Abstract
The high cost of metal powder materials and the energy consumption of the methods involved in their production have led to an increase in the cost of technologies for the restoration and hardening of parts. One method of solving this problem is the recycling of powders. A promising method for processing the waste from machine-building industries, including those utilizing non-ferrous metals and alloys, is electroerosive dispersion. Metallic powders from secondary raw materials obtained in this manner have good physical and mechanical properties, and their cost is two to three times less than the cost of industrial ones. However, the tribotechnical properties of the secondary powders of non-ferrous metals and their use in technologies for the restoration and hardening of parts are still poorly understood. This paper presents a comparative analysis of the tribotechnical properties of coatings obtained via an electric spark treatment with electrodes composed of bronze CuAl9Fe3 (CuAl8Fe3) (in the state of delivery), and coatings of sintered secondary bronze obtained via the method of electroerosive dispersion followed by spark plasma sintering. The results of the comparative tribotechnical tests under the conditions of dry friction showed that the complex indicator of wear resistance—the wear factor (F)—under dry friction conditions, for mates after an electrospark coating method with sintered secondary bronze, was 1.94 less than for mates with a CuAl9Fe3 (CuAl8Fe3) coating. This confirmed the high tribotechnical properties and the effectiveness of using cheap secondary bronze in repair production in technologies for restoring and strengthening worn parts of machines operating under dry friction conditions.
Highlights
This paper presents a comparative analysis of the tribotechnical properties of coatings obtained via an electric spark treatment with electrodes composed of bronze CuAl9Fe3 (CuAl8Fe3), and coatings of sintered secondary bronze obtained via the method of electroerosive dispersion followed by spark plasma sintering
The results of the comparative tribotechnical tests under the conditions of dry friction showed that the complex indicator of wear resistance—the wear factor (F)—under dry friction conditions, for mates after an electrospark coating method with sintered secondary bronze, was 1.94 less than for mates with a CuAl9Fe3 (CuAl8Fe3) coating
Our experimental studies demonstrated high indicators of the tribotechnical properties of electrospark coatings with electrodes composed of sintered secondary materials (SPS bronze) for mates operating under dry friction conditions
Summary
This results in larger gaps in the joints and the subsequent failure of the assembly units The extension of their service life is achieved either by replacing the worn part with a new component (spare part) or by restoring the functionality of said part via coating methods. A type T-170 tractor uses up to 35 bronze bushings that have notable antifriction properties, corrosion resistance, high specific loads, and high-speed modes [4]. During operation, these parts are subject to intense wear, and require either replacement with new parts or restoration, usually using expensive powder or electrode materials composed of non-ferrous metals or alloys. One method of solving this problem is the recycling of non-ferrous metals and alloys
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