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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Cyclic compaction of soft-hard powder mixtures /

Trivic, Nikola. Zavaliangos, Antonios. January 2003 (has links)
Thesis (M.S.)--Drexel University, 2003. / Includes abstract. Includes bibliographical references (leaves 57-59).
12

On Improving The Oxidation Resistance Of A Nickel-Based Superalloy Produced By Powder Metallurgy

Murray, Donald Clark 09 August 2012 (has links)
Nickel-based Superalloys are widely used in the steam turbine power generation and aerospace industries. They possess the desirable qualities of high-temperature strength, oxidation and corrosion resistance and can operate in some of the highest temperature ranges of the structural metals. The oxidation resistance of a Superalloy is achieved primarily through the formation of a dense alumina and/or chromia oxide layer(s) including spinels. This resistance has been further improved in wrought and cast alloys through the addition of reactive elements such as silicon, yttrium and lanthanum, although the exact effects of these elements have not been well defined. This project concentrated on a powder metallurgy ternary master alloy consisting of Ni-12Cr-9Fe (w/o) with additions of 6w/o aluminum, 0.5w/o Si, and 0.1w/o Y, in various combinations. Specifically, the primary goal was to produce and characterize a PM manufactured nickel-based Superalloy with minor additions of reactive elements and to assess the effectiveness of the Si and/or Y in improving the oxidation resistance. JMatPro modeling software was first used to help determine temperatures at which various events would occur in the alloys such as solutionizing and liquation temperatures. Subsequently green compacts were produced by a press (uni-axially) and sinter route to create transverse rupture strength bars (TRS bars). These bars were then thermomechanically deformed using a Gleeble tester to reduce porosity followed by a heat treatment to restore a microstructure better suited for high temperature oxidation. Sectioned TRS bars were then oxidized (static) 900?C in air for times up to 1000h and the influence of the Si/Y additions on oxidation resistance was determined via a combination of weight gain data and microstructural examination. Whereas JMatPro predicted solutionizing temperature of the compositions studied (1010°C quaternary; 1020°C quaternary + Si, respectively) these values were slightly lower than the results observed through DSC experiments (1045°C quaternary; 1065°C quaternary + Si, respectively). A w/o ?’ of approximately 25% was predicted by the modeling tool, but values of 58.3% to 61.7% were determined using a point count method. Finally, the addition of 0.5w/o Si to the quaternary Ni-Cr-Fe-Al PM system provided a measureable improvement in the oxidation resistance both in terms of thickness of oxide layer and in overall weight gain. Conversely, 0.1w/o Y provided little benefit, and was shown to be detrimental to alloys not containing Si.
13

The dynamic compaction of metal powders

Clyens, S. January 1978 (has links)
No description available.
14

Scale-up of hydrocyclones at low feed concentrations : Computer-aided grade efficiency evaluation and tests to verify a new theory for scale-up of hydrocyclones with a continuously variable inlet orifice

Medronho, R. A. January 1984 (has links)
No description available.
15

Thermo-mechanical behaviour of metal powders under high voltage electrical discharge

Can, Muhiddin January 1985 (has links)
No description available.
16

Study of radiative heat transfer in porous media for sintering applications /

Ip, Samuel Chun Hung. January 2002 (has links)
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002. / Includes bibliographical references (leaves 82-85). Also available in electronic version. Access restricted to campus users.
17

Age hardening of sintered Al-Cu-Mg-Si-Sn alloys /

Kent, Damon. January 2004 (has links) (PDF)
Thesis (Ph.D.) - University of Queensland, 2004. / Includes bibliography.
18

Effect of particle size and shape on stainless steel powder density, flow and compact density

Pearson, Gerald Joel, January 1967 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1967. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
19

The effect of powder characteristics on the sintering behavior of ultra-high molecular weight polyethylene

Mehta, Shirishkumar Dhirubhai. January 1982 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 211-221).
20

Preparacao e caracterizacao de filtro metalico monel (70porcentagemNi-30porcentagemCu)

LAVOS, IVONE de C. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:37:31Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:03:20Z (GMT). No. of bitstreams: 1 05173.pdf: 1370300 bytes, checksum: 1f8f952d1c96e1be263a349a734d80cd (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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