Hydrogen Retention In Plasma‐Sprayed Tungsten

Deuterium retention in plasma‐sprayed tungsten (PSW) was investigated by means of the thermodesorption technique. The material was irradiated by deuterium ions with energies of 200 eV and 3 keV per deuteron, achieving fluences in the range 1022÷1024 D/m2. The observed retention in PSW is four times higher than in polycrystalline tungsten (PCW). An additional high‐temperature peak was found in the thermodesorption spectra of PSW (at 1050 K). The nature of the high‐temperature peak and the mechanism of higher retention in PSW are discussed.