Study of Porosity of Sintered Samples of Electroerosive Powder Copper

Purpose of research. Powder copper is widely used in various fields of machine engineering for the production of electrical contact and antifriction products. The quality of sintered products is estimated by density and porosity. One of the main methods for determining the porosity of formed and sintered products is a metallographic method with elements of qualitative and quantitative analysis of pore geometry.

The properties of sintered products made of electroerosive copper powder have not been studied up to the present, which makes it impossible to predict their properties and scope of practical application.

The purpose of the work is to study porosity and pore-size distribution of sintered samples of electroerosive copper powder.

Methods. To perform the planned studies, waste of electrical copper wire (GOST 859-2001) was used. As a working fluid distilled water was used. To obtain a powder of copper a unit to produce powders of conductive materials (patent for invention RF № 2449859) was applied. Dispersion parameters were: voltage 220 V, capacity 45.5 µF, pulse repetition rate 100 Hz.

Isostatic pressing of electroerosive copper powder obtained in water was carried out in isostatic press "EPSI" CIP 400-200*1000Y. The compacted samples were sintered in a high-temperature furnace "Nabertherm" VHT 8/22 in vacuum at a temperature of 900 °C and 1000 °C for 1 hour.

The porosity of the sintered samples of electroerosive copper powder obtained in the water was determined by metallography using optical inverted microscope OLYMPUS GX51 .

Results. Based on the results of the conducted studies, it was experimentally proved that the porosity of a sintered sample of electroerosive copper powder at 900 °C is 5.8 %, the porosity of a sintered sample of electroerosive copper powder at 1000 °C is 2.16 %.

Conclusion. The obtained experimental data can be used to create resource-saving processes for processing metal alloys and composite materials.

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