Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Patent
1994-10-31
1996-03-12
Lopez, F. Daniel
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
428 345, 428212, F01D 518
Patent
active
054981328
ABSTRACT:
A hollow cast product such as a gas-cooled gas turbine engine blade is formed using a composite core constructed by forming a first core part determinative of the cavity size of the trailing edge blade portion from a first ceramic material and joined to a second core part determinative of the blade cavity for the blade body portion which is formed from a second ceramic material. The first and second ceramic materials can be chosen to have appropriate characteristics grain sizes, flowability, leachability, and/or reactivity characteristics taking into consideration the different dimensional restrictions imposed by the desired blade product. A tongue is formed on the adjoining edge surface of the trailing edge core part, and the trailing edge core part is then inserted into a second die and the body core part is formed, including a complementary groove member which is formed around the tongue member on the trailing edge core part. The joined trailing edge and body core parts can then be sintered to form a composite casting core. Blade trailing edge slot thicknesses of about 0.015 inches or less can be achieved.
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Patent Abstracts of Japan, vol. 15, No. 142, Apr. 10, 1991.
Caccavale Charles F.
Carozza Eugene J.
Frank Gregory R.
Robb Ronald R.
Howmet Corporation
Lopez F. Daniel
Sgantzos Mark
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