Vpliv izhodne mikrostrukture bakra na izdelavo kompozita Cu-C

Rebeka Rudolf (Author), Ladislav Kosec (Author), Ivan Anžel (Author), Alojz Križman (Author)

Abstract

V prispevku obravnavamo proces notranjega ogljičenja, s katerim lahko izdelamo diskontinuirni kompozit Cu-C. Proces notranjega ogljičenja poteka brez pojava precipitacijske fronte, s sočasnim izločanjem grafitnih delcev po celotnem volumnu, potem ko se v trdni raztopini Cu-matice doseže, na defektih v kristalni mreži pa preseže nasičenost ogljika. Z analizo notranje ogljičenih vzorcev različnih izhodnih mikrostruktur Cu, ki so vsebovale različne vrste in koncentracije defektov (praznine, kristalne meje, dislokacije), smo ugotavljali vpliv izhodne mikrostrukture čistega Cu oz. posameznih vrst defektov na proces notranjega ogljičenja. Na osnovi dobljenih rezultatov in analiz lahko povzamemo, da pri notranjem ogljičenju različnih mikrostruktur čistega bakra precipitirajo iz kristalne mreže submikrometrsko majhni delci grafita. Volumenski delež in velikost grafitnih delcev sta odvisna od izhodne mikrostrukture bakra, temperature in časa notranjega ogljičenja. Največja gostota in najbolj enakomerna razporeditev grafitnih delcev sta doseženi pri gašenih vzorcih, kar kaže, da so klasterji praznin najbolj primerni element kristalne mreže za tvorbo grafitnih delcev.

Keywords

metalurgija;kompoziti;Cu-C;notranje ogljičenje;grafitni delci;vpliv defektov;mikrostruktura čistega bakra;

Data

Language:	Slovenian
Year of publishing:	2004
Typology:	1.01 - Original Scientific Article
Organization:	UM FS - Faculty of Mechanical Engineering
Publisher:	Inštitut za kovinske materiale in tehnologije Ljubljana
UDC:	669.018.9:669.3:620.18
COBISS:	9360150
ISSN:	1580-2949
Parent publication:	Materiali in tehnologije
Views:	748
Downloads:	72
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Other data

Secondary language:	English
Secondary title:	The influence of the copper microstructure on the production of a Cu-C composite
Secondary abstract:	This paper presents the internal carbonisation process involved in the fabrication of a discontinuous Cu-C composite. The precipitation process of carbon particles does not involve the precipitation of the carbonisation front but a simultaneous precipitation of carbon particles throughout the entire volume of the Cu-matrix. The carbon concentration in the matrix reaches its maximum solubility, whereas the carbon super saturation is achieved on the defects in the crystall lattice. With an analysis of internally carbonised samples, containing different types and densities of defects (vacancies, crystall grains, dislocations) we attempted to identify the influence of the initial, pure copper microstructure and the separate types of defects on the internal carbonisation process. On the basis of the results and analyses we concluded that with internal carbonisation of the pure copper microstructure the submicron graphite particles were formed. The volume fraction and the size of the precipitated graphite particles depend on the initial copper microstructure, on the temperature and on the time of internal carbonisation. The highest density and the most uniform distribution were obtained with quenched samples. The results have shown that the clusters of vaccancies are the strongest traps for carbon atoms and the most favorable places for graphite precipitation.
Secondary keywords:	metallurgy;composites;Cu-C;internal carbonisation;graphite particles;influence of defects;pure copper microstucture;
URN:	URN:NBN:SI
Type (COBISS):	Scientific work
Pages:	str. 317-324
Volume:	ǂLetn. ǂ38
Issue:	ǂšt. ǂ6
Chronology:	2004
ID:	1745034