Topic
Copper
About: Copper is a research topic. Over the lifetime, 122309 publications have been published within this topic receiving 1807723 citations. The topic is also known as: Cu & CU-7.
Papers published on a yearly basis
Papers
More filters
46 citations
TL;DR: In this paper, a seed-mediated growth in solution of copper nanorods was described, where poly(N-vinyl-2-pyrrolidone) (PVP) was used as a surface modified reagent as well as a soft template.
46 citations
TL;DR: In this paper, copper infiltration into tungsten fiber preforms (CITFP) under vacuum circumstance was used to produce W-Cu composites with compositions of 10-30% copper balanced with Tungsten.
Abstract: W–Cu composites were produced by the technique of copper infiltration into tungsten fiber preforms (CITFP) under vacuum circumstance. Fibrous structure preforms with various volume fraction of tungsten fiber were fabricated by the process of mold pressing and sintering. The molten copper was infiltrated into the open pores of the preforms under vacuum at 1473 K to 1573 K for 1 h to produce W–Cu composites with compositions of 10–30 wt.% copper balanced with tungsten. The microstructure, relative densities, and thermal properties of the composites were investigated and measured. The relative as-sintered density was enhanced with the increase of the sintering temperature. The thermal conductivity of the W–Cu30 composite with 28.2 wt.% Cu was 241 W/(m · K) at 298 K, 10% higher than that of the W–Cu alloy with similar copper content produced by conventional powder metallurgy process. The thermal expansion of the composites was decreased with the increase of tungsten content, keeping the same tendency as the prediction by the rule of weighted average of volume ratio of compositions.
46 citations
TL;DR: In this paper, three assemblages of ores have been recognized at the Proterozoic porphyry copper deposit, Malanjkhand, India, which are: (1) primary ores containing chalcopyrite and pyrite; (2) moderately oxidized ores including chalcocite, covellite, bornite, and other secondary copper sulfides; and (3) intensely oxidized ore containing copper sulphates, carbonates, chlorides, oxides and native copper.
46 citations
13 Jan 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a copper matrix composites reinforced with 0.2, 5 and 10 vol% single walled carbon nanotubes (SWCNT) and 5 volumetric multi-wall CNTs (MWCNTs) was processed by high energy attritor milling of pure copper powder with CNT and subsequently consolidated by spark plasma sintering (SPS).
Abstract: A Copper (Cu) matrix composites reinforced with 0.2, 5 and 10 vol% single walled carbon nanotubes (SWCNT) and 5 and 10 vol% multi-wall carbon nanotubes (MWCNT) was processed by high energy attritor milling of pure copper powder with carbon nanotubes (CNT) and subsequently consolidated by spark plasma sintering (SPS). Microstructural characterization shows a network of CNT along the grain boundaries and the presence of porosities at grain boundaries as well as triple junctions. By covering the particle boundaries, the higher volume fraction of CNT makes the sintering difficult as compared to single phase copper or low volume fraction CNT composites. Raman spectroscopy indicates that there is an increase in number of defects in the nanotube after milling and sintering of the composite. Mechanical properties evaluation shows that SWCNT composites results in higher strength and deformability compared to MWCNT. The failure strain decreases with increase in volume percent of CNT due to clustering of CNTs.
46 citations