Patent ID: 6624225
Filing Date: 2003-09-23
Classification: B22F,B23K,B23P,C08K,C08L,C09D,C09J

Abstract:
A moldable composition comprising:a first part comprising a mixture of: 1) 85-95% of a first metal or alloy powder; and 2) 5-15% of a first sacrificial binder consisting essentially of: a) 25-50% of a first thermoplastic resin having a glass transition temperature of below 20Â° C.; b) 25-60% of a first solvent for the first thermoplastic resin which vaporizes at temperatures up to 200Â° C. and has a vapor pressure of less than 20 mm Hg at 20Â° C., the first solvent being selected from the group consisting of VM&P naptha, a mineral spirit, a glycol ether or a glycol ether acetate; c) 0-30% of a first plasticizer; and d) 0-5% of a first wetting agent; and a second part comprising a mixture of: 1) 85-95% of a second metal or alloy powder, wherein the second metal or alloy powder has a liquidus temperature lower than the solidus temperature of the first metal or alloy powder; and 2) 5-15% of a second sacrificial binder consisting essentially of: a) 25-50% of a second thermoplastic resin having a glass transition temperature of below 20Â° C.; b) 25-60% of a second solvent for the second thermoplastic resin which vaporizes at temperatures up to 200Â° C. and has a vapor pressure of less than 20 mm Hg at 20Â° C., the second solvent being selected from the group consisting of VM&P naptha, a mineral spirit, a glycol ether or a glycol ether acetate; c) 0-30% of a second plasticizer; and d) 0-5% of a second wetting agent wherein the second part is disposed on the first part.