(19)
(11) EP 0 347 344 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.02.1991 Bulletin 1991/09

(43) Date of publication A2:
20.12.1989 Bulletin 1989/51

(21) Application number: 89420208.4

(22) Date of filing: 12.06.1989
(51) International Patent Classification (IPC)4: B22C 9/04, B22C 13/08
(84) Designated Contracting States:
DE FR GB

(30) Priority: 13.06.1988 US 205731

(71) Applicant: HOWMET CORPORATION
Greenwich, CT 06830 (US)

(72) Inventors:
  • Johnson, Paul Randolph
    Whitehall Michigan 49461 (US)
  • Lassow, Eliot Scott
    N. Muskegon Michigan 49445 (US)

(74) Representative: Séraphin, Léon et al
PECHINEY 28, rue de Bonnel
F-69433 Lyon Cedex 03
F-69433 Lyon Cedex 03 (FR)


(56) References cited: : 
   
       


    (54) Ceramic shell mold for investment casting and method of making the same


    (57) A ceramic shell mold and method of making the same. The ceramic shell mold includes a facecoat layer comprised of a first ceramic material. A plurality of alternating layers are formed overlaying the facecoat layer. The alternating layers are comprised of a second ceramic material and a third ceramic material, the third ceramic material having thermophysical properties different than the second ceramic material. The second ceramic material and the third ceramic material are preferably a zircon-based material and an alumina-based material, respectively. The resultant ceramic shell mold has a greater high temperature creep resistance than a shell mold formed solely from the second ceramic material or solely from the third ceramic material.







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