标题： 理解纯钨在空气中的氧化及其对聚变能电厂生命周期的影响 显示英文标题

标题： Understanding the oxidation of pure Tungsten in air and its impact on the lifecycle of a fusion power plant

摘要： 纯钨的氧化和氧化钨的升华已被研究，以评估它们对聚变能电站生命周期的影响。 纯钨在400至1050摄氏度的温度下进行了氧化，并且持续时间在1至70小时之间。在600摄氏度以上的温度下观察到了空洞和裂纹的形成，导致灰尘或氧化物剥落的产生，这可能在聚变能电站的维护和废物处理场景中造成问题。 在样品边缘发生的优先氧化已被表征，并且其影响与部件设计的关系进行了讨论。 使用电子显微镜和拉曼光谱进行的表征显示，氧化层由三层主要结构组成：内层是30-50纳米厚的WO2氧化物，中间层是10-20微米的WO_2.72，外层由WO2.9/WO3相构成——其厚度根据氧化层的总厚度而变化。 所观察到的微观结构与抛物线到线性动力学的关系进行了讨论，以及其对氚渗透和去氚效率的潜在影响。 显示英文摘要

摘要： The oxidation of pure W and the sublimation of W oxide have been investigated to assess their impact on the lifecycle of a fusion power plant. Pure W has been oxidised at temperatures between 400 and 1050C and for durations ranging between 1 and 70 h. The formation of voids and cracks has been observed at temperatures above 600C, leading to the formation of dust or oxide spalling, which could be problematic in maintenance and waste-handling scenarios of a fusion power plant. Preferential oxidation taking place at the edge of the specimen was characterised, and its impact is discussed in relation to component design. Characterisation using electron microscopy and Raman spectroscopy revealed that the oxide scale is formed of three main layers: the inner layer is 30-50 nm thick WO2 oxide, the middle layer is a 10-20 um of WO_2.72 and the outer layer is formed of WO2.9/WO3 phases - whose thickness varies according to the total thickness of the oxide scale. The observed microstructure is discussed in relation to the parabolic-to-linear kinetics and its potential impact on tritium permeation and detritiation efficiency.