Powder injection molding feedstock

Abstract

A powder injection molding feedstock includes powder particles, a main binder, and a secondary binder. A glass-transition temperature of the secondary binder is greater than a glass-transition temperature of the main binder, the secondary binder coats the powder particles, and the main binder coats the secondary binder and the powder particles.

What is claimed is: 
     
         1 . A powder injection molding feedstock comprising:
 powder particles;   a main binder; and   a secondary binder;   wherein a glass-transition temperature of the secondary binder is greater than a glass-transition temperature of the main binder, the secondary binder coats the powder particles, and the main binder coats the secondary binder and the powder particles.   
     
     
         2 . The powder injection molding feedstock of  claim 1 , wherein the powder particles have a volume percentage of about 55% to about 70% of a total volume of the powder injection molding feedstock. 
     
     
         3 . The powder injection molding feedstock of  claim 1 , wherein the secondary binder and the main binder have a volume percentage of about 30% to about 45% of a total volume of the powder injection molding feedstock. 
     
     
         4 . The powder injection molding feedstock of  claim 3 , wherein the secondary binder has a volume percentage of about 5% to about 20% of a total volume of the secondary binder and the main binder. 
     
     
         5 . The powder injection molding feedstock of  claim 1 , wherein the powder particles are metal powders or ceramic powders. 
     
     
         6 . The powder injection molding feedstock of  claim 1 , wherein the powder particles have particle sizes at a micrometer range. 
     
     
         7 . The powder injection molding feedstock of  claim 1 , wherein the secondary binder is polymethyl methacrylate or polycarbonate. 
     
     
         8 . The powder injection molding feedstock of  claim 1 , wherein the main binder is plastic-base binder or wax-base binder. 
     
     
         9 . The powder injection molding feedstock of  claim 1 , further comprising an auxiliary agent dispersed in the main binder. 
     
     
         10 . The powder injection molding feedstock of  claim 9 , wherein the auxiliary agent is flow modifier, compatibility agent, or any combination thereof.