scholarly journals Investigation of the microstructure and X-ray spectral microanalysis of powder material obtained from waste of the KNT16 brand tungsten-free hard alloy

2020 ◽  
Vol 329 ◽  
pp. 02011
Author(s):  
B.N. Sabel’nikov ◽  
A.E. Ageeva ◽  
V.O Podanov ◽  
M.S Korolev
Keyword(s):  

This article presents the results of X-ray spectral microanalysis and the study of the microstructure of an experimental electroerosive powder material obtained from waste of a tungsten-free hard alloy grade KNT16.

Author(s):  
E. V. Ageeva ◽  
B. N. Sabel’nikov

The first appearance of tungsten-free hard alloys (TFHA) was noted in the early 30s of the last century, but they did not receive due attention and, accordingly, spread due to insufficient strength and were replaced by tungsten-containing alloys of such groups as VK, TC and TTK. However, the rapidly developing shortage of expensive tungsten pushed in the late 50s to return to the search for hard alloys, the composition of which does not include tungsten. Due to the growing demand for tungsten-free hard alloys, the problem of recycling their waste with the possibility of reuse is acute in the industry. The purpose of this work was to conduct x-ray spectral microanalysis (RSMA) of powder material (PM) obtained by electroerosive dispersion (EED) in ethyl alcohol from waste of a non-tungsten hard alloy of the KNT16 brand. The resulting powder material was examined using an energy-dispersion x-ray analyzer from EDAX, built into a scanning electron microscope "QUANTA 600 FEG". In the course of scientific research, the spectra of characteristic x-ray radiation on the surface of the experimentally obtained sample were obtained. The results obtained in the course of scientific research can be used to create environmentally friendly resource-saving processes for processing waste of tungsten-free hard alloys into powder materials.


1995 ◽  
Vol 39 ◽  
pp. 571-577
Author(s):  
V. Valvoda ◽  
D. Rafaja ◽  
R. Jenkins

Repetitions of the round robin test on powder diffractometer sensitivity and round robin test of intensity measurements, using two almost identical groups of participants, enabled a comparison to be made of results obtained in different tests. Two forms of corundum test samples were used: (i) sintered plates in tests A8 and A9, and (ii) powder samples in test Bl . A rough comparison of the influence of different methods of specimen preparation from the powder material in different laboratories in test Bl is thus possible with respect to the (almost) uniform sintered plates used in tests A8 and A9. The parameters under investigation were the line positions (and/or inter-planar d-spacing) and intensities of eleven reflections occurring at the 20 angles ranging from 25° to 136° for Cu Kα-radiation


Author(s):  
V. N. Anikin ◽  
S. A. Yeremin ◽  
E. S. Potapova ◽  
A. B. Korshunov ◽  
A. M. Kolesnikova ◽  
...  

The study is devoted to the effect cryoprocessing has on the stabilization of VK6 (hard alloy) after irradiation with fast electrons with energy of 5 MeV. To investigate samples with a close microstructure characteristics, a measurement of a structure-sensitive property -- co-effective force -- was held. It was shown that the treatment of VK6 hard alloy with fast electron irradiation increases its microhardness by 30 % in comparison with the original samples without any irradiation. It was found out that the microhardness of VK6 hard alloy samples after treatment with fast electrons depends on the initial surface structure, so that polished samples have higher values of microhardness than samples which surface were ground. X-ray phase analysis made it possible to establish the difference between the structures of polished and ground surfaces of the VK6 hard alloy in a stressed state. It was also shown that the treatment with fast electrons irradiation with an energy of 5 MeV does not lead to the formation of new phases. To establish the consolidation of the effect of increasing the hardness of the irradiated materials, annealing of VK6 hard alloy samples at the temperature of 30–100 °C (on air) was held. Cryoprocessing allowed us to consolidate the effect of increasing microhardness of the surface (surface microhardness) and wear resistance after irradiation of the VK6 hard alloy. Ill. 5. Ref. 10.


2018 ◽  
Vol 224 ◽  
pp. 01008
Author(s):  
Viktor Gileta ◽  
Anatoly Beznedelnyy

The working capacity of indenters prepared from hard alloy VK8 under conditions of reinforcing finishing treatment by ultrasonic tools was investigated. It was found that under normal treatment conditions, normal wear of the hard alloy takes place. An electron microscopic study of the morphology of the surface of the wear area and its state after the etching of cobalt (Co) using replicas was performed. X-ray microanalysis of the wear area was performed. No obvious traces of adhesive, diffusion, abrasive wear were detected. It was shown that the deterioration of the hard alloy tool VK8 mainly occurs as a result of fatigue failure, which leads in the investigated speed range of the part 10...120 m/min to the precipitation of individual carbide grains and whole groups of them. The non-linear nature of the wear-velocity curve is due to allotropic transformations of cobalt. It was found that at cobalt speeds of 10...50 m/min, the first allotropic transformation from the initial β-Co state to α-Co occurs, and then the second partial allotropic conversion of α-Co to β-Co occurs at a velocity of more than 50 m/min. The presence of a β-Co phase, which is more brittle, leads to an intensification of wear. The WC-WC boundaries and the deformation of WC carbides are not responsible for the formation of the wear surface microrelief and the integral wear of the carbide tool.


2016 ◽  
Vol 685 ◽  
pp. 724-728
Author(s):  
Sergey P. Zhuravkov ◽  
Alexsey Pobol ◽  
Galina L. Lobanova ◽  
George Goranskyi ◽  
Filipp Saprikin

Powders of WC-6Co hard alloy were produced using spark erosion in distilled water. The properties of powders, such as specific surface area, morphology, structure and size distribution, were studied. Investigation of the powder properties was made using the methods of scanning electron microscopy, X-ray phase analysis and disk centrifuge.


2021 ◽  
Vol 346 ◽  
pp. 02008
Author(s):  
Stepan Pavlov ◽  
Nikolay Makarov

The effect of the anionic composition on the preparation of powder material in the ZnO – SnO2, system by the sol-gel method has been investigated. It was found that the best composition of zinc orthostannate is obtained using zinc sulfate and tin (IV) chloride. According to the data of X-ray phase analysis, the optimum temperature for the synthesis of the material is 1050 °C.


2020 ◽  
Vol 315 ◽  
pp. 01002 ◽  
Author(s):  
Vladimir Serebrovsky ◽  
Boris Sabel’nikov

This article presents a study of the phase composition of powder electroerosive materials of TFHA grade KNT16, obtained in ethyl alcohol. It was established that the main phases in the test sample are TiC, MoNi3, Ni, Mo.


Author(s):  
А.М. Бадамшин ◽  
С.Н. Несов ◽  
В.С. Ковивчак ◽  
С.Н. Поворознюк ◽  
В.В. Акимов

The effect of ion beams with different intensity and duration on the change in the elemental composition and chemical state of the tungsten-free hard alloy (50% TiC - 50% TiNi) surface layers has been investigated. The analysis of the morphology and composition of the hard alloy surface layers after both exposure to continuous and powerful ion beams was carried out by scanning electron microscopy and X-ray photoelectron spectroscopy. It is shown that irradiation with a continuous ion beam causes additional oxidation of the hard alloy surface. It was found that the impact of the powerful ion beam leads to a decrease in metal oxides amount and the formation of titanium carbides in the intermetallic binder phase (TiNi) of the hard alloy.


2019 ◽  
Vol 945 ◽  
pp. 749-755
Author(s):  
P.P. Sharin ◽  
M.P. Akimova ◽  
S.P. Yakovleva

For the enhancement of chemical and mechanical adhesion of natural diamond particles with a hard-alloy matrix during the synthesis of diamond-abrasive composites the hybrid technology which combined in one technological process the thermal diffusion metallization of diamond particles and sintering by the developed scheme of the self-dosed impregnation is proposed. This technology does not include a reheating of the metallized coating that causes its destruction and enhances graphitization of diamond thus limiting the application of metallization method for improvement of diamond retention and creation of high-functional composites for diamond tools. Formation and preservation of adhesion-durable metallized coating is confirmed by experiments simulating the conditions of high temperature interaction of diamond with a carbide-forming metal and a hard-alloy matrix during the sintering of special samples using the regimes of developed technological process. The structural and phase state of the transition zone is studied by scanning electron microscopy, X-ray structure analysis and X-ray phase analysis of the partition surfaces of the contact zone between the diamond and the matrix obtained by tensile testing of special samples. Comparative service properties tests of prototype and control samples of diamond dressers confirmed efficiency of the developed hybrid technology for the creation of diamond tools.


Sign in / Sign up

Export Citation Format

Share Document