Abstract
The work presents study results of the applicability of high-temperature heat treatment (500-700°C) of nitride ceramics irradiated with protons with an energy of 1.5 MeV and a dose of 10 16 cm−2 . It was found that heat treatment for 60 minutes at a temperature of 700°C allows us to significantly reduce the density of radiation-induced defects and distortions in ceramics structure due to partial annihilation and relaxation of point defects. Dependences of changes in the strength and mechanical characteristics of ceramics on the temperature of post-irradiation annealing are shown. Based on the data obtained, a conclusion was made about prospects of using post-irradiation annealing to maintain the strength of ceramics subjected to loading during operation.
Highlights
In modern materials science of structural materials, one of the promising tasks is to find a solution to the problem of wear resistance and strength of materials during operation under the influence of ionizing radiation [1,2,3]
It was found that heat treatment for 60 minutes at a temperature of 700°C allows us to significantly reduce the density of radiation-induced defects and distortions in ceramics structure due to partial annihilation and relaxation of point defects
For structural materials for nuclear energy of new generation reactors, the use of ceramic materials based on nitrides, carbides or oxides leads to a significant increase in temperature variations in operating conditions, and in a significant increase in the operation life [4, 5]
Summary
In modern materials science of structural materials, one of the promising tasks is to find a solution to the problem of wear resistance and strength of materials during operation under the influence of ionizing radiation [1,2,3]. Formation of gas inclusions and regions with an increased concentration of defects [14, 15] are observed when exposed to light gas ions, such as helium, carbon or protons, which have poor solubility, high mobility, the ability to implant and subsequent agglomeration in the structure of surface layer at high irradiation doses. In this case, the hexagonal type of crystal structure leads to an uneven distribution of these defective regions in the structure. The uneven distribution of defects in the structure can lead to an increase in overstrain and distortions in the structure, which subsequently negatively affects the operation properties of ceramics [16,17,18]
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