Study On The Ability Of Fill Ar Into Hollow Glass Microspheres By Ion Irradiation

Now,the Inertial Confinement Fusion（ICF）is one of the ways to fusion which is at the forefront of the word.Hollow glass microspheres（HGM）are used as carriers for nuclear reaction fuels（such as deuterium or tritium）at the ICF.However,it needs to fill a small amount of inert gas（such as argon）into the HGM.But,how to inject argon with larger atomic size without damaging the HGMs has become a difficult problem in this project.Ion beam irradiation modification method aims at forming diffusion micro-channels on the shell of HGMs which irradiated by ion beams.This method can improve the diffusion coefficient of microspheres to inert gases and enhance the diffusion probability of inert gases.And the advantage is that ionic beam irradiation does not cause obvious changes in the macroscopic properties of HGMs.In this work,we study the effect of argon charging in irradiated HGMs.At the experiment,multiple energy（7 MeV+4 MeV+2 MeV）Xe²⁶⁺ions beam and 15MeV Si⁶⁺ion micro-beam were used to irradiate the HGMs.And then,the irradiated HGMs were charged with argon at different temperatures and pressures.At the same time,in order to study the influence of annealing on the mechanical properties of HGMs,the glass sample with the same composition of the HGM was irradiated by 2.6MeV Ar ions.And to conduct nano-indentation and surface analysis on the glass to simulate the changes of mechanical properties and surface roughness of HGMs.Through the series of experimental studies,we can draw the following conclusions:1.After irradiation by multiple energy（7 MeV+4 MeV+2 MeV）Xe²⁶⁺ion beam,when damage reached 0.89 dpa,the presence of argon in the HGM can be obviously detected by the method of X-Ray Fluorescence.The conditions are room temperature（25oC）,the pressure is 0.5 MPa and temperature is 200oC,the pressure is 0.35 MPa,and the keep-time is 42 h.2.After irradiation by 15 MeV Si⁶⁺ion micro-beam,All the microspheres had no argon signal at the room temperature.When the fluence reached 1.6×10¹⁶ ions/cm²and 3.0×10¹66 ions/cm²,with the temperature of 200oC,300oC,400oC and 500oC,by change the pressure,the argon signal can be seen through the XRF in a part of microspheres.The highest argon signal of HGM was detected by quadrupole mass spectrometer,and the argon content in the microsphere can reach 3.10 bar.3.By XRF measurement of argon signal for many times,the gas retention performance of HGMs can be detected.After the multiple energy irradiated microsphere was placed for 48 hours,the strength of argon decreased significantly.After the placement for 2 months,the content of argon was basically the same as that after the placement for 48 hours.But,after 15 MeV Si⁶⁺micro-beam irradiation,the microsphere has a better gas retention performance.After 2 months of placement,the argon content of the microspheres are basically unchanged.4.The compressive strength of the microspheres was evaluated by statistical analysis of the degree rate in the experiment.The damage rate of multiple energy Xe²⁶⁺ions beam irradiated HGMs was 17.5%at 400oC.The damage rate of 15 MeV Si⁶⁺micro-beam was 25.6%at 500oC.5.Nano-indentation and surface analysis were used on the glass with the same components as HGM which irradiated by 2.6 MeV Ar⁹⁺ion to simulate the mechanical properties and surface roughness changes of the HGM.And the results showed that:the hardness and modulus of the microsphere-glass are decreased after ion irradiation,and the recovery resistance is obviously increased.After annealing,the hardness and modulus of un-irradiated samples showed an upward trend,and the recovery resistance did not change within the error range.Furthermore,the hardness of the irradiated microsphere-glass is increased,while the modulus and the recovery resistance are significantly decreased.After annealing at about 250oC,the recovery resistance of the irradiated sample is the same as the un-irradiated sample within the error.