(19) |
 |
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(11) |
EP 0 311 203 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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12.09.1990 Bulletin 1990/37 |
(43) |
Date of publication A2: |
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12.04.1989 Bulletin 1989/15 |
(22) |
Date of filing: 03.10.1988 |
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(51) |
International Patent Classification (IPC)4: B22C 1/10 |
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(84) |
Designated Contracting States: |
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CH DE FR IT LI |
(30) |
Priority: |
07.10.1987 GB 8723582
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(71) |
Applicants: |
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- AE TURBINE COMPONENTS LIMITED
Yeadon
Leeds LS19 7AY (GB)
- THE UNIVERSITY OF LEEDS
Leeds, LS2 9JT (GB)
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(72) |
Inventors: |
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- Hamilton, Duncan Havelock
Kirkstall
Leeds, LS5 3DL (GB)
- Roberts, Edward Wilford
Bramhope
Leeds (GB)
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(74) |
Representative: Goddard, David John et al |
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HARRISON GODDARD FOOTE
1 Cottage Road Leeds LS6 4DD Leeds LS6 4DD (GB) |
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|
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(54) |
Foundry core material |
(57) Silica cores are described particularly though not exclusively for use in the manufacture
of precision cast components. The cores are dimensionally stable and resistant to
distortion at temperatures exceeding 1500°C. The silica cores contain ions selected
from the group comprising titanium, zirconium, phosphorus, vanadium, chromium, molybdenum
and tungsten. A preferred material is titania. The cores may contain between 0.05
and 10 wt% of titania to promote devitrification.