Core material and method of forming cores

Details Core material and method of forming cores Core material and method of forming cores

1984-05-17

1986-04-22

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

164519, 164369, 106 389, B22C 102

Patent

active

045835810

ABSTRACT:
An improved core material is used in an improved method of forming cores for investment casting of articles. The core material comprises fused silica, synthetic amorphous silica, a refractory material, and a binder. The synthetic amorphous silica has a surface area of at least 200 square meters per gram. Even though the synthetic amorphous silica has a relatively large surface area, it has a particle size of less than 10 microns and is 5% or less by weight of the total weight of the solid constituents of the core material slurry. After a green core has been formed in a core mold it is fired to set the core material. During firing, the green core shrinks in size. To compensate for deviations in the size of a finished core from a desired size, the percentage of synthetic amorphous silica in the core material slurry is varied.

REFERENCES:
patent: 4093017 (1978-06-01), Miller, Jr. et al.
patent: 4128431 (1978-12-01), Svec
patent: 4188450 (1980-02-01), Greskovich
patent: 4190450 (1980-02-01), Robb et al.
patent: 4236568 (1980-12-01), Larson

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