Correlation of radius of cathode spot of vacuum arc of metals on the size of generated droplets
https://doi.org/10.29235/1561-8358-2021-66-4-391-398
Abstract
The simple relation to estimate the cathode spot radius of a vacuum arc of pure metals is obtained. On its basis, is established between the cathode spot radius and the size of droplets generated by the cathode spot a correlation. This enables to find ways to reduce droplets in the plasma flow, which forms coatings by the vacuum electric arc method. The paper presents the results of experimental study of the droplet sizes depending on the vacuum arc current iд. The size and amount of the droplets on an area of 1 mm2 of the coating surface are determined using the ImageSP program. As the initial data, the microstructures of the coatings are used with an increase of: ç100, ç200, ç500, ç1000, ç1500. The droplets have been generated by a cathode spot of a vacuum arc for the alloy of the composition, at.%: 68Al–8Cr–4Nb–20Si. It is established that the number of droplets with a diameter of < 2 μm is generated most of all, and the number of droplets with a diameter > 10 μm is generated least of all. The number of generated droplets with a diameter from 2 to 10 μm slightly depends on the arc current iд. It is noted that the diameter of the alloy droplet is smaller than the diameter of the droplets generated by the cathode spot on its components due to the fact that the radius of the cathode spot on the alloy is smaller than the radius of the cathode spot on its pure components.
About the Authors
G. V. Markov
Physical-Technical Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Gennady V. Markov – Ph. D. (Engineering), Senior Researcher
10, Academician Kuprevich Str., 220141, Minsk, Republic of Belarus
A. T. Volochko
Physical-Technical Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Alexander T. Volochko – D. Sc. (Engineering), Professor, Head of the Department
10, Academician Kuprevich Str., 220141, Minsk, Republic of Belarus
V. G. Zaleski
Physical-Technical Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Vitali G. Zaleski – D. Sc. (Physics and Mathematics), Director
10, Academician Kuprevich Str., 220141, Minsk, Republic of Belarus
N. Yu. Melnik
Physical-Technical Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Natalia Yu. Melnik – Researcher
10, Academician Kuprevich Str., 220141, Minsk, Republic of Belarus
References
1. Mrochek Zh. L., Eizner B. A., Markov G. V. Basics of Formation of Multicomponent Vacuum Electric Arc Coatings. Minsk, Navuka i tekhnika Publ., 1991. 152 p. (in Russian).
2. Lafferty J. M. (ed). Vacuum Arcs: Theory and Applications. Wiley, 1982. 432 p.
3. Lyubimov G. A., Rakhovskii V. I. Cathode spot of vacuum arc. Uspekhi fizicheskikh nauk = Soviet Physics-Uspekhi, 1978, vol. 21, no. 8, pp. 693–718. https://doi.org/10.1070/pu1978v021n08abeh005674
4. Rahovskiy V. I. Physical Basis of Electric Current Communication in Vacuum. Moscow, Nauka Publ., 1971. 369 p. (in Russian).
5. Boxman R. L., Sanders D. M., Martin Ph. J. (eds.). Handbook of Vacuum Arc Science and Technology: Fundamentals and Applications. New Jersey, Noyes Publications, 1995. 773 p.
6. Aksenov I. I. (ed.). Vacuum Arc. Kyiv, Naukova dumka Publ., 2012. 727 p. (in Russian).
7. Kessaev I. G. Cathodic Processes of an Electric Arc. Moscow, Nauka Publ., 1968. 253 p. (in Russian).
8. Mesyats G. L. Ectons in Vacuum Discharge: Breakdown, Spark, Arc. Moscow, Nauka Publ., 2000. 424 p. (in Russian).
9. Aksenov I. I. Vacuum Arc in Erosive Plasma Sources. Kharkov, National Scientific Center “Kharkov Institute of Physics and Technology”, 2005. 212 p. (in Russian).
10. Anders A. Cathodic Arcs. From Fractal Spots to Energetic Condensation. Springer, 2008. 540 p. https://doi.org/10.1007/978-0-387-79108-1
11. Tranter C. J. Integral Transforms in Mathematical Physics. London, Methuen & Co., 1951. 126 p.
12. Ivanovskii M. N., Sorokin V. P., Subbotin V. I. Evaporation and Condensation of Metals. Moscow, Nauka Publ., 1976. 287 p. (in Russian)
13. Laskovnyov A. P., Volochko A. T., Markov G. V., Ralko A. P., Misuno P. N., Makarova Zh. E. Ionization processes in the cathode spot of a vacuum arc of metals. Sovremennyie metody i tehnologii sozdaniya i obrabotki materialov: sbornik nauchnyih trudov. Kniga 2: Obrabotka metallov davleniem [Modern Methods and Technologies for Creating and Processing Materials: Collection of Scientific Papers. Book 2: Forming Metals]. Minsk, Physical-Technical Institute of the National Academy of Sciences of Belarus, 2013, pp. 364–370 (in Russian).
Review
Views: 439
Email this article 
