Metal founding – Means to shape metallic material – United particle type shaping surface
Patent
1989-03-06
1989-09-19
Godici, Nicholas P.
Metal founding
Means to shape metallic material
United particle type shaping surface
164 72, 164113, 164138, 164527, 427134, 523139, 523148, B22C 300, B22C 122, B22C 910
Patent
active
048672254
ABSTRACT:
The coatings are for an expendable sand core for die casting dies, which sand core has spaces between its contacting sand grains at least partially filled with resin binder. The first, base, hard, or refractory coating for this core is applied from an aqueous suspension comprising a finely ground refractory of fused silica, a refractory binder, and at least two different compounds selected from the groups of compounds or additives consisting of: (1) a suspension agent, (2) a dispersant, (3) a wetting agent, and (4) an anti-skinning agent. The refractory in the first coating may also include a minor amount, i.e. less than 50%, of another refractory oxide. The amount of binder in the first coating is less than about 15% by weight of the total liquid suspension, and the amount of additives is less than about 1.5% and usually less than 1% by weight of the total liquid suspension. The second, top, soft, or release coating is an organic liquid suspension containing between about 5% and 60% by weight of the whole suspension of particles of a release material selected from the group consisting of anhydrous powdered aluminum, graphite, talc, titanium dioxide, and zircon, and less than about 10% by weight of the total suspension of a resinous binder, less than 15% of at least two additives or different compounds selected from the groups additives and compounds consisting of a suspension agent, a dispersant, and an anti-setting agent.
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Batten, Jr. J. Reed
Farley, Inc.
Godici Nicholas P.
Kirk Hugh Adam
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