Influence of powder mixture components particle size ratio on cold-pressed Cu—20% (wt) W materials structure


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #18


Processes of structure formation of copper-tungsten powder compositions has been studied from the standpoint of physical-mechanical properties optimization for practical application. Influence of powder particle size ratio of matrix and inclusions components R(Cu)/R(W) at fixed tungsten content in the starting mixture on structure and physical-mechanical properties of cold-pressed Cu—20% (wt) W materials. Characteristic porosity formation mechanism for the investigated materials has been established showing that the porosity is partly formed due to tungsten particles elastic deformation during cold pressing. It has been shown that Cu—20% (wt) W cold pressed material structure is isotropic independent of R(Cu)/R(W) ratio values. Moreover, the strength of the material with the increase of this ratio is also increasing. Elastic modulus correlates with the specific resistance of the materials. The R(Cu)/R(W) = 10 value is recommended for the investigated cold-pressed material for the highest efficiency of its use for cumulative charge components production. Full text download