Composites of lead infiltrated copper fibres
* Aleksander Cyunczyk, ** Paweł Sosnowy * Politechnika Rzeszowska, Katedra Materiałoznawstwa, ul. Pola 2, 35-959 Rzeszów ** Wytwórnia Sprzętu Komunikacyjnego „PZL-Rzeszów” S.A., ul. Hetmańska 120, 35-952 Rzeszów
Annals 2 No. 3, 2002 pages 81-84
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abstract The investigations for producing a pseudoalloy Cu-Pb have been made. The Cu-Pb composites containing 60 and 70 volume per cent copper fibrous skeleton were fabricated by infiltration technique. Two kinds of copper fibres were applied: (1) the filamentary vapour-grown crystals of copper and (2) a cold-drawn copper wire. The Brenner technique for metallic whiskers growing from halides salts was used as a method of production of filamentary crystals, but modificated experimental conditions were applied (Figs 1 and 2). The filamentary crystals unexpected in shape were obtained instead of the perfect whiskers (Fig. 4). The cold-drawn 0.1 mm diameter copper wire was cut into 4÷6 mm length and etched in nitric acid. For the slurry felting method both kinds of copper fibres were beaten in to a slurry with a glycerine (Fig. 3). The product of felting was pressed and sintered and samples with porosity of 30 and 40% were obtained. During infiltration by gravity method all the pores were filled with lead. The mechanical properties of obtained composites are given in Table 1. The presented paper indicates that mechanical properties of Cu-Pb composites could be improved by incorporation of vapour-grown filament copper crystals.