钾掺杂钨合金中气相热充氘的热脱附行为

Thermal Desorption Behavior of Deuterium by Gas-phase Thermal Charge from Potassium Doped Tungsten Alloy

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82 ppm的W-K合金,通过气相热充法引入D元素,考察热脱附行为。研究表明,气相热充D释放温区从600 K延伸至1200 K ,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滞留量不到1 appm左右,掺杂K后有所提高,但依然大大优于商用ITER级纯W。

Abstract:

As the most promising plasma facing materials (PFMs),potassium doped tungsten alloy have exhibited excellent high temperature mechanical properties. In order to evaluate the hydrogen isotope residence in WK alloy,the pure W and the WK alloy with 82 ppm potassium doping 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 with different heating rates. The results show that deuterium released gradually at 600 K～1200 K. And after doping K, the activation energy of thermal desorption of deuterium reduced from 0.86 eV to 0.68 eV; The retention of deuterium in tungsten sample is less than 1 appm and it is enhanced with doping K,but still lower than that of commercial pure W