International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Information is provided on the critical values of the ratio of the thickness of a filter element in the shape of a pipe to the radius of a cylindrical surface when it is manufactured by rolling a porous sheet blank sintered from tin-phosphorous bronze powder. An increase in the efficiency of using filter elements obtained in this way has been shown. Images of some of the developed filter products introduced into production are presented.

The article presents information on the regeneration of filter elements (filter components) made of tin-phosphorus bronze powders that were tested during polyethylene production in the unloading unit of the ethylene polymerization reactor for cleaning hydrocarbon compounds from polyethylene powder particles. It was found that during the testing period, the filter elements met the requirements specified in the equipment regulatory documents. After completing the tests, two thermal regeneration cycles were carried out: at LLC “Stavrolen” and at O.V. Roman Powder Metallurgy Institute. It was found that in the first case, the filter element throughput was restored to 67.5% of the initial value, and in the second case, to 97.2%, which indicates the multiple regeneration possibility of spent powder filter elements when used to clean hydrocarbon compounds from polyethylene powder particles.

The results of comparative studies of the structure and properties of two-layer filter materials based on finely dispersed nickel powder are presented, in which the substrates were formed using hollow spheres and carbamide as pore-forming agents. The properties of the layers forming the structures of these two-layer materials, as well as the composite biporous material properties consisting of a mixture of hollow spheres of finely dispersed nickel powder and finely dispersed nickel powder are studied. The prospects for using hollow spheres to create two-layer filter materials are shown.

The possibility of using hollow spheres to create highly porous materials (HPM) based on fine powders is shown. In the process of obtaining HPM, fine powder acts as a matrix, hollow spheres are used as a pore-forming agent. At the same time, in the initial state, hollow spheres are formed in the form of bead-shaped polystyrene granules (PSG) with a coated shell of fine aluminum oxide powder, followed by the removal of PSG during sintering. The shell prevents the integration of spherical voids into a single system of large pores, providing high purification fineness. It is confirmed that this technology provides an increase in throughput at a given fineness of purification.

A method for determining the local permeability of powder filtering materials (PFM) based on the measurement of gas-flows sequentially passing through the measuring head and different areas of the measured object (sample, product), and a device for its implementation are described. The device is characterised by simplicity of execution and can be used both in laboratory and production conditions. By the average value of localised flow rates the throughput capacity of the whole product can be estimated.

The process of obtaining bronze powders of grade BrSn5Zn5Pb5, obtained by the method of induction melting and spraying of the metal melt with an inert gas, has been studied. It is known that in the production of BrSn5Tsn5Pb5 powder, the main losses of zinc occur during the melting of the components. To study the possibility of reducing zinc losses in the melt, a zinc-containing composite alloying material has been developed. Its effect on the chemical composition of BrSn5Zn5Pb5 powders obtained by induction melting and spraying the melt with an inert gas has been studied.

In the paper consider materials for the rapid prototyping (RP) of experimental samples of filtering materials with an orthotropic structure based on woven nets (FMWN) assembled together with test-form and with using of 3D printing. RP made it possible to reduce the labor intensity of the process, primarily by eliminating the operation of sealing samples when using a traditional test form, as well as making the test form and the samples themselves. The data obtained allowed us to conclude that the use of 3D-printing is promising in further work for the manufacture of test form for studying the properties of filtering materials.

Information on a small-size installation for production of atomized powders of copper-based alloys is presented. The process of obtaining pulverized powders of BrSn10Ph1 and BrSn5Zn5Pb5 grades by induction melting and melt gas atomization, intended for hardening of new and restoration of worn surfaces by gas-flame coating, as well as protection against corrosion of parts is studied. The quality of the coatings obtained using the manufactured powders has been confirmed