Investigation on the Deflection Behavior of Cu-10Sn-10Pb Prealloyed Powder Beam

A variant to traditional liquid-phase sintering is to use prealloyed powders, which are heated to a temperature between the liquidus and solidus. The liquid forms inside the particles and spreads to the particle contacts. The liquid volume fraction increases with increase in sintering temperature and time and decreases rigidity of the sample. Beam bending test is the technique for measuring viscosity of the samples. In this paper, measurement of viscosity and its influence on the deflection behavior of LeadBronze pre-alloyed beam in different sintering temperatures was studied. Beam bending analysis is performed at various temperatures and times ranging from 845 to 865 °C. The midpoint deflection was measured by the in situ bending images. The viscosity as a function of the deflection rate, density, span length and height was measured by mathematical relations. It is concluded that increase in liquid volume fraction due to increasing temperature, decreases viscosity and then rigidity of the sample. Finally the deflection of Lead-Bronze beam as a function of time is linear and in the case of temperature is nonlinear and deflection rate increases with increasing time.