Evaluation of y2O3 as front layer of ceramic crucibles for vaccum induction melting of TiAl based alloys

Joaquim Barbosa, C. Silva Ribeiro, O. M. N. D. Teodoro, Caetano Monteiro

Research output: Contribution to conferencePaper

11 Citations (Scopus)

Abstract

During 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 parts, in order to achieve a selling cost suitable with its application in consumer goods. A possible solution to decrease production costs might be the use of traditional casting techniques to produce near net shape functional parts. During the last years, the authors have developed extensive research work on this field, and a new technique both for melting and moulding, using ceramic multi-layered crucibles and investment casting shells was developed. This paper presents some of the results obtained during that research work: Ti-48Al alloy were melted and cooled inside CaO, MgO and Y 2 O 3 stabilized ZrO 2 crucibles with inside layer of Y 2 O 3 . The chemical composition, hardness and microstructure at the metal-crucible interface, studied by secondary ion mass spectrometry, SEM/EDS and XRS are presented. On a second step, the same alloy was melted on the same crucibles, and poured into graphite moulds, and the crucibles wall was characterized by SEM/EDS and XRS.

Original languageEnglish
Pages573-584
Number of pages12
Publication statusPublished - 17 Aug 2005
Event2005 TMS Annual Meeting - San Francisco, CA, United States
Duration: 13 Feb 200517 Feb 2005

Conference

Conference2005 TMS Annual Meeting
CountryUnited States
CitySan Francisco, CA
Period13/02/0517/02/05

Keywords

  • Ceramic Crucible
  • Induction Melting
  • TiAl

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    Barbosa, J., Ribeiro, C. S., Teodoro, O. M. N. D., & Monteiro, C. (2005). Evaluation of y2O3 as front layer of ceramic crucibles for vaccum induction melting of TiAl based alloys. 573-584. Paper presented at 2005 TMS Annual Meeting, San Francisco, CA, United States.