of de-lubrication. The primary motive of this work is to direct research towards the development of sensors and controls and thus, mitigate the various problems due to improper de-lubrication. Currently, there exists a myriad of lubricants being use

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19

Benzerrouk, Souheil. "Feasibility study of infrared detection of defects in green-state and sintered PM compacts." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0427104-165155.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: powder metallurgy; material evaluation; thermal imaging; NDE; IR radiation and detection; nondestructive testing; thermography; infrared imaging. Includes bibliographical references (p. 86-88).

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20

Benzerrouk, Souheil. "Active and Passive Thermography for the Detection of Defects in Green-State Powdermetallic Compacts." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-dissertations/386.

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"Despite its maturity, the powder metallurgy (PM) fabrication process continues to rely heavily on indirect methods to determine and predict the quality of its compacts early in the manufacturing line. Currently, the most comprehensive testing is performed on sintered parts, resulting in higher cost and increased waste. This dissertation addresses the need of early inspection by developing a novel approach whereby PM compacts are tested in the green-state without intrusion and with minimal cost per compact tested. The method is based on an infrared detection scheme with two fundamental embodim

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21

Smith, Graham T. "The secondary machining of Fe-Cu-C ferrous powder metallurgy compacts by turning, boring and drilling." Thesis, University of Birmingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395323.

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22

Galen, 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.

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23

Peacock, Simon. "Mechanical properties of rotary forged sintered steel compacts." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319953.

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24

O'brien, Jonathan. "Medium Power, Compact Periodic Spiral Antenna." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4926.

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Historical, well developed, procedures for RF design have minimal emphasis on exploring the third dimension due to the difficulty of fabrication. Recent material advancements applicable to 3D printing have brought about low-loss thermoplastics with excellent mechanical properties. Research into depositing conductive inks onto arbitrary 3D shapes has achieved resolutions better than 50 μm with conductivity values approaching that of copper cladding. The advancements in additive manufacturing have improved reliability and repeatability of three dimensional designs while decreasing fabrication ti

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25

Kolessar, Rémy. "Compact modeling of Si and SiC power diodes /." Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3186.

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26

Li, Hongbo. "Modeling Compact High Power Fiber Lasers and VECSELs." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202712.

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Compact high power fiber lasers and the vertical-external-cavity surface-emitting lasers (VECSELs) are promising candidates for high power laser sources with diffraction-limited beam quality and are currently the subject of intensive research and development. Here three large mode area fiber lasers, namely, the photonic crystal fiber (PCF) laser, the multicore fiber (MCF) laser, and the multimode interference (MMI) fiber laser, as well as the VECSEL are modeled and designed.For the PCF laser, the effective refractive index and the effective core radius of the PCF are investigated using vectori

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27

Fletcher, Steven. "Protection of physically compact multiterminal DC power systems." Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=19507.

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The use of DC for primary power distribution has the potential to bring significant design, cost and effciency benefits to microgrid, ship- board and aircraft applications. The integration of active converter technologies within these networks is a key enabler for these bene ts to be realised, however their in uence on an electrical network's fault response can lead to exceptionally demanding protection requirements. This represents a significant barrier to more widespread adoption of DC power distribution. The principle challenge within the field is to develop protection solutions which do no

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28

O'Connor, Kevin A. Curry Randy D. "Compact power conditioning and RF systems for a high power RF source." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/6285.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb. 19, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dr. Randy Curry, Thesis Supervisor Includes bibliographical references.

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29

Ahmed, Shehab. "Compact harsh environment energy conversion systems." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1289.

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30

Aripirala, Manoj Kumar. "A compact switching mode class-f power amplifier design." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55062.

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Even though there had been extensive research in Switching Mode Power Amplifier design their applications at industry level are quite limited. This is because a Fully-Integrated Switching Mode Power Amplifier using conventional active devices such as Bipolar Junction Transistors (BJT) or Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is challenging due to the inherent design challenges in the Switching Power Amplifier design. A Fully-Integrated Differential Class-F2,3 Power Amplifier design is explored for this Thesis research. This Power Amplifier has a maximum theoretical efficie

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31

Soares, Diogo Lopes. "Design of multidimensional compact constellations with high power efficiency." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11111.

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32

Rakhra, Puran. "On the protection of compact DC power systems with high-power energy storage." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28516.

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High-power energy storage systems (ESS) are being considered for future aerospace platforms and other compact DC power system applications to improve the overall transient performance of electrical power distribution systems. These sources are being integrated with advanced bidirectional power electronic converter interfaces with high bandwidth control systems and current limiting functionality. To date, the literature has primarily focused on the control and behaviour of high-power ESS during normal operating conditions with an emphasis on the systems level benefits they offer. Little conside

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33

Kim, Sunghwan. "Phase shifter approaches for compact low-power phased array transmitters." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p3398530.

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Thesis (Ph. D.)--University of California, San Diego, 2010.<br>Title from first page of PDF file (viewed May 5, 2010). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 103-109).

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34

Li, Z. M. "Power semiconductor devices : two-dimensional simulation and compact model development." Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637903.

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The mixed-mode modelling methodology is essential to extend the benefit of computer-aided design (CAD) techniques to the design of power electronic circuits. The mixed-mode environment can be established in two ways. One is through adopting device circuit models into the two-dimensional device simulator. The other is through introducing finite-element device models into the circuit simulator. In the first method, an effective numerical algorithm has been proposed for adopting advanced compact models for power devices into a general-purpose two-dimensional mixed-mode device/circuit simulator. A

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35

Colaç̦o, Andrea B. (Andrea Brazilin Immaculate Danielle). "Compact and low-power computational 3D sensors for gestural input." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91437.

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Thesis: Ph. D., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2014.<br>87<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 141-150).<br>Mobile devices have evolved into powerful computing platforms. As computing capabilities grow and size shrinks, the most pronounced limitation with mobile devices is display size. With the adoption of touch as the de facto input, the mobile screen doubles as a display and an input device. Touchscreen interfaces have several limitations: the act of touching t

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36

Lim, Yong Chuan Mark. "Slotted cylindrical ring (SCR) resonator for compact microwave filters." Thesis, University of Essex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364497.

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37

Todeschini, Fabien. "Dimensionnement énergétique de réseaux de capteurs ultra-compacts autonomes en énergie." Thesis, Supélec, 2014. http://www.theses.fr/2014SUPL0008/document.

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Les capteurs sans fil ont un avenir prometteur c’est pourquoi leur développement est àl’origine de nombreuses recherches. Leur autonomie reste cependant un problème à résoudre.Les travaux de cette thèse se concentrent précisément sur cette problématique : trouverune stratégie permettant aux capteurs d’être autonomes en énergie.L’énergie nécessaire à l’alimentation du capteur, quel que soit son mode de fonctionnement,doit en effet être récupérée de l’environnement dans lequel le capteur se trouve. Deplus, en cas d’absence ou d’insuffisance d’énergie environnante, le fonctionnement du capteurdoi

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38

Aston, Steven David. "Acoustic techniques for property estimation in green and fired ceramic powder compact components." Thesis, Keele University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323738.

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A commonly used process for the formation of ceramic wall tile bodies is powder compaction. Variations in density in wall tile bodies introduced by the compaction process can cause rejection at later stages of production. Quality control equipment currently employed does not identify reject bodies in the unfired state. Scope exists to reduce production costs by the timely removal of reject bodies in the unfired state. In this thesis an ultrasonic non-destructive technique is presented which allows the mapping of the density variations found in wall tile bodies in the unfired and fired states t

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39

Li, Li. "Extremely Compact High-Power Er3+-Yb3+-Codoped Phosphate Glass Fiber Lasers." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/193824.

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Extremely compact high-power fiber lasers operating at eye-safe telecom wavelength of 1.5 μm have been achieved by systematic experimental studies. Heavily Er3+-Yb3+-codoped phosphate glasses have been chosen as the host glass for our fibers and 1.5 μm lasers have been realized when pumped with 975 nm laser diodes.The first short-length cladding-pumped fiber laser with watt-level CW output power has been demonstrated by an 11-cm-long doped step-index phosphate fiber. Without active cooling, 1.5 W output power at 1535 nm has been obtained.Thermoelectric cooler has been used for heavily doped ph

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40

Mostaghim, Besarati Saeb. "Analysis of Advanced Supercritical Carbon Dioxide Power Cycles for Concentrated Solar Power Applications." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5431.

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Solar power tower technology can achieve higher temperatures than the most common commercial technology using parabolic troughs. In order to take advantage of higher temperatures, new power cycles are needed for generating power at higher efficiencies. Supercritical carbon dioxide (S-CO2) power cycle is one of the alternatives that have been proposed for the future concentrated solar power (CSP) plants due to its high efficiency. On the other hand, carbon dioxide can also be a replacement for current heat transfer fluids (HTFs), i.e. oil, molten salt, and steam. The main disadvantages of the c

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41

Wang, Wenhai Zavaliangos Antonios. "Towards an improved understanding of strength and anisotropy of cold compacted powder /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1865.

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42

Ghanadi, Mehdi [Verfasser], and Heino [Akademischer Betreuer] Henke. "A New Compact Broadband Radial Power Combiner / Mehdi Ghanadi. Betreuer: Heino Henke." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1019398558/34.

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43

Hasan, Md Naimul. "A Compact Low Power Bio-Signal Amplifier with Extended Linear Operation Range." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1358074945.

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44

Sajedin, M., Issa T. Elfergani, Jonathan Rodriguez, Raed A. Abd-Alhameed, M. Fernandez-Barciela, and M. Violas. "Ultra-Compact mm-Wave Monolithic IC Doherty Power Amplifier for Mobile Handsets." MDPI, 2021. http://hdl.handle.net/10454/18600.

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Yes<br>This work develops a novel dynamic load modulation Power Amplifier (PA) circuity that can provide an optimum compromise between linearity and efficiency while covering multiple cellular frequency bands. Exploiting monolithic microwave integrated circuits (MMIC) technology, a fully integrated 1W Doherty PA architecture is proposed based on 0.1 µm AlGaAs/InGaAs Depletion- Mode (D-Mode) technology provided by the WIN Semiconductors foundry. The proposed wideband DPA incorporates the harmonic tuning Class-J mode of operation, which aims to engineer the voltage waveform via second harmon

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45

Bonnet, Sebastien. "Combinaison de puissance hyperfréquence à faibles pertes et compacte." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0072/document.

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Ces travaux de thèse concernent le développement de combineur de puissance faibles pertes et compact selon une architecture planaire pour des applications amplificateur de forte puissance à état solide en bande X. La conception du combineur de puissance s’appuie sur l’étude de structures multicouches faibles pertes et compactes en triplaque à air suspendu. Une étude électromagnétique et thermique est proposée pour déterminer les performances de ces structures de transmission dans la bande X. Un système de refroidissement est également mis en place pour permettre aux structures de transmission

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46

Cunningham, John C. Zavaliangos Antonios. "Experimental studies and modeling of the roller compaction of pharmaceutical powders /." Philadelphia, Pa. : Drexel University, 2006. http://dspace.library.drexel.edu/handle/1860%20/837.

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47

Scarpignato, Gerardo Cristian. "Conception, fabrication et caractérisation d'un amplificateur de puissance à base de verres spéciaux pour les sources LIDAR." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT008.

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L'objectif de ce travail de recherche est l'étude, la réalisation et la caractérisation d'un amplificateur de puissance à base de verres spéciaux devant être inséré dans un dispositif laser impulsionnel à cohérence élevée opérant a la longueur d'onde de 1550 nm en configuration MOPA (Master Oscillator Power Amplifier). Il aura pour fonction d'amplifier le signal provenant d'un laser source afin de pouvoir le propager sur des distances élevées sans pour autant dégrader ses caractéristiques spectrales ou sa cohérence. Le dispositif ainsi obtenu sera utilisé comme source laser pour des systèmes L

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48

Counihan, Patrick John. "Nanostructured single-phase Ti₅Si₃ produced by crystallization of mechanically amorphized and shock densified powder compact." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19984.

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49

Dora, Venkata Mohana Murali Krishna [Verfasser]. "Compact storage-based resistance spot welding power supplies / Krishna Dora Venkata Mohana Murali." Paderborn : Universitätsbibliothek, 2016. http://d-nb.info/1117642097/34.

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50

Hoa, Xuyen D. 1976. "An investigation of a compact micro-optic and micromirror-based optical power equalizer /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81539.

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This thesis examines the design and characterisation of a compact optical power equalizer module for optical fiber telecommunication applications. The various components of the modules are separately examined in terms of their impact on the overall dimension, performance and loss of the equalizer module. Two components are studied in greater details, namely the micro diffractive optical elements (DOEs), responsible for the multiplexing/demultiplexing of the wavelength channels, and the micromirrors, responsible for creating the beam displacements and thus controlling the attenuation. Th

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