The analysis of the process of separation of liquid metal from the electrode ends at arc metallization within the conditions of a pulsating spraying flow
DOI:
https://doi.org/10.31498/2225-6733.39.2019.213920Keywords:
spraying flow, aerodynamic force, surface tension force, spherical drop, semi-ellipsoid dropAbstract
Among the resource-saving technologies, the method of gas-thermal spraying of coatings, namely arc metallization, is being developed intensively. The current state of research does not fully reflect the physical and chemical processes that occur during arc metallization, which does not allow to improve the technology and equipment for this method, to predict and influence the chemical composition and properties of coatings. The main problem that arises when parts are restored by the arc metallization method is to improve the quality of coatings by reducing the negative impact of oxygen in the spraying airflow. To reduce the oxidizing effect of air-spraying flow on the liquid metal of electrodes the method of arc metallization utilizing the pulsating spraying flow, obtained by introducing an additional element – a valve of the pulsator into the spray system of electroarcmetallizer, was previously introduced. The nature of forces acting on the liquid metal of electrodes at melting by an electric arc without consideration of spraying flow is reviewed. Taking into account the findings presented in the works of V.I. Dyatlov, B.E. Paton, a diagram of liquid metal formation on the cathode and anode depending on the parameters of the electric arc mode without considering the impact of the spraying flow is presented. Under the impact of a pulsating spraying flow, a drop of molten metal of the electrodes will turn into a half-ellipsoid shape. The impact and distribution of forces acting on a drop of such shape and conditions of separation of a drop from the electrode ends are important. Analytical calculation of forces acting on a drop of semi-ellipsoid form during arc metallization with a pulsating spraying flow was carried out in this paperReferences
Перелік використаних джерел (ДСТУ):
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Royanov V. Development of properties of spray flow and nature of pressure distribution in electric arc metallization / V. Royanov, I. Zakharova, E. Lavrova // Eastern-European Journal of Enterprise Technologies. – 2017. – Vol. 6, № 5(90). – Pр. 18-24. – Mode of access: DOI: 10.15587/1729-4061.2017.118252.
Роянов В.А. Снижение воздействия кислорода на жидкий металл при электродуговом напылении пульсирующей струей воздуха / В.А. Роянов, И.В. Захарова, Н.С. Крючков // World Science. – 2019. – № 5(45), vol. 1. 5(45). – Pp. 13-21. – Mode of access: DOI: 10.31435/rsglobal_ws/31052019/6508.
Захарова І.В. Вплив пульсуючого розпилювального потоку на ефективність використання електродів, при утворенні покриттів / І. В Захарова, В. О Роянов, М.С. Крючков // Topical issues of the development of modern science : матеріали 4 Міжн. наук.-практ. конф. (11-13 грудня 2019 р.; София, Болгария). – С. 88-94.
Захарова І.В. Вплив частоти пульсацій на міцність зчеплення покриття з основою / І.В. Захарова, В.О. Роянов, М.С. Крючков // Science and society : 16th International conference (27 December 2019; Hamilton, Canada). – Pp. 6-11.
Роянов В.А. Энерго и ресурсосбережение при электродуговом напылении покрытий : монография / В.А. Роянов, И.В. Захарова. – Мариуполь: ГВУЗ «ПГТУ», ПрАТ «Приазовский рабочий», 2018. – 143 с.
References:
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Royanov V., Zakharova I., Lavrova E. Development of properties of spray flow and nature of pressure distribution in electric arc metallization. Eastern-European Journal of Enterprise Technologies, 2017, vol. 6, № 5(90), pр. 18-24. doi: 10.15587/1729-4061.2017.118252.
Royanov V.A., Zakharova I.V., Kriuchkov N.S. Snizhenie vozdeistviia kisloroda na zhidkii metall pri elektrodugovom napylenii pul'siruiushchei struei vozdukha [Reducing the effect of oxygen on liquid metal during electric arc spraying with a pulsating air jet]. World Science, 2019, № 5(45), vol. 1. 5(45), pp. 13-21. doi: 10.31435/rsglobal_ws/31052019/6508. (Rus.)
Zakharova I.V., Royanov V.A., Kriuchkov N.S. Vpliv pul'suiuchogo rozpiliuval'nogo potoku na efektivnіst' vikoristannia elektrodіv, pri utvorennі pokrittіv. Materіali 4 Mіzhn. nauk.-prakt. konf. «Topical issues of the development of modern science» [The effect of pulsating spray flow on the efficiency of the use of electrodes in the formation of coatings. Proceedings of the 4th Int. Sci.-Pract. Conf. «Topical issues of the development of modern science»]. Sofia, Bulgaria, 2019, pp. 88-94. (Ukr.)
Zakharova I.V., Royanov V.A., Kriuchkov N.S. Vpliv chastoti pul'satsіi na mіtsnіst' zcheplennia pokrittia z osnovoiu. Materіali 16 Mіzhn. konf. «Science and society» [Influence of pulsation frequency on the adhesion strength of the coating to the substrate. Proceedings of the 16th Int. Conf. «Science and society»]. Hamilton, Canada, 2019, pp. 6-11. (Ukr.)
Royanov V.A., Zakharova I.V. Energo i resursosberezhenie pri elektrodugovom napylenii pokrytii: monografiia [Energy and resource saving in electric arc spraying of coatings: monography]. Mariupol, SHEE «PSTU», Priazovskii rabochii Publ., 2018. 143 p. (Rus.)
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