| (19) |
 |
|
(11) |
EP 0 343 401 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
19.12.1990 Bulletin 1990/51 |
| (43) |
Date of publication A2: |
|
29.11.1989 Bulletin 1989/48 |
| (22) |
Date of filing: 02.05.1989 |
|
| (51) |
International Patent Classification (IPC)4: B22C 9/04 |
|
| (84) |
Designated Contracting States: |
|
CH DE FR IT LI |
| (30) |
Priority: |
19.05.1988 GB 8811799
|
| (71) |
Applicants: |
|
- AE TURBINE COMPONENTS LIMITED
Yeadon
Leeds LS19 7AY (GB)
- THE UNIVERSITY OF LEEDS
Leeds, LS2 9JT (GB)
|
|
| (72) |
Inventors: |
|
- Irwin, Steven Raymond
Otley
West Yorkshire, LS21 1DD (GB)
- Roberts, Edward Wilford
Bramhope
Leeds (GB)
|
| (74) |
Representative: Goddard, David John et al |
|
HARRISON GODDARD FOOTE
1 Cottage Road
Leeds LS6 4DD
Leeds LS6 4DD (GB) |
|
| |
|
| (54) |
Investment casting mould |
(57) A method and material for the manufacture of investment casting moulds are described.
The moulds so produced comprise relatively large alumina particles contained in a
matrix of fine alumina flour and a siliceous bonding phase. Preferably at least a
part of the alumina flour is constituted by alumina known as "reactive alumina". Preferably
the shell mould is fired at a temperature sufficiently high to allow at least a part
of the silica to combine with the alumina flour to form mullite in the matrix.