2002 Volume 49 Issue 9 Pages 759-764
The three manufacture engineerings on copper and copper based alloyed powders for powder metallurgy have been developed. The powders manufactured by these methods were as follows.
1) The partially alloyed copper powder can be manufactured by only the simple heat treatment after mixing. And this powder has the properties as nearly good in compactibility and sinterability as mixed powders and less in segregation.
2) By applying the stable condition of the water jet, Cu-Sn, Cu-Zn, Cu-Co and Cu-Sn-Pb-Zn alloys were atomized and the obtained powders have compactibility of 1.5-2.0 times higher than that of powders produced under the conventional condition.
3) The spherical finer powder was manufactured by the newly developed high-pressure water atomization method using swirl water jet. Cu-Sn alloy was atomized by this method. The median diameter of this powder decreased from 12.5μm to 7.5μm with increasing swirl degree.
