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Information × Registration Number 0212U000284, 0110U004277 , R & D reports Title Increased life and reliability of hardware components, including steam turbines, steam and canal second circuit of NPP with VVER surface modification by ion-plasma method popup.stage_title Head Bilous Vitaliy Arsentievich, Registration Date 30-01-2012 Organization National Science Center "Kharkiv Institute of Physics and Technology popup.description2 For the period under report, modernization of the equipment for purpose of its preparation to deposition of coatings on products of the set geometrical form and function - breadboard models of steam turbine blades is performed. When developing technological process of coating deposition on such details, optimization of following parameters has been performed: permissible quantity of a drop component in the coating, a coating thickness deviation relative to its average value along the samples of blade, and structure of coatings. In particular, it has allowed reducing the total quantity of drops in a covering deposited from a direct plasma stream to ~10 times and considerably limit quantity of the big macroparticles and their size to 1 micron. The Ti, Ti-5%Si and Ti-36%Al cathodes, and nitrogen as a reacting gas was used. It is determined experimentally that concentration of alloying components Si or Al in coatings on blade samples can reach 50 % in comparison with their content in the cathode. These effects should be taken into consideration when working with multicomponent coatings. Roughness Ra of the coatings received has been investigated. The arithmetical-mean deviation of the coating profile was in limits 0,3 - 0,6 microns in all range of gas pressure. The coating thickness deviation along the blade edge of 150 mm in length at rotation on planetary system makes ± 10 %. Experimental deposition of protective TiN, TiSiN coatings on the breadboard models of blades and primary optimization of structure of the coatings in conditions of condensation with use of planetary device for the purpose of obtaining of necessary mechanical and operational characteristics was performed also. When working with Ti - cathode it was succeeded to receive a condensate of the titanium nitride with structural elements of nanostructured range. Comparative experiment proves, that three-component condensates with silicon or aluminium additives are characterized by higher hardness in comparison with two-component titanium based ones. However, such coverings are characterized with high level of the internal stresses arising at synthesis. These stresses limit a boundary thickness of the coatings received. It can be shown as chips on surface, which appear on samples with coatings in the thickness above 10 microns even without any influence on them. At smaller thickness, in absence of chips, such stressed three-component coatings at cavitation influence lose to two-component titanium nitride coatings, and at comparative erosive test using friction machine, TiSiN and TiAlN coatings have advantage. The TiN-coating surfaces are characterized with lower roughness. However, three-component coatings have higher heat resistance: they are not oxidized at heating up to 800oС whereas titanium nitride coatings are oxidized just at ~ 600oС. Product Description popup.authors Єрмоленко Ірина Геннадіївна Антоненко Микола Іванович Білоус Віталій Арсентійович Волошко Петро Федорович Дерюга Наталья Михайлівна Задніпровський Юрій Олексійович Коваленко Володимир Іванович Комар Анатолій Анатолійович Купрін Олександр Сергійович Лимарь Віктор Васильович Ломіно Микола Степанович Маринін Володимир Григорович Мартиненко Людмила Іванівна Москалець Олена Леонідівна Носов Геннадій Ігнатович Овчаренко Валерій Давидович Рижова Тетяна Петрівна Толмачьова Галина Миколаївна Турчина Олександра Карпівна Хороших Володимир Максимович popup.nrat_date 2020-04-02 Close