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传统粉末冶金工艺难以消除整个制品的密度梯度.常规制品很少有长径比大干2的情况;另外,也不适于生产带有侧孔和小芯孔的部件。在用传统方法生产的零件中,芯棒成形孔仅限于压制方向,横向芯棒成形小孔影响装粉和成形过程粉末的流动。本发明提供了一种生产适于烧结而不起泡和开裂、长径比大于2的制品的方法;提供了一个利用注射过程中能流动,但加热时粘度增大的塑性介质
Conventional powder metallurgy process is difficult to eliminate the density gradient of the entire product. Conventional products rarely have the aspect ratio 2; In addition, it is not suitable for the production of parts with side holes and small core holes. In the parts produced by the conventional method, the mandrel forming holes are restricted to the pressing direction, and the transverse mandrel forming holes affect the powder flow in the powder filling and forming processes. The present invention provides a method of producing an article suitable for sintering without blistering and cracking with an aspect ratio of greater than 2; a method of using a plastic medium that is flowable during injection but increases in viscosity upon heating;