Zr-4管材干湿法渗氢工艺对比

Comparison between Dry and Wet Hydrogenating Technologies for Zr-4 Tubes

摘要: 利用Zr-4管材开展了干法渗氢和湿法渗氢实验，对工艺特点进行了分析。结果表明：对于湿法渗氢工艺，试样渗氢均匀，试样在高压釜均温区中的位置对渗氢结果没有显著影响。对于干法渗氢工艺，试样不同部位渗氢量可能存在明显差异，试样位置对渗氢量也有显著影响。湿法渗氢工艺比干法渗氢工艺更稳定。使用LiOH·H ₂O配制溶液开展湿法渗氢时，当Li浓度为0.4~0.6 mol/L，单位增重(ΔW, mg/dm²)与渗氢量(ΔHs, ppm)对应的关系为ΔHs = −1.39218 + 5.28783 × ΔW。两种渗氢工艺下氢化物分布存在明显差异，湿法渗氢获得的管材内中外三层的氢化物取向因子差异更大。湿法渗氢工艺更适合用于成品管材检验。

Abstract: Zr-4 tubes were used for dry and wet hydrogenating experiments and further the technological characteristics were analyzed. The results show that in the wet hydrogenating technology, samples are hydrogenated evenly and the locations of samples in the uniform temperature zone of the au-toclave do not have obvious influence on the hydrogenating results. Nevertheless, in the dry hy-drogenating technology, the amounts of absorbed hydrogen may differ significantly among differ-ent parts of the same specimen and the locations of samples also affect the amount of absorbed hydrogen. The wet hydrogenating technology is more stable than the dry one. When the dose of lithium ranges from 0.4 mol/L to 0.6 mol/L with the use of LiOH·H ₂O for the preparation of the so-lution to conduct wet hydrogenating experiments, the relationship between the weight gain (ΔW, mg/dm²) and the amount of absorbed hydrogen (ΔHs, ppm) is ΔHs = −1.39218 + 5.28783 × ΔW. The hydride distributions in the two hydrogenating technologies differ obviously. In the wet hy-drogenating technology, the hydride orientation factors for the inner, middle and outer layers of the tubes differ more greatly. The wet hydrogenating technology is more suitable for the inspection of tube products.