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Influence of Al2O3concentration in yttria based face coats for investment casting Ti–45Al–2Mn–2Nb–0·2TiB alloy

Authors :
Paul Anthony Withey
Stuart Blackburn
Chen Yuan
Xu Cheng
Source :
Materials Science and Technology. 30:1758-1764
Publication Year :
2013
Publisher :
Informa UK Limited, 2013.

Abstract

An Al2O3–Y2O3 based face coat material was researched by adding Al2O3 into yttria in different concentrations to reduce the mould cost whilst retaining the face coat chemical inertness. The face coat compositions and sintering properties at different temperatures were investigated using X-ray diffraction, friability and dilatometers. Meanwhile, the chemical inertness of the face coats was identified using a sessile drop test method to interact with a Ti–45Al–2Mn–2Nb–0·2TiB alloy. The results show that at different firing temperatures, a series of phase transformations have taken place between Y2O3 and Al2O3, resulting in different face coat compositions and sintering properties. However, the chemical inertness of the face coat against the molten TiAl alloy was not influenced by the phase transformations, and it was dependent on the amount of Al2O3 added to the face coat. In this experiment, no interaction was observed between the Al2O3–Y2O3 face coat material and TiAl alloy when Al2O3 additions we...

Details

ISSN :
17432847 and 02670836
Volume :
30
Database :
OpenAIRE
Journal :
Materials Science and Technology
Accession number :
edsair.doi...........45c5ae784da45670447a06e5c0da491b
Full Text :
https://doi.org/10.1179/1743284713y.0000000467