Technical aspects of composite casting production with lost wax method
Mirosław Cholewa, Bolesław Formanek 1Politechnika Śląska, Wydział Mechaniczny Technologiczny, Instytut Materiałów Inżynierskich i Biomedycznych, Zakład Odlewnictwa ul. Towarowa 7, 44-100 Gliwice, Poland 2 Politechnika Śląska, Wydział Inżynierii Materiałowej, Katedra Nauki o Materiałach, ul. Krasińskiego 8, 40-018 Katowice, Poland
Quarterly No. 3, 2008 pages 215-219
DOI:
keywords: composite, LWP, wibration, electromagnetic field
abstract In this work technical limits and potential possibilities of using lost wax method for dispersion composite castings production were presented. For investigations as a test casting the car ventilated brake disc with dimension ø(255/123)x22 mm was used. Composites made of aluminium alloy EN AC-AlSi11 as matrix were tested. In tested castings double reinforcement was used with both ceramics and metallic particles. Metallic particles (CrFe25C10)p with granularity 0.4 mm fulfilled fundamental reinforcing function, are classic ex-situ reinforcement which generates profitable tribological features caused by chromium carbide presence. Function of additional, fine-dispersion reinforcing fulfilled (Cr3C2)p, (Cr3C2+TiC)p phases which were separately inserted composite powder content. Powders with fine-dispersion carbide phases (chromium and chromium with titanium) have been obtained by powder metallurgy techniques. The other kind of separately, additional reinforcement were oxides mainly (Al2O3)p originating in liquid matrix treatment with ozone. Liquid composite suspensions with total content of reinforcement over 40% wt. were produced. Suspensions were poured to self-supporting moulds made with lost wax technology. Pouring process regarding significant viscosity and low castability of suspensions was aided by external influence on mould or internal influence on metal. Effectiveness of mould cavity pouring process aided by mechanical vibration and linear reversing electromagnetic field was confirmed.