Porosity Anisotropy of Sintered Sample Obtained by Pressure Moulding of Sponge Titanium Powder with Steel Punch with Elastic Lining

摘要

One of the objectives of porous powder materials (PPM) research for the majority of authors is getting their anisotropic structure in the direction of gas or liquid flow and thereby increasing the permeability of PPM, while keeping the average pore size due to such structure. In this paper we investigate the effect of increasing the surface layer porosity of PPM samples obtained by pressure moulding of sponge titanium powder with steel punch with elastic lining. Measurement of the porosity using PPM sample thickness was performed by the stereometric quantitative metallography method (method of parallel secants) from the surface in contact with the formative tool to a depth of 2.0 mm from this surface with an interval of 0.1 mm. The depth at which this effect is most pronounced (up to 0.8 -1.0 particle diameter) has been established, as well as the specific values of porosity in the PPM at this depth.