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本文报导了在温度范围1000—1500℃,界面接触压力为2.7kg/cm~2,真空条件下UO_2和Zr-4金属的化学相互作用的研究结果。发现当实验温度低于1500℃时,化学相互作用的结果在两种材料界面附近生成一个具有α-Zr(o)_a,(U、Zr)合金α-Zr(o)_a三种不同金相区域的反应层。在更高的温度下生成的反应层可分为α-Zr(o)_c(U.Zr)_Ⅰ,α-Zr(o)_Ⅲ,(U.Zr)_Ⅱ四种不同的金相区域。物相分析发现,(U.Zr)合金区由δ-UZr_2,δ-U_(0.6)Zr_(2.4),α-U和另一种未知名称的(U.Zr)化合物组成。在1500℃以下,氧原子的扩散控制了化学相互作用过程,但在更高的温度下,铀原子在Zr-4合金中的扩散变得更为重要。
This paper reports the results of the chemical interaction between UO_2 and Zr-4 metals at a temperature in the range of 1000-1500 ° C with an interfacial contact pressure of 2.7 kg / cm 2 under vacuum. It is found that when the experimental temperature is lower than 1500 ℃, the chemical interaction results in the formation of three different α-Zr (o) _a, (U, Zr) α-Zr Area of the reaction layer. The reaction layer formed at higher temperature can be divided into four different metallographic regions of α-Zr (O) _c (U.Zr) _Ⅰ, α-Zr (O) _Ⅲ and (U.Zr) _Ⅱ. The phase analysis shows that the (U.Zr) alloy zone consists of δ-UZr_2, δ-U_ (0.6) Zr_ (2.4), α-U and another U.Zr compound of unknown origin. At temperatures below 1500 ° C, diffusion of oxygen atoms controls the chemical interaction, but diffusion of uranium atoms in Zr-4 alloys becomes even more important at higher temperatures.