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Materials 2017, 10(2), 142; doi:10.3390/ma10020142

Analysis of the Influence of Starting Materials and Processing Conditions on the Properties of W/Cu Alloys

1
Department of Engineering and Materials Science and Transportation, School of Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Seville, Spain
2
RHP-Technology GmbH, Forschungs- und Technologiezentrum, 2444 Seibersdorf, Austria
3
Department of Computer Languages and Systems, University of Seville, Avenida Reina Mercedes s/n, 41012 Seville, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Jai-Sung Lee
Received: 8 December 2016 / Revised: 24 January 2017 / Accepted: 1 February 2017 / Published: 8 February 2017
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [6595 KB, uploaded 10 February 2017]   |  

Abstract

In this work, a study of the influence of the starting materials and the processing time used to develop W/Cu alloys is carried out. Regarding powder metallurgy as a promising fabrication route, the difficulties in producing W/Cu alloys motivated us to investigate the influential factors on the final properties of the most industrially demanding alloys: 85-W/15-Cu, 80-W/20-Cu, and 75-W/25-Cu alloys. Two different tungsten powders with large variation among their particle size—fine (Wf) and coarse (Wc) powders—were used for the preparation of W/Cu alloys. Three weight ratios of fine and coarse (Wf:Wc) tungsten particles were analyzed. These powders were labelled as “tungsten bimodal powders”. The powder blends were consolidated by rapid sinter pressing (RSP) at 900 °C and 150 MPa, and were thus sintered and compacted simultaneously. The elemental powders and W/Cu alloys were studied by optical microscopy (OM) and scanning electron microscopy (SEM). Thermal conductivity, hardness, and densification were measured. Results showed that the synthesis of W/Cu using bimodal tungsten powders significantly affects the final alloy properties. The higher the tungsten content, the more noticeable the effect of the bimodal powder. The best bimodal W powder was the blend with 10 wt % of fine tungsten particles (10-Wf:90-Wc). These specimens present good values of densification and hardness, and higher values of thermal conductivity than other bimodal mixtures. View Full-Text
Keywords: tungsten-copper alloys; microstructure; Rapid Sinter Pressing (RSP); thermal conductivity tungsten-copper alloys; microstructure; Rapid Sinter Pressing (RSP); thermal conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Montealegre-Meléndez, I.; Arévalo, C.; Perez-Soriano, E.M.; Neubauer, E.; Rubio-Escudero, C.; Kitzmantel, M. Analysis of the Influence of Starting Materials and Processing Conditions on the Properties of W/Cu Alloys. Materials 2017, 10, 142.

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