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Characterization of the metal/mould interface on the investment casting of gamm...
Barbosa, J.; Puga, Hélder; Ribeiro, Carlos Silva; Teodoro, O. M. N. D.; Monteiro, A. CaetanoThis paper describes the evaluation of different refractory compounds – SiO2, ZrO2 and Y2O3 – as face coats of investment casting shells for c-TiAl. The effect of the different refractories on the metal–mould interaction is studied in different aspects. Experimental results include characterisation of the constituents present at the metal/ mould interface, the segregation profiles of residual elements, namely o...
Evaluation of Y2O3 as front layer of ceramic crucibles for vaccum induction mel...
Barbosa, J.; Ribeiro, Carlos Silva; Teodoro, O. M. N. D.; Monteiro, A. CaetanoDuring the last decades titanium alloys were found to be valuable engineering materials for many different applications. Formerly used in critical applications like aerospace, aeronautic and military equipment, where the factor cost is not relevant, titanium alloys are finding now new and different markets. However, the development of such new markets will depend on an effective cost reduction of titanium part...
Effect of low level contamination on TiAl alloys studied by SIMS
Teodoro, O. M. N. D.; Barbosa, J.; Naia, M. Duarte; Moutinho, A. M. C.Titanium aluminides are a valuable alternative to superalloys in applications where the ratio resistance/density is important. Since the ordinary production routes lead to high final costs, an alternative might be the use of traditional casting techniques by induction melting of the alloy in a ceramic crucible and pouring into ceramic moulds, made by the investment casting process. However, due to the high reac...
Characterization of TiAl alloys by secondary Ion mass spectrometry
Barbosa, J.; Teodoro, O. M. N. D.; Ribeiro, Carlos Silva; Moutinho, A. M. C.; Monteiro, A. CaetanoTitanium aluminides are arising as a valuable alternative to superalloys in applications where the ratio resistance/density is important. Together with excellent mechanical and corrosion properties at high temperatures, such characteristics are very attractive for applications in the aeronautical, aerospace and automotive industries. However, the current high selling price, due to high costs of production and r...
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