DSpace Collection:https://er.nau.edu.ua/handle/NAU/350052024-03-29T01:38:39Z2024-03-29T01:38:39ZHeat exchange calculation in the intermediate container under electron-beam meltingЦибрій, Юрій ОлександровичГрабовський, Георгій Геннадійовичhttps://er.nau.edu.ua/handle/NAU/350142018-06-08T10:32:59Z2015-01-01T00:00:00ZTitle: Heat exchange calculation in the intermediate container under electron-beam melting
Authors: Цибрій, Юрій Олександрович; Грабовський, Георгій Геннадійович
Abstract: The model of titanium liquid melt heating in the intermediate container of electron-beam
furnace is developed considering its flow. On the basis of the developed mathematical
model, a series of numerical experiments was conducted using finite-element
method and finite-difference method. The analysis of model parameters effect on the melt
temperature field formation was carried out. These researches results may be useful for the
further development of electron-beam guns control algorithms.2015-01-01T00:00:00ZThe mechanism of friction between surfaces with regular micro grooves under boundary lubricationПашечко, Михайло ІвановичКіндрачук, Мирослав ВасильовичРадіоненко, Олександр Васильовичhttps://er.nau.edu.ua/handle/NAU/350012019-05-07T12:05:19Z2016-12-01T00:00:00ZTitle: The mechanism of friction between surfaces with regular micro grooves under boundary lubrication
Authors: Пашечко, Михайло Іванович; Кіндрачук, Мирослав Васильович; Радіоненко, Олександр Васильович
Abstract: The results of researches related to the influence of partially regular microrelief parameters on the adhesion component of the friction factor under boundary lubrication have been given. A special ring-on tape test rig is proposed in order to avoid errors during running-in process. Special technique is used to form sinusoidal microgrooves what helped to create a partially regular microrelief on the surface with controlled contour and nominal contact areas. Fatigue and deformation components of wear process are considered. We proved that microtexturing with proposed parameters decreases the adhesion component of friction and reduces the probability of microwelding. It has been shown that under boundary friction micro grooves are effective on precision surfaces with low roughness when lack of film and probability of seizure appear.2016-12-01T00:00:00ZImprovement of the quality of tic-co system plasma coating by laser treatmentКіндрачук, Мирослав ВасильовичШевченко, ОлексійКрижанівський, Андрій Станіславовичhttps://er.nau.edu.ua/handle/NAU/347742019-05-07T12:04:38Z2016-01-01T00:00:00ZTitle: Improvement of the quality of tic-co system plasma coating by laser treatment
Authors: Кіндрачук, Мирослав Васильович; Шевченко, Олексій; Крижанівський, Андрій Станіславович
Abstract: The paper considers the possibility to improve the quality of a plasma coating by means of a laser treatment
in the melting and thermal cycling modes. This method provides stronger adhesion of a coating to its base material
as well as higher wear resistance. The regularities of the laser treatment in the melting and thermal cycling modes
are determined, and a connection between the technological parameters and the quality characteristics is shown.2016-01-01T00:00:00ZFunctional plasma-deposited coatingsПашечко, Михайло ІвановичКіндрачук, Мирослав ВасильовичГуменюк, Ігор АнатолійовичТісов, Олександр ВікторовичЗагребельний, Володимир Вікторовичhttps://er.nau.edu.ua/handle/NAU/347722019-05-07T12:03:52Z2017-12-01T00:00:00ZTitle: Functional plasma-deposited coatings
Authors: Пашечко, Михайло Іванович; Кіндрачук, Мирослав Васильович; Гуменюк, Ігор Анатолійович; Тісов, Олександр Вікторович; Загребельний, Володимир Вікторович
Abstract: The paper focuses on the problem of low adhesion of plasma sprayed coatings to the substrate. The subsequent laser treatment modes and their influence on the coating-substrate interface were studied. This allows to decrease the level of met-stability of the coating, thus decreasing its hardness down to 11–12 GPa on the surface and to about 9 GPa on depth of 400 μm. The redistribution of alloying elements through solid and liquid diffusion improves mechanical properties and rises the adhesion up to 450 MPa after remelting and up to 90–110 MPa after laser-aided thermal cycling. At the same time, remelting of coating helps to decrease its porosity down to 1%. The obtained complex of properties also allows to improve wear resistance of coatings and to decrease friction factor.2017-12-01T00:00:00Z