A Study on integral recycling of valuable particle embedded composite wastes

Download
index.pdf
2019
Göynük, Tansu
Show full item record
203
views
76
downloads
Recovery of the valuable particle embedded composite cutting tools was achieved by electrodissolution and deposition techniques. Diamond embedded composite wastes including both bronze matrix and cobalt-copper-tin matrix were used to recycle comprehensively and efficiently within the scope of this thesis. The parameters like current density, temperature and electrolyte composition were optimized to obtain both diamond and metal constituents as compact, dense powder with minimum specific surface area and average particle size. Scanning electron microscope images, X-Ray diffraction analysis, particle size measurements and specific surface area measurements were evaluated to understand the effects of parameters on the electrodeposited powder qualities. Effects of hydrogen evolution on the properties of the collected metal powders were observed during optimization of the electrodeposition conditions. The morphology and the orientation of the powder growth were found to be affected by the hydrogen evolution reaction.
Cutting tools., Electroforming., Diamond cutting., Electrometallurgy., Powder metallurgy.
http://etd.lib.metu.edu.tr/upload/12623078/index.pdf
https://hdl.handle.net/11511/28002
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

An investigation on use of colemanite powder as abrasive in abrasive waterjet cutting (AWJC)
Cosansu, Gulay; Cogun, Can (2012-08-01)
In the present study, the cutting performance outputs (surface roughness, surface waviness and kerf taper angle) of colemanite powder as abrasive in abrasive watedet cutting (AWJC) with varying traverse rate and abrasive flow rate were investigated experimentally. The performance outputs were compared to that of garnet which is in common use in industry as abrasive in AWJC industry. A17075, marble, glass, Ti6Al4V and a composite material were selected as sample materials in the experiments. Furthermore, col...
An Experimental Study of Cutting Performances of Worn Picks
Dogruoz, Cihan; Bolukbasi, Naci; Rostami, Jamal; Acar, Cemil (2016-01-01)
The best means to assess rock cuttability and efficiency of cutting process for using mechanical excavation is specific energy (SE), measured in full-scale rock cutting test. This is especially true for the application of roadheaders, often fitted with drag-type cutting tools. Radial picks or drag bits are changed during the operation as they reach a certain amount of wear and become blunt. In this study, full-scale cutting tests in different sedimentary rock types with bits having various degree of wear we...
Investigation of the effect of orientation and heat treatment on the stress corrosion cracking susceptibility of 7050 aluminium alloy
Çevik, Gül; Doruk, Mustafa; Department of Metallurgical and Materials Engineering (2004)
In the present work, the effect of variation in specimen orientation and heat treatment on the Stress Corrosion Cracking (SCC) susceptibility of 7050 aluminum alloy was investigated in 3,5% NaCl solution and under freely corroding conditions. For this purpose, Constant Extension Rate Tests (CERT) was performed on precracked Compact Tension (CT) specimens and the Direct Current Potential Drop technique was applied to measure the crack lengths. In addition to crack length versus time curves, the relationship ...
Processing and characterization of high density tungsten-nickel-iron alloys
Çalışkan, Necmettin Kaan; Bor, Şakir; Durlu, Nuri; Department of Metallurgical and Materials Engineering (2013)
In the present study, processing of W-Ni-Fe alloys by liquid phase sintering technique has been investigated. Effect of sintering atmospheres (hydrogen and vacuum), tungsten content altering from 90 to 97 wt.%, Ni/Fe ratio varied from 2 to 4 and post sintering treatments (heat treatment and swaging) on the microstructure and mechanical properties of W-Ni-Fe alloys have been analyzed. Liquid phase sintered alloys were characterized by mechanical tests, electron microscopy and XRD studies, thermal analyses an...
Production and characterization of porous titanium alloys
Esen, Ziya; Bor, Şakir; Department of Metallurgical and Materials Engineering (2007)
In the present study, production of titanium and Ti6Al4V alloy foams has been investigated using powder metallurgical “space holder technique” in which magnesium powder were utilized to generate porosities in the range 30 to 90 vol. %. Also, sintering of titanium and Ti-6Al-4V alloy powders in loose and compacted condition at various temperatures (850-1250oC) and compaction pressures (120-1125 MPa), respectively, were investigated to elucidate the structure and mechanical properties of the porous cell walls...
Citation Formats
T. Göynük, “A Study on integral recycling of valuable particle embedded composite wastes,” M.S. - Master of Science, Middle East Technical University, 2019.
METU IIS - Integrated Information Service open@metu.edu.tr