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Materials 2017, 10(2), 142;

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

Department of Engineering and Materials Science and Transportation, School of Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Seville, Spain
RHP-Technology GmbH, Forschungs- und Technologiezentrum, 2444 Seibersdorf, Austria
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)
Full-Text   |   PDF [6595 KB, uploaded 10 February 2017]   |  


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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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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