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Information × Registration Number 0216U002134, 0113U004123 , R & D reports Title The increase service life of Zr-alloys products, including the coat of fuel elements by gas-diffusion and ion-plasma surface treatment popup.stage_title Head Zmij Viktor Ivanovych, Registration Date 27-01-2016 Organization National Science Center "Kharkiv Institute of Physics and Technology popup.description2 Building the atomic power station with reactors of raised power, transition to more long campaigns of fuel elements with higher burning out, and also to operating modes of reactors with power maneuvering essentially increase a loading on zirconium alloys which are the basic constructional material of a fissile region of thermal neutron nuclear reactors. For augment of a resource of operation and prevention of fracture of fuel elements casings which are subject to high stresses, corrosion and temperatures, it is offered to subject to preoxidizing and deposition of coatings. In this work processes of an oxidizing of Zr1Nb alloy are developed at temperatures 300?550оС in a wide range of oxygen pressures with prepumping-out to pressure 6,6?10-3 Pa. The better plan of a preliminary oxidizing which essentially differs from the plans given in patents of the Russian Federation № 2382120, № 2199607, № 2298049 is offered. It is shown, that the thickness and quality of the formed oxide depends on time of an oxidizing more, rather than from pressure of oxygen. Experiments have shown, that preliminary oxidizing fragments of products from zirconium alloys in optimum conditions leads to increasing limit of fluidity, strengths and stretch. Such mode of an oxidizing effectively protects zirconium alloys against corrosion in air at temperatures up to 500 °C. Introduction into the film of elements of 5th group does not lead to substantial growth of corrosion resistance of zirconium. Protection of the zirconium products against oxidizing at temperatures more than 500°С can be ensured by the vacuum-arc coatings. On fragments fuel element tubes from alloy Zr1Nb coatings Cr, CrAlx, ZrN, ZrON, ZrOx, CrN, (Ti0.48Zr0.18Al0.17Nb0.09Y0.08)N have been formed and explored. Trials of samples from zirconium alloy with coatings at oxidizing in air were carried out at temperatures 500°С and 600°С within 100 hours, and at 800°С within 25 hours. Samples without coatings as a result of trials are oxidized and collapse with fall of oxide whereas coatings protect samples from degradation in course of trials. From all tested condensates the most effective for protection of zirconium products are coatings from chrome and its nitrides. Application of the developed technologies will allow to increas resource of zirconium alloys in more rigid conditions of operation. Product Description popup.authors Ільченко Олександр Васильович Білоус Віталій Арсентійович Василенко Руслан Леонідович Змій Віктор Іванович Картмазов Генадій Миколайович Комар Анатолій Анатолійович Купрін Олександр Сергійович Лимар Володимир Васильович Мєльніков Сергій Іванович Москалець Іван Максимович Овчаренко Валерій Давидович Рижова Татьяна Петрівна Рыбальчєнко Нінель Діонисовна Толмачова Галина Миколаївна Турчина Олександра Карпівна Устенко Микола Георгійович popup.nrat_date 2020-04-02 Close