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Registration Number

0215U006143, 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

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Head

Zmij Viktor Ivanovych,

Registration Date

23-02-2015

Organization

National Science Center "Kharkiv Institute of Physics and Technology

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Making 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 6,6х10-3 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 500оC. 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 500оС 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 500оС and 600оС within 100 hours, and at 800оС 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 increase resource of zirconium alloys in more rigid conditions of operation.

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Білоус Віталій Арсентійович
Василенко Руслан Леонидович
Змій Віктор Іванович
Картмазов Генадій Миколайович
Комар Анатолій Анатолійович
Купрін Олександр Сергійович
Левенець Володимир Вікторович
Лимар Володимир Васильович
Мірошниченко Констянтин Вікторович
Мартиненко Людмила Іванівна
Носов Геннадій Гнатович
Овчаренко Валерій Давидович
Петельгузов Іван Антонович
Рижова Татьяна Петрівна
Сафонов Володимир Йосифрвич
Тимофєєва Єлізавета Володимирівна
Хороших Володимир Максимович
Черноіванова Анна Євгеніївна
Шпагіна Людмила Олегівна

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2020-04-02