Obtaining of Porous Powder Materials by Radial Pressing Method

Technology Obtaining of Highly Efficient Powdered Filtering Materials for Cleaning Liquids and Gases

“…The absence of contact friction between the powder and the elastic shell ensures the uniform distribution of the density by the volume of powder briquette, which ensures after the sintering the required quality of the finished product. Therefore, it is advisable to use the radial compression scheme as a basis for the creation of new technologies of FM forming, since it allows to realize the basic positive features inherent in traditional methods of pressing and also allows receiving various gradient filtering materials in which pore sizes decrease in the direction of filtration [5].…”

“…Also, we consider is promising direction, the creation of FM based on titanium carbidea material with a high melting point (3260150 о С), hardness, thermal conductivity, resistance to aggressive environments and abrasive deterioration. It possesses high corrosion resistance both in alkaline and in acidic environments, as well as oxidation resistance [1], [5].…”

“…Promising and widespread products with a heterogeneous porous structure are multilayer FM, in which each layer is made of powders of different granulometric composition. Such materials have a permeability, pollutant capacity and service life higher than single-layer [5]. The development of the technology of a step-by-step multilayer DRIP from various by nature sealing materials, will allow producing of high-performance FM of new generation with unique properties.…”

“…After mixing the titanium and carbon powders, on the vibration stand we filled the resulting powders mixture into a form to provide a uniform bulk density along the length (volume) of the product. After filling was performed the DRIP process using the tools and equipment described in [5] to provide the required geometry and the density of the powdered briquette. In order to change the pore size of the filtering material, is possible introducing the filler into the powders mixture (e.g.…”

“…In last one is observed the formation of titanium oxinitrides on the outer and inner surfaces of the product. The penetrability by thickness of FM from a pure Ti is variable, the inner area is partially melted, while observed a closure of pores, which significantly reduces its performance characteristics [1], [5]. According to our observations, this is directly related with the SHS-sintering processes of a powders mixture (Ti+C = TiC 0.5 ), which resulted to an increase the average pore sizes of FM obtained by us, which is d ср (TiC 0.5 )=1215 microns in comparison with similar FM whose average pore size does not exceed d ср (Ti)=(68) μm.…”