Comparing In-Situ Deflection Behavior during Sintering of Alloyed Powder Compact Beams of Cu28Zn and Cu10Sn10Pb

摘要

According to the phase diagram, liquid phase content increases with increasing temperature andcauses viscosity reduction of the material. Under the effect of gravitational force, this decrease willresult in beam bending. It can be assumed that chemical composition is a key factor, playing animportant role in in-situ mechanical properties such as deflection behavior. In order to investigate thisfeature, powders of Cu-28Zn containing a volatile element (Zinc) and Cu-10Sn-10Pb without that,were compacted at 600 MPa and sintered in the range of 910 to 930 ℃ and 845 to 865 ℃,respectively, and their isothermal time range was 0 to 90 min. The midpoint deflection of brass beamsas a function of time is nonlinear, while about bronze it is linear. Zinc evaporation is the main reasonfor this different behavior. Moreover, this phenomenon may directly affect the other sinteringprocesses like densification and pore size.