We study the influence of the conditions of thermochemical treatment (TCT) of annular specimens cut out from a fuel cladding tube made of Zr–1% Nb alloy on their oxidation in air at a temperature T = 550°C for up to τ = 100 h. It is shown that the conditions of TCT in controlled oxygen-containing gas atmospheres decrease the mass increment in the course of oxidation as compared with untreated specimens. It was established that the conditions leading to a greater decrease in the mass increment of the specimens in the process of oxidation also correspond to the minimal sum of recorded acoustic-emission signals in the course of their deformation. It was discovered that TCT does not decrease the mechanical characteristics of the tubes but, at the same time, slows down their deterioration during oxidation. By using the accumulated results, i.e., in view of the deceleration of the process of oxidation in air with preservation of the mechanical properties of Zr–1% Nb alloy, we can make a conclusion that TCT is a promising procedure in the technological process of final thermal treatment of fuel cladding tubes.

我们研究了从温度为T的Zr–1％Nb合金制成的燃料包壳管中切出的环形试样的热化学处理（TCT）条件对其在空气中氧化的影响。= 550°C达到τ= 100 h。结果表明，与未处理的样品相比，在受控的含氧气体气氛中TCT的条件降低了氧化过程中的质量增量。可以确定的是，在氧化过程中导致试样质量增加更大减小的条件也对应于在其变形过程中所记录的声发射信号的最小和。发现TCT不会降低管的机械特性，但是同时减缓了管在氧化过程中的劣化。通过使用累积的结果，即考虑到空气中氧化过程的减速并保留了Zr–1％Nb合金的机械性能，