Processing of gamma TiAl, by ceramic crucible induction melting, and pouring in ceramic shells

• Type: Article in International Scientific Journal
• Date: 2003

Authors

Joaquim Barbosa (Author) Other; Carlos Silva Ribeiro (Author) FEUP; Caetano Monteiro (Author) Other

Journal

The Journal is awaiting validation by the Administrative Services.

Title: Materials Science Forum - MSF

Vol. 426-432

Pages: 1933-1938

ISSN: 1662-9752

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-000-KPF

DOI: 10.4028/www.scientific.net/msf.426-432.1933

Abstract (EN): The production of high quality titanium and titanium alloys castings is a difficult and expensive task. The main reasons for that are: the high melting point; the extremely high reactivity of titanium alloys against a large amount of elements (solid, liquids and gaseous) at high temperatures, with particular emphasis to oxygen. For this reason, traditional casting techniques and materials cannot be used, both for the melting and the moulding operations, and melting and pouring have to be performed under vacuum or inert gas. However, such demands are extremely important factors to the high cost of titanium castings, and one possible way to decrease it might be the use of traditional casting techniques, with slight changes both on materials and production equipments and procedures. This paper describes the production technique of gammaTiA1 castings, using a multi-layered refractory crucible based on stabilized zirconia, and pouring in different refractory investment casting shells. Microhardness and residual elements concentration profiles, from the surface to the inside of castings, characterization of the metal-mould interface, and surface finish of samples will be presented and discussed, and results compared with the available bibliographic references, for this kind of alloy.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6