Method of forming a cast metal article

Details Method of forming a cast metal article Method of forming a cast metal article

2011-03-15

2011-03-15

Lin, Kuang (Department: 1735)

Metal founding

Process

Shaping a forming surface

C164S519000, C164S369000

Reexamination Certificate

active

07905273

ABSTRACT:
An unfired ceramic base core having a first coefficient of thermal expansion is provided. A core element having a second coefficient of thermal expansion is positioned in an opening formed in the unfired ceramic base core. The opening in the unfired ceramic base core is filled with a filler material having a third coefficient of thermal expansion. The third coefficient of thermal expansion is greater than the first coefficient of thermal expansion and less than the second coefficient of thermal expansion. The ceramic base core is fired without cracking the base core and without cracking the filler material. The ceramic base core contains silica and zircon and has a silica content of 70% or less and a zircon content of 30% or more. The core element may be formed of a ceramic material or a refractory metal.

REFERENCES:
patent: 5580837 (1996-12-01), Dodds et al.
patent: 6637500 (2003-10-01), Shah et al.
patent: 6929054 (2005-08-01), Beals et al.
patent: 2006/0086479 (2006-04-01), Parkos et al.
patent: 2007/0116972 (2007-05-01), Persky

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