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Title:Microstructure analysis of internally oxidized Cu-C composite
Authors:ID Rudolf, Rebeka (Author)
ID Kosec, Ladislav (Author)
ID Križman, Alojz (Author)
ID Anžel, Ivan (Author)
Files:.pdf Metalurgija_2006_Rudolf_et_al._Microstructure_analysis_of_internally_oxidized_Cu-C_composite.pdf (1,20 MB)
MD5: AEBC4E77F9AA40FDA02002BAA35BE6B3
PID: 20.500.12556/dkum/fc1c92a4-5b6c-4025-92f3-f25aeda7f73b
 
URL http://hrcak.srce.hr/6514
 
Language:English
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:On the basis of experimentally obtained data, it was established that submicron-size bubbles are formed by the internal oxidation of Cu-C composite with fine dispersed graphite particles. They are homogeneously distributed in the Cu-matrix. This process starts with the dissolution of oxygen into the metal at the free surfaces, and continues with the diffusion of oxygen atoms into the volume of copper crystal lattice where they react with the graphite particles. The reactions of dissolved oxygen with carbon yield the gas products (CO2, CO), which cannot be dissolved in the crystal lattice of the matrix. The gas molecules, which are enclosed in the space previously occupied by the graphite, have a greater specific volume than the solid graphite. Consequently, compressive stresses arise in the copper matrix around the bubbles. The interaction of these stress fields with gliding dislocations during loading could improve the mechanical properties of the copper. The internal oxidation kinetic in Cu-C composite depends on the diffusion of oxygen in the copper matrix, and the penetration depth of the internal oxidation front indicates the parabolic nature of the process.
Keywords:metallurgy, Cu-C composites, internal oxidation, bubbles
Publication status:Published
Publication version:Version of Record
Year of publishing:2006
Number of pages:str. 79-84
Numbering:Letn. 45, št. 2
PID:20.500.12556/DKUM-66577 New window
ISSN:1334-2576
UDC:669.35'784.018.9:620.186
ISSN on article:1334-2576
COBISS.SI-ID:10111510 New window
NUK URN:URN:SI:UM:DK:7YJKQY0R
Publication date in DKUM:03.07.2017
Views:1180
Downloads:97
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
RUDOLF, Rebeka, KOSEC, Ladislav, KRIŽMAN, Alojz and ANŽEL, Ivan, 2006, Microstructure analysis of internally oxidized Cu-C composite. Metalurgija [online]. 2006. Vol. 45, no. 2, p. 79–84. [Accessed 19 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=66577
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Record is a part of a journal

Title:Metalurgija
Publisher:Hrvatsko metalurško društvo
ISSN:1334-2576
COBISS.SI-ID:524301593 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:Z2-6317
Name:Razvoj tehnologije izdelave kovinskih materialov, utrjenih s plinskimi porami nanometrske velikosti

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:03.07.2017

Secondary language

Language:Slovenian
Title:Mikrostrukturna analiza unutarnje oksidiranog Cu-C kompozita
Abstract:Na osnovi eksperimentalnih rezultata utvrđeno je da pri unutrašnjoj oksidaciji Cu-C kompozita s finom disperzijom grafitnih djelića nastaju sub-mi- kronske pore. One su homogeno razpoređene u Cu-matici. Proces počinje otapljanjem kisika na slobodnoj površini metala i nastavlja s difuzijom kisika u kristalnu rešetku Cu-matrice gdje kisik reagira s grafitnim djelićima. Reakcija otopljenog kisika s grafitom daje plinske molekule (CO2, CO) koje se ne mogu rastopiti u kristalnoj rešetki matrice. Plinske molekule koje se nalaze u prostoru gdje je prije toga bio grafit, imaju veći specifični volumen od čvrstog grafita. Posljedično nastaju u matrici oko pora tlačne napetosti. Interakcija ovih napetosti s kliznim dislokacijama pod opterećenjem može poboljšati mehaničke karakteristike bakra. Zapaženo je da je kinetika unutarnje oksidacije u Cu-C kompozitu ovisna od difuzije kisika u Cu-matrici i da penetracijska dubina fronte unutrašnje oksidacije ukazuje na paraboličnu prirodu procesa.
Keywords:metalurgija, Cu-C kompoziti, notranja oksidacija, pore


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