Abstract
The wide use of the EED method for processing metal waste into powders for the purpose of their reuse and application in additive technologies is hampered by the lack in the scientific and technical literature of full-fledged information on the effect of the initial composition, regimes and media on the properties of powders and technologies of practical application. Therefore, in order to develop technologies for the reuse of electroerosive powders and to evaluate the effectiveness of their use, complex theoretical and experimental studies are required. The purpose of this work is the study of the porosity of additive products from electroerosive cobalt-chrome powders. For the implementation of the planned studies, wastes of the cobalt-chrome alloy of the brand KHMS “CELLIT” were chosen. As a working fluid, butanol (butanol-1) was used. For the production of cobalt-chrome powders, a unit for EED of conductive materials was used. Dispersion parameters: voltage 100 V, capacity 48 μF, repetition rate 120 Hz. Therefore, two or more pores because of the absence on the thin section of the visible boundary of their division can be fixed as one large. In addition, the method gives the distribution of pores in one plane of the sample, where narrow and wide sections of the sample fall, while in the hydrostatic weighing method and mercury porosimetry the pore sizes are fixed at their narrowest cross section. A consequence of these factors is the displacement of the function and distribution in the region of large pores. The porosity was determined using an Olympus GX51 optical inverted microscope with software for quantitative image analysis. Prepared samples had no traces of grinding, polishing or dying of structural components. Based on the results of conducted studies of the porosity of additive products from electroerosive cobalt-chrome powders, it has been experimentally established that the porosity does not exceed 1,06%.
Highlights
Manufacturers of additive machines are suppliers of consumables, and these firms do not produce powders, but participate in their preparation for work on their machines
In particular, manufacturers of additive machines insure themselves against possible claims to the quality of powders on the part of consumers
The main requirement for powders for additive machines is the spherical shape of the particles
Summary
Manufacturers of additive machines are suppliers of consumables, and these firms do not produce powders, but participate in their preparation for work on their machines. In connection with the underdevelopment of the Russian market, metal powder preparations for additive machines are mainly purchased abroad.
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