【摘要】 钾（K）掺杂钨（W）合金已经表现了优异的高温力学性能,成为最有希望的PFMs备选材料之一。为评估氢同位素在W-K合金中的滞留情况,采用放电等离子烧结技术（SPS）,制备了纯W及K含量82μg/g的W-K合金,通过气相热充法引入氘（D）元素,考察热脱附行为。研究表明,气相热充氘释放温区从600K延伸至1200K,掺杂K后,D脱附活化能从0.86 eV下降到0.68 eV;纯W样品D滞留量在1×10^-6（原子比）左右,掺杂K后有所提高,但依然大大优于商用ITER级纯W。更多还原

【Abstract】 As the most promising plasma facing materials(PFMs), potassium doped tungsten alloy exhibits excellent high temperature mechanical properties. In order to evaluate the hydrogen isotope residence in WK alloy, the pure W and the WK alloys doped with 82 μg/g potassium were prepared by spark plasma sintering(SPS). After deuterium was introduced into potassium doped tungsten alloy by gas-phase thermal charge, thermal desorption spectra(TDS) were obtained at different heating rates. The results show that deuterium release occurs gradually at 600~1200 K. And after doping K, the activation energy of thermal desorption of deuterium reduces from 0.86 to 0.68 e V. The retention of deuterium in tungsten sample is less than 1×10-6(atom ratio) and it is enhanced with doping K, but still lower than that of commercial pure W alloy.更多还原