Characteristics of rapidly solidified Cu-10%Sn alloy powders produced by water jet cooled rotating disc atomisation

摘要

In the present work, an experimental water jet cooled rotating disc centrifugal atomiser was designed and constructed and used to produce rapidly solidified Cu-10%Sn alloy powders. The characteristics of rapidly solidified Cu-10%Sn alloy powders have been investigated with respect to powder size and disc surface condition. Uncoated and ZrO_2 coated copper discs were used to investigate the effect of disc surface conditions on the microstructure and cooling rate of the powders. The produced powders appeared in the shape of sphere, rounded, ligament, irregular and flaky, depending on the particle size. The powders exhibited fine grained microstructure, cell size increased with increasing powder size and higher cooling rates were obtained using uncoated disc. The results indicated that cooling rates of 20 μm powder produced with uncoated and ZrO_2 material coated discs were estimated as 5.82 × 10~5 and 1.44 × 10~5 K s~(-1) respectively.