Investigation of nanocrystalline sintered W-25 wt% Cu composite

Mikó, Tamás; Kristály, Ferenc; Petho, D; Svéda, Mária; Karacs, Gábor; Gergely, Gréta; Gácsi, Zoltán; Roósz, András

doi:10.1016/j.ijrmhm.2020.105438

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…The properties of different nc WAl alloys, including a W 80 Al 20 as the one studied in this work, have been described recently, showing that the addition of Al resulted in a significant improvement of coarsening resistance and sinterability with respect to pure commercial tungsten 24 . Regarding nc WCu, the characteristics of this alloy were also recently investigated 25 . W and Cu are immiscible metallic systems that are alloyable by the application of mechanical alloying, combining the excellent attributes of the W (high thermomechanical and radiation shielding features) with those of the Cu (high thermal and electric conductivity) 12,26 .…”

Section: Resultsmentioning

confidence: 99%

Toxicological assessment of nanocrystalline metal alloys with potential applications in the aeronautical field

Rumbo

Bianchin

Locci

et al. 2022

Sci Rep

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The development of new candidate alloys with outstanding characteristics for their use in the aeronautical field is one of the main priorities for the sector. In this context, nanocrystaline (nc) alloys are considered relevant materials due to their special features, such as their exceptional physical and mechanical properties. However, another important point that needs to be considered with newly developed alloys is the potential toxicological impact that these materials may have in humans and other living organisms. The aim of this work was to perform a preliminary toxicological evaluation of three nc metal alloys (WCu, WAl and TiAl) in powder form produced by mechanical alloying, applying different in vitro assays, including a mix of W-Cu powders with standard grain size in the experiments to stablish comparisons. The effects of the direct exposure to powder suspensions and/or to their derived leachates were analysed in three model organisms representative of human and environmental exposures (the adenocarcinomic human alveolar basal epithelial cell line A549, the yeast Saccharomyces cerevisiae and the Gram negative bacterium Vibrio fischeri). Altogether, the results obtained provide new insights about the potential harmful effects of the selected nc alloys, showing that, from a toxicological perspective, nc TiAl is the safest candidate in the model organisms and conditions tested.

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Section: Resultsmentioning

confidence: 99%

Toxicological assessment of nanocrystalline metal alloys with potential applications in the aeronautical field

Rumbo

Bianchin

Locci

et al. 2022

Sci Rep

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“…However, some technological process issues related to the production of powders are detrimental for the quality of the precursor and the final product. For example, the mixture becomes contaminated with foreign elements during high-energy ball grinding [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sintering Temperature on the Microstructure and Properties of a W-Cu Pseudo-Alloy

Lebedev,

Promakhov,

Schulz

et al. 2023

Metals

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This paper studies the feasibility of fabricating pseudo-alloys based on a W-Cu system through vacuum sintering of spherical bimetallic particles synthesized using the electric explosion of copper–tungsten wires in argon. The effects of the sintering temperature on the structure and hardness of the fabricated composites was studied. In terms of the structure of the samples, tungsten particles of predominantly spherical shapes with sizes ranging from submicrons to 80–90 µm were uniformly distributed throughout the copper matrix. Based on the analysis, the volume fractions of tungsten and copper were approximately equal. The calculated average phase compositions for all the samples were 58.9 wt% for W, 27.3 wt% for Cu, and 13.8 wt% WO2. When the annealing temperature increased from 1100 °C to 1250 °C, the wetting of tungsten by molten copper improved, which resulted in the porosity of the copper matrix being at the minimum, as observed in the contact zone. Due to good wetting and a decrease in the viscosity of copper, rearrangement of the solid phase of the tungsten in the bulk of the composites improved, and the density and hardness of the pseudo-alloy increased. The formation of coarse tungsten grains is caused by the fact that submicron and micron particles are growing in size and merging into agglomerates during the course of liquid-phase sintering, and this happens because of the high surface activity of ultrafine particles. Further research will be devoted to solving the discovered problems.

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“…Due to its excellent arc erosion resistance, high thermal conductivity, low thermal expansion, and superior mechanical properties, tungsten-copper (W–Cu) composite is widely used in high-voltage circuit-breakers, heat sink materials, shaped charge liners, etc. [ 1 , 2 , 3 , 4 , 5 , 6 ]. For heat sink materials, the W content of the W–Cu composite is 80–90 wt%, due to the requirement to match the thermal expansion coefficient of the substrate materials.…”

Section: Introductionmentioning

confidence: 99%

“…For heat sink materials, the W content of the W–Cu composite is 80–90 wt%, due to the requirement to match the thermal expansion coefficient of the substrate materials. Liquid phase sintering and infiltration are usually used to prepare W–Cu composite [ 2 , 4 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. However, it is hard to fabricate W–Cu composite with a high W content (>80%) by liquid phase sintering because W and Cu are not mutually soluble.…”

Section: Introductionmentioning

confidence: 99%

W–Cu Composite with High W Content Prepared by Grading Rounded W Powder with Narrow Particle Size Distribution

Chen

Zhang

et al. 2022

Materials

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In this study, the W (10–20%)–Cu composites were simultaneously fabricated using commercial, graded commercial, and graded jet-milled W powder. The results show that the W–Cu composites prepared with the graded jet-milled W powders have the highest density and best comprehensive performance due to the combined effect of the particle gradation and jet-milling treatment. Particle gradation is employed to increase the packing density of powders, thereby increasing the relative density of the compressed W skeleton, and the rounded powder with narrow particle size distribution after jet-milling treatment is used to reduce the enclosed pores formed during the process of compacting and infiltration. W–Cu composites with a high density of 16.25 g/cm3 can be directly obtained by conventional compacting at a low pressure of 300 MPa and following infiltration.

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Investigation of nanocrystalline sintered W-25 wt% Cu composite

Cited by 13 publications

References 16 publications

Toxicological assessment of nanocrystalline metal alloys with potential applications in the aeronautical field

Toxicological assessment of nanocrystalline metal alloys with potential applications in the aeronautical field

Effects of Sintering Temperature on the Microstructure and Properties of a W-Cu Pseudo-Alloy

W–Cu Composite with High W Content Prepared by Grading Rounded W Powder with Narrow Particle Size Distribution

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Investigation of nanocrystalline sintered W-25 wt% Cu composite

Cited by 13 publications

References 16 publications

Toxicological assessment of nanocrystalline metal alloys with potential applications in the aeronautical field

Toxicological assessment of nanocrystalline metal alloys with potential applications in the aeronautical field

Effects of Sintering Temperature on the Microstructure and Properties of a W-Cu Pseudo-Alloy

W–Cu Composite with High W Content Prepared by Grading Rounded W Powder with Narrow Particle Size Distribution

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Investigation of nanocrystalline sintered W-25 wt% Cu composite