One of the basic problems in sintering process of brass powder metallurgy components is the evaporationof zinc.In order to preserve the Zn content inexpensive experiments and methodshave been employed. In the current study, zinc lossis prevented and precipitation of zinc is achieved by formation of ZnO nanoparticles.Under Argon and Nitrogen atmosphere, the zinc vapor was grown in ZnO format on the copper heterogeneous catalyst.The catalyst is less oxidized due to zinc oxidation in the boundary layer of Zn-Cu powder particles. Zinc vapor exits more quickly from the powder sample than pressed sample and nanoparticles of ZnO are formed in a short time. It is evident that zinc evaporation is tougher from a more homogeneous and pressed sample, due to closure of gas exit path. To explore the mentioned matter, a pressed sample containing a groove was subjected to similar experiment conditions. It was observed that the nanoparticles which were formed on the grooved pressed sample are more than those formed from not grooved sample and less from powdered sample.While thecontrolling mechanism of the evaporation is diffusion, boundary layer is the controlling mechanismof the formation of zinc oxide nanoparticles.Moreover, the X-Ray diffraction pattern and Scanning Electron Microscopy results depict [101] as the preferable growth orientation of zinc oxide nanoparticles.