Conferences

Effect of Chromium, Vanadium, Al2O3–Cr, and Al2O3-V Coatings on the Strength of Uranium Dioxide Granules

A.P.Patokin,
 
V.L.Kapustin,
 
B.M.Shirokov,
 
A.V.Shiyan
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #05/06
http://www.materials.kiev.ua/article/937

Abstract

The strength properties of uranium dioxide particles coated with chromium, vanadium, Al2O3–Cr, and Al2O3–V are tested by diametrical compression between two parallels planes in the temperature range from 20 to 900 0С. It is shown that the strength of particles depends on the coating thickness and material, strength of the fuel core (kernel), loading rate, and test temperature. The particle strength grows with an increase in coating thickness and test temperature, reaching its maximum at 700 to 900 0С. The coating fracture pattern changes from intercrystalline rupture (20–150 0С) to ductile fracture (650–900 0С). Methods are proposed for both statistical processing of test results and probabilistic particle strength assessment. It is shown that the strength of coated particles is well described by the Weibull probabilistic dependence, which makes it possible to predict the fracture of particles at any load. The particle strength versus load has been probabilistically estimated at different temperature values.


CHROMIUM, COATINGS, PARTICLE, STRENGTH, TEMPERATURE, URANIUM DIOXIDE, URANIUM DIOXIDE, VANADIUM