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AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
InventorJean-Pierre Flochel
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A thermoplastic paste for the production of foundry mold cores comprises, per 100 parts by weight of mineral filler comprised of fused silica, zircon and cristobalite, between 0.2 and 0.5 parts by weight of a mold release agent, and an organic binder formed by at least 15 to 20 parts by weight of polyethylene glycol having an average molecular weight between 1400 and 1600. A process suitable for the production of foundry mold cores from such a past comprises a shaping stage followed by a single firing cycle in four steps, namely, (a) raising the temperature to 500.degree. C., at a rate of between 30.degree. C. and 50.degree. C. per hour. (b) raising the temperature from 500.degree. C. to a maximum temperature, at a rate of between 100.degree. C. and 200.degree. C. per hour. (c) maintaining the said maximum temperature for a period of between 4 and 5 hours, and (d) cooling rapidly using pulsed air.
A thermoplastic paste for the production of foundry mold cores, comprising a mineral filler composed of, by weight, from 60% to 85% fused silica, from 15% to 35% zircon, and from 1% to 5% cristobalite, said paste also comprising, per 100 parts by weight of said mineral filler, from 0.2 to 0.5 parts by weight of a mold release agent, and from at least 15 to 20 parts by weight of an organic binder formed by a polyethylene glycol having a molecular weight between 1400 and 1600.
A thermoplastic paste for the production of foundry mold cores, comprising a mineral filler composed of, by weight, 77% fused silica of granulometry of less than 63 .mu.m, 20% zircon in the form of a flour of granulometry of less than 50 .mu.m, and 3% cristobalite, said paste also comprising, per 100 parts by weight of said mineral filler, 0.5 parts by weight of calcium stearate, 18 parts by weight of polyethylene glycol having an average molecular weight of 1550, and 4.5 parts by weight of cetyl alcohol.
A thermoplastic paste for the production of foundry mold cores, comprising a mineral filler, composed of, by weight, 77% fused silica of granulometry of less than 63 .mu.m, 20% zircon in the form of a flour of granulometry of less than 50 .mu.m, and 3% cristobalite of granulometry from 2 to 5 micrometers, said paste also comprising, per 100 parts by weight of said mineral filler, 0.5 parts by weight of calcium stearate, 20 parts by weight of polyethylene glycol having an average molecular weight of 1550, and 4.5 parts by weight of cetyl alcohol.
A thermoplastic paste for the production of foundry mold cores, comprising a mineral filler, composed of, by weight 77% fused silica of granulometry of less than 50 .mu.m, 20% zircon in the form of a flour of granulometry of less than 50 .mu.m, and 3% cristobalite, said paste also comprising, per 100 parts by weight of said mineral filler, 0.5 parts by weight of calcium stearate, 17 parts by weight of polyethylene glycol having an average molecular weight of 1550, and 4.5 parts by weight of cetyl alcohol.
A thermoplastic paste for the production of foundry mold cores, comprising a mineral filler, composed of, by weight, 60% fused silica of granulometry of less than 100 .mu.m, 17% fused silica of granulometry of less than 50 .mu.m, 20% zircon in the form of a flour of granulometry from 0 to 50 .mu.m, and 3% cristobalite, said paste also comprising, per 100 parts by weight of said mineral filler, 0.5 parts by weight of calcium stearate, 17 parts by weight of polyethylene glycol having an average molecular weight of 1550, and 4.5 parts by weight of cetyl alcohol.
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