Journal ArticleDOI
Comparative properties of 85W–15Cu powders prepared using mixing, milling and coating techniques
TLDR
In this article, a mixture of 85W −15Cu (wt-%) powders with a composition of W and 15Cu were prepared by mixing, milling and mechanical alloying of W powders and electroless Cu coating onto W powder.Abstract:
Powders with a composition of 85W–15Cu (wt-%) were prepared by mixing, milling and mechanical alloying of W and Cu powders and electroless Cu coating onto W powder. Sinterability was improved by mechanical alloying and coating. The improvement due to mechanical alloying comes from a reduced particle size, assisted by activated sintering from transition element contamination in milling. Coating improved the copper dispersion, packing densities and led to a microstructure having reduced number of W–W particle contacts after compaction. Accordingly, rearrangement on liquid formation resulted in improved densification. Since copper wetting on tungsten is sensitive to oxygen contamination, coated powders ensure liquid copper dispersion throughout the compact without concern over wetting and liquid flow during liquid phase sintering.read more
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Sintering behavior of W–30Cu composite powder prepared by electroless plating
TL;DR: In this article, a powder metallurgy technique was employed to prepare W-30 ¾% Cu composite through a chemical procedure, including powder pre-treatment followed by deposition of electroless Cu plating on the surface of the pre-treated W powder.
Journal ArticleDOI
Preparation and properties of superfine W–20Cu powders by a novel chemical method
TL;DR: In this paper, a novel glycine-nitrate process (GNP) was developed to fabricate ultrafine W −20 ¼ Cu (W −20Cu) composite powders, with ammonium metatungstate [(NH4)6H2W12O40⋅xH2O], cupric nitrate trihydrate [Cu(NO3)2⋆3H2Os], and glycine[C2H5NO2] as a complexant and incendiary agent.
Book
Particulate Composites : Fundamentals and Applications
TL;DR: Particulate composites are a multi-billion dollar industry, and can be a cost-effective solution ripe for innovation and continued rapid growth as mentioned in this paper, which can be illustrated over a broad range of material and property combinations.
Journal ArticleDOI
Preparation of copper coated tungsten powders by intermittent electrodeposition
TL;DR: In this article, the influence of process parameters such as stirring frequency, load of tungsten powders, current density and deposition time were investigated, and the results indicated that high current density is necessary to produce high over-potential and to increase the fraction of nucleation, which was beneficial to the preparation of dense, uniform Cu films.
Journal ArticleDOI
Development of W-Cu-Ni Electrical Contact Materials with Enhanced Mechanical Properties by Spark Plasma Sintering Process
Magdalena Lungu,Violeta Tsakiris,E. Enescu,Delia Patroi,Virgil Marinescu,Dorinel Talpeanu,D. Pavelescu,Gh. Dumitrescu,A. Radulian +8 more
TL;DR: In this paper, Lungua et al. developed W Cu Ni Electrical Contact Materials with Enhanced Mechanical Properties by Spark Plasma Sintering Process M Lungua,∗, V Tsakiris, E. Enescu, D. P troi, V. T lpeanu, Gh. Dumitrescu and A.
References
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