EP 1670604 A1 20060621 - PROCESS FOR OBTAINING Y-TiAL PIECES BY CASTING
Title (en)
PROCESS FOR OBTAINING Y-TiAL PIECES BY CASTING
Title (de)
VERFAHREN ZUM ERHALT VON Y-TiAL-TEILEN DURCH GIESSEN
Title (fr)
PROCEDE POUR PRODUIRE DES PIECES EN Y-TIAL PAR MOULAGE
Publication
Application
Priority
- PT 2004000023 W 20040910
- PT 10301803 A 20030912
Abstract (en)
[origin: WO2005025778A1] The present invention concerns the development of a process for obtaining gamma-TiAl castings, with a maximum thickness of 20 mm, starting from melting charges constituted by commercially pure Ti and Al. In this process the metallic charge is induction melted in a ZrO2 ceramic crucible inside coated with Y2O3, the pouring being performed by centrifugation in ZrO2 moulds, with an Y2O3 contact coating, obtained by the lost wax moulding process. The whole sequence of operations is accomplished under argon atmosphere. The use of this process, besides avoiding the use of previously melted charges needing very specific furnaces, allows to obtain parts with homogeneous chemical composition and very low contamination with residual elements, without surface oxidation, with a hardness quite uniform from the surface to the inside of castings, which reveal a surface finishing identical to that recommended by the international standards for steel castings obtained by the same moulding process.
IPC 1-7
B22D 17/00; B22D 47/00; B22D 21/00; C22C 47/08; C22C 49/04; C22C 49/14
IPC 8 full level
B22D 17/00 (2006.01); B22D 21/00 (2006.01); B22D 21/04 (2006.01); B22D 47/00 (2006.01); C22C 47/08 (2006.01); C22C 49/04 (2006.01); C22C 49/14 (2006.01)
CPC (source: EP US)
B22D 21/005 (2013.01 - EP US)
Citation (search report)
See references of WO 2005025778A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005025778 A1 20050324; EP 1670604 A1 20060621; PT 103018 A 20050331; US 2007267165 A1 20071122
DOCDB simple family (application)
PT 2004000023 W 20040910; EP 04775189 A 20040910; PT 10301803 A 20030912; US 57167704 A 20040910