Powder metallurgy injection molding process
of metal powder particle size is generally in 0.5~20 mu m; theoretically
speaking, the smaller the particle size, the larger the surface area, easy
forming and sintering. The traditional powder metallurgy process uses more than
40 m of coarse powder. The role of organic adhesive is to bond metal powder
particles, so that the mixture in the jet barrel heating with rheological
properties and lubrication, that is, to drive the flow of powder carrier.
Therefore, the choice of adhesive is the carrier of the whole powder.
Requirement of powder metallurgy injection
molding process for organic binder:
1 less dosage, with less adhesive agent can
make better rheological properties of the mixture;
2 does not react, in the process of
removing the adhesive and metal powder can not afford any chemical reaction;
3 easy to remove, no residual carbon in the
inner. Mixing metal powder with organic binder mixed together, so that a
variety of raw materials into a mixture of spray forming. The uniformity of the
mixture has a direct impact on its mobility, which influences the spray forming
process parameters, as well as the density and other properties of the final
materials. The process of spray forming is consistent with the principle of
plastic injection molding process, and the equipment condition is basically the
same.
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