基于LabVIEW的Sieverts型装置扩容气路容积标定

提出了一种基于LabVIEW的扩容气路容积标定方法。该方法利用亥姆霍兹型氢气状态方程构建了压力-组成等温(p-C-T)曲线测试与动力学曲线测试的数学模型,对储氢性质稳定的合金样品p-C-T曲线实验测试数据进行3次Hermite插值,获得动力学曲线平衡压力对应的储氢量,依据单点储氢量计算模型算出扩容气路的容积。编制的LabVIEW程序包括数据采集、数据读取、数据计算与修正、图形显示等模块。实验结果表明,该方法操作简单,准确度高,可直观显示标定效果。

用Sievert法结合实验测量计算^(60)Co射线的体模散射修正系数

目的 用Sievert剂量计算公式结合实验测量的数据计算60 Co产生的射线在等效体模中的散射修正系数。方法 采用四川成都体模和TLD法测量体模的吸收剂量 ,并用MATLAB应用程序来拟合修正系数。结果 给出了等效体模的散射修正系数 ,并计算了两种模拟事故情况下的重要器官的剂量 ,和它们与TLD法测出的剂量值间相对偏差。结论 在两种事故情况下 ,用理论公式计算的剂量与测量值相关不大 。

聚变堆氚的环境安全评估

对国家863项目聚变实验增殖堆工程概要设计(FEB-E)进行了氚环境安全问题评估。FEB-E是采用液态锂作为包层氚增殖剂。每个包层模块各区之间用隔板隔开,中间通高压氦气冷却,包层第一壁和偏滤器也用氦气冷却。运用自行研制的SWITRIM程序和Sieverts' 定律研究了正常工作状态下和事故状态下可能造成氚的环境污染水平。研究表明,正常工作状态下包层液态锂中的氚分压在10-6～10-8Pa。造成氚环境污染的主要危险来自氚循环回路中的偏滤器子系统的抽出气体泄漏。因此,提高堆芯等离子体燃耗和真空系统设计性能是重要的。

液态ZL101 Al合金吸氢特性的研究

根据Sieverts定律，研制了检测液态Al合金吸氢量的计算机辅助实验系统，应用该系统实验研究了国际ZL101Al合金液态下的吸氢特性，实验结果表明，融体温度和铝液与水蒸气接触时间是决定铝液吸氢量的关键因素，并且试块上气孔面积率随两因素的增强而急剧增加，实验系统测量循环时间为70s，测量温差小于0．02cm3／100g，可以在生产中用于在线检测。

亚稳β型TB8钛合金置氢特性研究

文章采用高温气相充氢法对TB8钛合金进行常压置氢实验,以研究亚稳β型TB8钛合金的置氢特性,即氢气流速、置氢温度和置氢时间对置氢量的影响规律,并建立了相应的数学模型。结果表明,氢气流速越快,合金中氢的质量分数越高,最终达到饱和;置氢量随置氢温度的变化规律为先增加后降低,当达到峰值后遵从Sievert’s定律;随置氢时间的延长,置氢量逐渐增加,并最终趋于平衡。

重稀土元素掺杂对2:17型SmCo合金的吸氢能力的影响

近年来,关于NdFeB永磁材料吸氢性能已有大量的研究,发展了氢破碎工艺,并已在NdFeB磁体工业化生产中广泛的应用。然而对于2:17型SmCo永磁材料,因其与氢气的反应机理比较复杂的,吸氢性能的研究有限。前人的研究结果表明:重稀土元素的掺杂可以大幅度降低2:17型SmCo磁体的温度系数。但是重稀土元素掺杂对于2:17型SmCo合金的吸氢能力研究很少。本文研究重稀土Dy和Gd掺杂对于2:17型SmCo合金的吸氢性能的影响。

Hydrogen Solubility in Liquid and Solid Pure Aluminum—Critical Review of Measurement Methodologies and Reported Values

Reliable information on the solubility of hydrogen in aluminum and its alloys is critical to the effort of the aluminum industry to control and ameliorate the usually deleterious effects of hydrogen on the properties and performance of pure aluminum and aluminum alloy products. Unfortunately, there is a significant disparity between published values of hydrogen solubility in pure aluminum and aluminum alloys. This is because the measurement of the extremely low soluble hydrogen concentration in aluminum and its alloys is experimentally difficult. Also, the reproducibility, accuracy, and reliability of the hydrogen solubility values are very sensitive to the measurement techniques, test conditions, chemical composition, and state of the aluminum sample. Thus, no serious discussion of the reliability of reported values of hydrogen solubility in aluminum and its alloys can be undertaken without a critical assessment of the fundamental principles of the experimental techniques used in the determination of the reported values. In this article, a critical review of the fundamental principles of the experimental techniques used in the measurement of hydrogen solubility in liquid and solid pure aluminum and aluminum alloys is presented. In addition, the reliability and possible accuracy of reported values of hydrogen solubility in solid and liquid pure aluminum are critically assessed. Empirical equations for calculating hydrogen solubility in liquid and solid pure aluminum as a function of temperature and pressure, derived from the most reliable sets of data are recommended. At 101.3 kPa (1 atm.) hydrogen partial pressure, the most reliable values of hydrogen solubility at the melting point (833 K) of pure aluminum are 0.71 cm3/100g (i.e., 6.32 × 10-5 wt.% H) and 0.043 cm3/100g (i.e., 3.81 × 10-6 wt.% H), in the liquid and solid state, respectively. So, the partition coefficient of hydrogen in pure aluminum is 0.061.