(19)
(11) EP 0 311 203 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.09.1990 Bulletin 1990/37

(43) Date of publication A2:
12.04.1989 Bulletin 1989/15

(21) Application number: 88202172.8

(22) Date of filing: 03.10.1988
(51) International Patent Classification (IPC)4B22C 1/10
(84) Designated Contracting States:
CH DE FR IT LI

(30) Priority: 07.10.1987 GB 8723582

(71) Applicants:
  • AE TURBINE COMPONENTS LIMITED
    Yeadon Leeds LS19 7AY (GB)
  • THE UNIVERSITY OF LEEDS
    Leeds, LS2 9JT (GB)

(72) Inventors:
  • Hamilton, Duncan Havelock
    Kirkstall Leeds, LS5 3DL (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)


(56) References cited: : 
   
       


    (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.





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