Abstract
In order to obtain a high frictional and good wear resistance surface, the superplastically embedding process of SiC powder into Zn-Al eutectoid alloy plates was developed. The embedding mechanism was investigated using the experimental simulation. The upper surface of a Zn-21.5%Al-0.5%Cu-0.01%Mg alloy (SPZ) specimen of the size 13×13×3mm was covered with SiC powder classified into +150, +250 and +355μm in size, with the density of 0.08-0.15mg•mm-2, and then forged superplastically at the punch speed of 1.7×10-3 to 1.7×10-1mm•s-1 at the temperature range of 473 to 523K. The embedding mechanism of SiC powder into SPZ specimen was analyzed using a glass-ceramics sphere of 6.0mm in diameter. The projection height and embedding efficiency depended on the applied stress ratio of SiC powder to the yield stress of SPZ.
