The MIM technology is an alternative process for fabricating near net shape components that usually uses gas atomised powders with small size (< 20 μm) and spherical shape. In this work, the possibility of changing partially or totally spherical powder by an irregular and/or coarse one that is cheaper than the former was investigated. In this way, different bronze 90/10 components were fabricated by mixing three different types of powder, gas and water atomised with different particle sizes, in order to evaluate how the particle shape and size affect the MIM process.

Small powder size is very useful in achieving detailed structures. STS 316 nanopowders with an average diameter of 100 nm and were utilized to produce feedstock. The mixing behavior of the feedstock indicated that the nanoparticle feedstock produced the highest mixing torque at various powder loading compared to the micropowder feedstock. The nanoparticles feedstocks showed that elastic properties are dominant in flow behavior and high viscosity. Conversely the micropowders feedstocks, viscous properties are dominant in flow behavior and less viscosity, nanopowders feedstock perform lower flow activation energy than feedstock with bigger particles.

This study has been carried out to investigate Electrostatic Precipitator`s(ESP) performance enhancement and removal efficiency of fine particle according to (NH_4)_2SO_4 injection rate. The following conclusions are derived from the these test results : 1)For plant condition cases, according to the variation of concentration agent [(NH_4)_2SO_4] - 10ppm, 20ppm, 30ppm, 40ppm - ESP`s collection efficiency was increased to 97.74%, 98.95%, 99.04%, 99.47%, when inlet dust loading was 2g/㎥. And when inlet dust loading was 3g/㎥, that was increased to 98.19%, 99.16%, 99.23%, 99.58%. 2)It is seen from this experiments that the increasing 30ppm concentration of (NH_4)_2SO_4 increase the collection efficiency and fine particle emission control.