Composite core for casting processes, and processes of making and using same

(19)

(11)

EP 2 650 062 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	11.10.2017 Bulletin 2017/41

(43)	Date of publication A2:
	16.10.2013 Bulletin 2013/42

(21)	Application number: 13162368.8

(22)	Date of filing: 04.04.2013

(51)

International Patent Classification (IPC):

B22C 9/10^(2006.01)
B22C 9/24^(2006.01)

B22C 9/04^(2006.01)

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
	Designated Extension States:
	BA ME

(30)

Priority:

09.04.2012 US 201213442130

(71)	Applicant: General Electric Company
	Schenectady, NY 12345 (US)

(72)	Inventors:
	Liu, Shan Greenville, SC South Carolina 29615 (US) Potter, Kenneth Burrell Greenville, SC South Carolina 29615 (US) Feng, Ganjiang Greenville, SC South Carolina 29615 (US)

(74)	Representative: Pöpper, Evamaria et al
	General Electric Technology GmbH GE Corporate Intellectual Property Brown Boveri Strasse 7 5400 Baden 5400 Baden (CH)

(54)	Composite core for casting processes, and processes of making and using same

(57) A composite ceramic core (12) that, in combination with a shell mold (22), is suitable for use in a casting process to produce metal alloy components. The core (12) and casting process make use of a highly leachable interior layer (14) in combination with an exterior layer (16) that is less reactive than the interior layer (14) in the presence of common alloying elements. The interior layer (14) contains at least one hollow channel that allows a point of entry for a leaching solution, as well as exit for gaseous byproducts generated during the casting process.

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