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我国最大的托卡马克装置HL-1型环流器的真空第一壁是厚0.5mm的GH39高镍钢。应用动态气流法,测出其试样在160分钟内从室温升至525℃的氮等效总出气最Q_(oc)=2.4帕升cm~(-2),450℃时有最大出气率1.13×10~(-2)帕升cm~(-2)s~(-1)。高灵敏度的质谱分析监测了出气组分的温时行为。主要组分H_2、H_2O,CO和CO_2的出气高峰分别处在450℃、180℃、250℃、250℃。推导出本实验中第i组分的出气率g_(0i)=S_iP_(id)≈S_iP_d·I_i/R_i∑I_i。由叠加组分出气量而得的真实出气总量Q_(0∑)为6.9帕升cm~(-2),其中H_2、H_2O、CO和CO_2的百分比分别为89%、5.6%、3.4%、和2.0%。525℃热解后,样品表面的残气谱和二次离子质谱显示出表面的低原子序数(M/e<23)污染物已有所减少,而铝(M/e=27)和铬(M/e=52)等在表面已有所偏析。
China’s largest tokamak device HL-1-type cyclone vacuum first wall is GHMM high nickel steel 0.5mm thick. Using dynamic flow method, it was found that the maximum equivalence of the total equivalent gas output from room temperature to 525 ℃ in 160 minutes was Q oc = 2.4 Pa liter cm -2, and the maximum gas evolution rate at 450 ℃ 1.13 × 10 ~ (-2) Pa increased cm ~ (-2) s ~ (-1). High-sensitivity mass spectrometry monitored the temperature-dependent behavior of effluent components. The main components of H_2, H_2O, CO and CO_2 peak at 450 ℃, 180 ℃, 250 ℃, 250 ℃. The outgassing rate of the ith component g_ (0i) = S_iP_ (id) ≈S_iP_d · I_i / R_iΣI_i was derived. The total amount of real outgassing Q_ (0Σ) obtained from the superficial component outgassing was 6.9 Pa cm -2, the percentages of H_2, H_2O, CO and CO_2 were 89%, 5.6% and 3.4% respectively, And 2.0%. The residual and secondary ion mass spectra at the surface of the sample after pyrolysis at 525 ° C show that the surface has a low atomic number (M / e <23) of contaminants, while the aluminum (M / e = 27) and chromium M / e = 52) and so on the surface has been segregated.