Abstract
In the fields of an eco-friendly automobile, an advanced industrial machine, and a precision electronic device, controlling of vibration damping behavior of the sintering parts obtained from powder metallurgy is required. In this paper, the vibration behavior of Cu-Sn/Al2O3 composite material made by powder metallurgy was investigated by a FFT analyzer.
Cu, Sn, and Al2O3 powders were used as initial substances. The powders were mixed and pressed into a plate shaped compact with 200 MPa. Using a vacuum furnace, the green compact was sintered at 825-1075 °C for 1 hour. By changing the mixing ratio and the sintering temperature, some kinds of the composite material plates were produced. For the composite material obtained, microstructure observation, Vickers hardness test, compression test and vibration test were performed.
The composite materials were consisted from the crystal grain of 15-69 μm, and the mixed Al2O3 particles were dispersed on the grain boundary. Additionally, twin crystal was also found in the composite materials. The damping coefficient of composite material depended on the mixing ratio of the raw powders and the sintering microstructure. The vibration damping behavior of the Cu-Sn/Al2O3 composite material was affected by solubility element, grain boundary, dispersoid particle, and twin crystal.
