Patent ID: 6113829
Filing Date: 2000-09-05
Classification: B28B,C04B

Abstract:
A method for forming and shaping powder mixtures, the method comprising:a) compounding, homogenizing, and plasticizing components to form a mixture, the components comprising powder materials, binder, aqueous based solvent for the binder, surfactant, and non-solvent with respect to at least the binder, the solvent, and the powder materials, wherein the non-solvent is lower in viscosity than the binder combined with the solvent,the components being chosen to result in improved stiffness in the subsequently formed mixture and green body, the compounding being done by the steps ofi) dry-mixing the powder material, surfactant and binder to form a uniform blend thereof,ii) adding the solvent to the resulting dry blend, and thereafteriii) adding the non-solvent to the blend resulting from step ii; andb) shaping the mixture resulting from step a by passing the mixture through a low to moderate shear extruder, and then through a die to form a green body,wherein steps a and b are carried out at a temperature of no greater than ambient temperature.