An improved wax-based multi-component binder and a new debinding method termed high-pressure condensed solvent extraction were developed for powder injection molding of tungsten cemented carbide. The results indicate that a critical powder loading of 65% (volume fraction) and an ideal rheological properties were obtained by the feedstock based on the binder. High debinding rate and specimens with high strength were obtained by the debinding method. Moreover, by making high temperature holding time adjustable, it makes the subsequent thermal degradation process more flexible to debinding atmosphere and carbon content of the as debinded specimens controllable. The transverse rupture strength, hardness and density of the as-sintered specimens made by an optimized PIM process are 2.48GPa, HRA90 and 14.72g/cm3, respectively. Good shape retention and about 0.02% dimension deviation were achieved.

The invention relates to a binder for injection molding of titanium alloy powder and a method for injection molding of titanium alloy parts, belonging to the technical field of titanium alloy parts processing. The binder is composed of polypropylene, low density polyethylene, paraffin, stearic acid and naphthalene.

The method is as follows: the spherical powder of titanium alloy is put into the mixer for heat preservation and preheating, polypropylene and low density polyethylene are put in; The temperature was lowered to 50 degrees for heat preservation, component B was added, the rotating speed was adjusted for mixing, and the temperature was lowered to toothpaste shape for extrusion granulation. Then, injection molding, degreasing, vacuum sintering and furnace cooling were carried out successively to obtain titanium alloy parts. The advantages of the invention is: the existing basic load between 55% ~ 65%, the invention adopts a load of 68%, reduce the proportion of the binder, can say, in the process of feeding with high loading capacity also can guarantee the mixture has good rheological properties, filling, easy to get green for mold shape, and no defects.

Related link:

http://www.wococarbide.com/Transaction/en_information.html

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