Method and binder for use in powder molding

Details Method and binder for use in powder molding Method and binder for use in powder molding

1992-12-17

1994-07-26

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 25, 264 63, 264344, 419 36, 419 37, C04B 3804

Patent

active

053325370

ABSTRACT:
An improved binder is mixed with powder to form feedstock for molding. The binder includes a first component which is soluble in water and a second component which is insoluble in water. The two binder components are miscible with each other in a liquid state. The two binder components form a uniform heterogeneous mixture when mixed in a liquid state. The binder is mixed with a suitable powder to form the feedstock. The feedstock is molded to form a compact. Polymer units of the binder are cross linked after the compact has been formed. The cross linking of the polymer units of a component of the binder is accomplished by exposing the compact to ultraviolet radiation or by the use of a catalyst. The compact is partially debound by exposing the compact to water, that is, to a water based solvent. Thereafter, the compact is further debound to remove the component which is insoluble in water. The powder is then sintered to form an article.

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A New Water Soluble Solid Polymer Solution Binder For Powder Injection Molding, M. Y. Cao, J. W. O'Connor and C. I. Chung Material Engineering Department; Rensselaer Polytechnic Institute Troy, N.Y. Publication date unknown.

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