Fabrication of porous nickel membrane for high precision gas filter

Porous nickel membrane for high precision gas filter was prepared by in-situ reduced/sintered process of NiO with an addition of polymer (PMMA; polymethyl methacrylate). It showed that the porosity of Ni membrane was approximately 52 %. It is similar to metal membrane which prepared using metal fiber as raw materials. The average pore diameter and porosity of Ni membrane increased as content of added polymer and decreased as elevating reduced/sintered temperature from 800 degrees C to 1000 degrees C. Increase of porosity at 800 degrees C was associated with surface diffusion mechanism that leads to initial sintering, while decrease of porosity at 1000 degrees C was associated with lattice diffusion and grain boundary diffusion.