Removing lost foam pattern coating residue from a casting

Details Removing lost foam pattern coating residue from a casting Removing lost foam pattern coating residue from a casting

2005-06-07

2005-06-07

Lin, Kuang Y. (Department: 1725)

Metal founding

Process

Shaping a forming surface

C164S072000, C164S131000

Reexamination Certificate

active

06901989

ABSTRACT:
In the lost foam casting of aluminum, coating a fugitive pattern with a refractory coating containing a thermally stable, water-insoluble, acid-gasifiable (e.g. CaCO3) compound, and contacting the casting, with the coating thereon, with an acid to dissociate and gasify the compound and rupture the coating. Preferably, any thermal degradation products from the pattern residing in the coating are neutralized to promote wetting of the coating.

REFERENCES:
patent: 4281705 (1981-08-01), Jeney
patent: 4448235 (1984-05-01), Biship
patent: 4482000 (1984-11-01), Reuter
patent: 5387280 (1995-02-01), Kennerknecht
patent: 53-65221 (1978-06-01), None
patent: 63290647 (1988-11-01), None
patent: 5-104.198 (1993-04-01), None

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