Abstract
ABSTRACT
In the fields of an eco-friendly automobile, an advanced industrial machine, and a precision electronic device, controlling of vibrational behavior of the sintering parts obtained from powder metallurgy is required. In this paper, the vibration behavior of porous material made by powder metallurgy is investigated by a FFT analyzer. Pure Cu powders (Average particle size: 36 µm, 89 µm) are used as initial substances. The powder is compressed by a metal die with 100～200 MPa, and a plate shaped Cu compact is made. Using a high vacuum furnace, the green compact is heated from room temperature with 10 ˚C/min, and is sintered at 700～1000 ˚C for 1 hour. By changing the powder particle size, the compaction pressure, and the sintering temperature, some kinds of sintered Cu porous plates which had various microstructures, varied porosity, and different mechanical properties are sintered. For the sintered Cu porous plate obtained, microstructure observation, tensile test and vibration test are performed.
The vibration behavior of the sintered Cu porous plates is analyzed from the frequency response function of the FFT analyzer. The damping coefficient of the sintered Cu porous plate depends on the porosity and the open pore ratio. The vibrational behavior of the sintered material is able to be easily measured by FFT analyzer.
