公开(公告)号：DE69811381D1

公开(公告)日：2003-03-20

申请号：DE69811381

申请日：1998-08-05

Applicant: CORNING INC

Inventor： BOOKBINDER W ,  CHALASANI DEVI ,  DILLON P ,  MCCARTHY R ,  STUTTS E ,  ZAK E

IPC: B28B3/20 ,  B28C7/00 ,  C04B35/195 ,  C04B35/622 ,  C04B35/632 ,  C04B35/636 ,  C04B38/00

Abstract: A method for forming and shaping powder mixtures involves compounding, homogenizing, and plasticizing components to form a mixture. The components are powder materials, binder, solvent for the binder, surfactant, and non-solvent with respect to at least the binder, the solvent, and the powder materials. The non-solvent is lower in viscosity than the binder combined with the solvent. The components are chosen to result in improved wet green strength in the subsequently formed green body. The compounding is done by the steps of dry-mixing the powder material, surfactant and binder to form a uniform blend, adding the solvent to the resulting dry blend, and thereafter adding the non-solvent to the blend. The mixture is shaped by passing it through a low to moderate shear extruder, and then through a die to form a green body. The compounding and shaping steps are carried out at a temperature of no greater than ambient temperature. The method is especially suitable for RAM extrusion. Among the advantages, the method results in higher extrusion velocity, throughputs, and wet green strength, without increasing pressures and torques.

公开(公告)号：DE69818845T2

公开(公告)日：2004-08-19

申请号：DE69818845

申请日：1998-07-23

Applicant: CORNING INC

Inventor： CHALASANI DEVI ,  FISCHER MICHAEL ,  MALARKEY J ,  MCCARTHY R ,  STUTTS E ,  ZAK E

IPC: B28B3/20 ,  C04B35/195 ,  C04B35/622 ,  C04B35/632 ,  C04B35/636 ,  C04B38/00

Abstract: Powder mixtures and a method of forming and shaping the mixtures. The method involves compounding the components of powder materials, binder, solvent for the binder, surfactant, and non-solvent with respect to at least the binder, the solvent, and the powder materials. The non-solvent is lower in viscosity than the binder combined with the solvent. The solvent is present in an amount that is less than the amount that would be present otherwise. The components are mixed and plasticized, and shaped to form a green body. The choice of components results in improved wet green strength in the green body. The method is especially useful for extrusion processing of aqueous binder systems such as water and cellulose ethers and hydrophobic non-solvents, to form structures such as honeycombs. In the body, the ratio, upon subsequent firing, of the isostatic strength to the A-axis strength is at least about 20 % higher than in bodies made without the mixture composition of the invention. A honeycomb body having a ratio of the isostatic strength to the A-axis strength of at least about 0.33 upon firing.

公开(公告)号：DE69818845D1

公开(公告)日：2003-11-13

申请号：DE69818845

申请日：1998-07-23

Applicant: CORNING INC

Inventor： CHALASANI DEVI ,  FISCHER MICHAEL ,  MALARKEY J ,  MCCARTHY R ,  STUTTS E ,  ZAK E

IPC: B28B3/20 ,  C04B35/195 ,  C04B35/622 ,  C04B35/632 ,  C04B35/636 ,  C04B38/00

Abstract: Powder mixtures and a method of forming and shaping the mixtures. The method involves compounding the components of powder materials, binder, solvent for the binder, surfactant, and non-solvent with respect to at least the binder, the solvent, and the powder materials. The non-solvent is lower in viscosity than the binder combined with the solvent. The solvent is present in an amount that is less than the amount that would be present otherwise. The components are mixed and plasticized, and shaped to form a green body. The choice of components results in improved wet green strength in the green body. The method is especially useful for extrusion processing of aqueous binder systems such as water and cellulose ethers and hydrophobic non-solvents, to form structures such as honeycombs. In the body, the ratio, upon subsequent firing, of the isostatic strength to the A-axis strength is at least about 20 % higher than in bodies made without the mixture composition of the invention. A honeycomb body having a ratio of the isostatic strength to the A-axis strength of at least about 0.33 upon firing.