Effect of temperature on mechanical characteristics of copper–chromium composite

Bukhanovsky, V. V.; Rudnitsky, N. P.; Mamuzich, I.

doi:10.1179/174328408x365829

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…The Cu- (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) wt.% W specimens exhibit an undulating fracture and delamination ( Fig. 4a and 4c) corresponding to the tungsten enrichment of the surface layers oriented towards the bath.…”

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confidence: 94%

“…The Cu- (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) wt.% W condensed composites with a laminar structure, which have a fairly high mechanical and electrophysical characteristics, can be recommended for break-contact components in switchgears for medium-and high-current electrical networks. The composites with a cone-shaped structure (with a tungsten concentration varying from 20 to 40 wt.%), which feature high strength and hardness especially at elevated temperatures, are suitable for the fabrication of working surfaces of electrodes for contact welding machines as well as electrodes for electrical discharge machining for metallic materials including hardmetals.…”

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confidence: 98%

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“…More than ten years of practical experience in using the condensed electrical-contact materials in Ukraine and abroad have demonstrated their high operational reliability, endurance, and efficiency, which ensures their indisputable advantages over electrical-contact materials produced by conventional processes. In particular, practice has proved that in the condensed microlayered materials the secondary structure, which arises at the electrical contact surface in the arc discharge zone during the contact pair opening and leads to the surface fracture through electric erosion, has a far smaller depth than that in PM materials [8][9][10][11][12][13][14][15].It is evident that the higher the melting point of the refractory component in the condensed microlayered composite, the better the material's properties at elevated temperatures and its electroerosion resistance under arc discharge conditions. The most attractive from this standpoint is the use of tungsten which has the highest melting point among all the known metals.…”

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Relationship between composition, structure, and mechanical properties of a condensed composite of copper–tungsten system

Bukhanovs’kyi¹,

Rudnyts’kyi²,

Kharchenko³

et al. 2011

Strength Mater

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For a copper-tungsten microlayered composite material for electrical contact applications, which is prepared by electron-beam evaporation-condensation, the changes in its structure, conductivity, hardness, and mechanical properties in tension at room temperature and elevated temperatures are studied versus the tungsten content and heat treatment conditions. New morphological features of the condensed composite and the related changes in the material properties have been revealed. The conditions for the formation of structural defects and their influence on mechanical properties and fracture behavior of the material in tensile tests have been investigated. A relationship has been established between the tungsten content of the composite, its structure, strength, and hardness.Introduction. The present-day composite materials (CM) based on tungsten and copper were developed in the second half of the 20th century. These pseudoalloys which are usually prepared by powder metallurgy (PM) methods have been widely accepted for electrical, structural, and special applications. Despite a long-term experience of using these materials, the research efforts in this field are still pursued, which is due to an extension of technological potentialities for controlling the CM composition, dispersion, distribution of the refractory component inside the product, etc. [1][2][3][4][5][6][7]. Considering that electrical and thermal conductivities of tungsten are lower than those of pure copper, there arises the necessity to search for technological possibilities of producing combined products. In these products the Cu-W composite is used only for facing the contact components of electrical switchgear, which significantly changes the components' functionalities. The implementation of the combined product design presents some difficulties for the quality of the copper body/composite facing interface has to be thoroughly inspected. These difficulties as well as the necessity to separately prepare the facing and the contact component can be in some cases eliminated owing to the use of a technology with provides microlayer gradient composites.Fundamentally new possibilities for the production of these materials have arisen owing to the development of electron-bean units and the elaboration of a process of high-rate electron-beam evaporation of the CM components from separate water-cooled crucibles with subsequent layer-by-layer condensation of the mixed vapor flow onto a metal substrate [8][9][10][11][12]. The main and undeniable benefits offered by the electron-beam technology which provides new-generation electrical-contact composites based on copper and refractory metals are as follows:(i) the possibility of atomic-and molecular-level mixing of vapor flows of substances that have a limited mutual dissolubility and producing composite materials and coatings with a preset structure, chemical composition, physical-mechanical properties and performance, which cannot be achieved by any other available methods; 426 0039-2316/11/4304-0426 (ii) ...

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confidence: 94%

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confidence: 98%

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confidence: 99%

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confidence: 99%

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Relationship between composition, structure, and mechanical properties of a condensed composite of copper–tungsten system

Bukhanovs’kyi¹,

Rudnyts’kyi²,

Kharchenko³

et al. 2011

Strength Mater

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“…[1][2][3][4][5][6] In addition to the conventional powder metallurgy processes for producing these materials, they are also obtained by high rate electron beam evaporation of copper and carbon from individual water cooled crucibles, with layer by layer condensation of the mixed vapour flow on a rotating steel disk. [7][8][9][10][11][12][13] The technology of high rate electron beam evaporation-condensation is the alternative to powder metallurgy: the thermal dispersion of the liquid melt and consolidation of dispersed particles flow (without special molding to obtain a high-density material state) with a limited amount of admixtures within a closed space. The apparent advantages of the electronbeam technology, which makes the development of a new generation of composite materials for electrical contacts possible, are as follows:…”

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Vapour-phase condensed composite materials based on copper and carbon

Bukhanovsky¹,

Rudnytsky²,

Grechanyuk³

et al. 2016

Mater. Tehnol.

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The production technology, structure, electrical conductivity, coefficient of friction, hardness, strength, and plasticity over a temperature range of 290-870 K of copper-carbonic composites with laminated structures and carbon contents from 1.2 to 7.5 % of volume fractions for sliding electrical contacts of current-collecting devices obtained by electron-beam evaporation and vapor condensation are studied. Thermodynamic activation analysis of the hardness and strength of the composites was carried out. Correlations between the hardness and strength of the composites were established.

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Production technology, structure and properties of Cu–W layered composite condensed materials for electrical contacts

Bukhanovsky

Grechanyuk²,

Minakova

et al. 2011

International Journal of Refractory Metals and Hard Materials

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Effect of temperature on mechanical characteristics of copper–chromium composite

Cited by 6 publications

References 7 publications

Relationship between composition, structure, and mechanical properties of a condensed composite of copper–tungsten system

Relationship between composition, structure, and mechanical properties of a condensed composite of copper–tungsten system

Vapour-phase condensed composite materials based on copper and carbon

Production technology, structure and properties of Cu–W layered composite condensed materials for electrical contacts

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