共查询到20条相似文献,搜索用时 390 毫秒
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近日,河北钢铁集团宣钢技术中心创新化验方法,通过利用EMGA-930氧氮氢分析仪.可准确检测钢中氢含量,填补了一项技术空白。 相似文献
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依据GB 5274-2008《气体分析校准用混合气体的制备称量法》对氮中氢、氮中氧、氮中硫化氢标准气体的配制、定值及其不确定度进行了分析和阐述,讨论了影响测量不确定度的主要来源,该过程和方法可用于其他标准气体的配制和不确定度分析. 相似文献
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采用气相色谱等方法研究了非连续流动氢气中氧、氮对TiFe_(0.9)Mn_(0.1)合金贮氢性能的影响。结果表明,氢中低浓度氧对贮氢合金性能无明显的影响,氢中高浓度氧对贮氢合金有严重的毒化作用和氧毒化的不均匀性及热再生性。贮氢合金对氢气中低浓度氮具有浓缩作用,随放氢量的增加,氢中氮减少。氢气中高浓度氮具有阻止贮氢合金氢化的作用。 相似文献
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(1983年下半年一1985年上半年)国家」公产!品及生产_能力投资备空气产品及化学品}氧、氮、氢1,000万关元1953年一。月建成公司液氧气、氮氮、氢35ot/d100t/d佛蒙特州BOuntiful佛罗里达州氏lando不详1984年建,1986年初投产,供电 子、食品等工业用气氮120t/d得克萨斯州Austin数百万美元1984年1月建,6月投产供半 导体工业用氧、氮、氢l,300t/d路易斯安那州4,O。。万美元1984年10月投产高纯氢750,000,ooofts/a加利福尼亚州Sacra- 功en加数百万美元1984年9月建,1956年上半年完 工、占该公司生产能力10务高纯氢路易斯安那州新奥尔良1100。万美元… 相似文献
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干法球磨从废铝边角料中制取片状铝粉工艺研究 总被引:2,自引:0,他引:2
对在氮气惰性气氛下,利用废弃铝边角料生产片状铝粉的可行性进行了研究。发现在球磨过程中,废铝片通过钢球的微锻作用相互挤压分层,延展,细碎,最后形成片状铝粉,球罐中的钢球球径大小与片状铝粉的产出性能有着重要的关系,球径大的钢球研磨对铝粉的形成更有利;在球磨的前25h,适当次数的间歇停机冷却球罐可以提高铝粉的细度;硬脂酸的加入可以减少铝粉与铝粉,铝粉与钢球或罐壁的摩擦,降低球磨效率,加入3%的硬脂酸作为助磨剂球磨效果最佳。所得片状铝粉可用于指纹鉴定、加气节能混凝土等。 相似文献
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Chen Fuwang Huang Xuebing Zhang Yun Liu Yulin Hu Zhuangqi 《Materials at High Temperatures》2013,30(4):421-424
Two different ways of combining nitrogen in virgin and revert superalloy have been identified. The source of nitrogen in revert superalloy has been ascertained. It is found that nitrogen in scraps of virgin superalloy undergoes a transition from CrN to TiN when these scraps are remelted in VIM furnace. High nitrogen content in revert superalloys causes microporosity formation, that greatly deteriorates tensile and stress rupture properties of superalloys. 相似文献
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N. J. Welham 《Journal of Materials Science》2001,36(9):2343-2348
The generally accepted method for recovering oxygen on an extraterrestrial body is by thermal reduction of indigenous minerals, the most amenable of which is ilmenite, FeTiO3. Thermodynamic modelling shows that carbon is a more effective reductant than hydrogen. In this paper the effect of extended ball milling on the carbothermic reduction of a terrestrial beach sand derived ilmenite is examined. The rate of oxygen recovery into the gas phase is substantially faster for powders milled together and a concomitent lowering of onset temperature is also noted. XRD examination of the final powders indicate that reduction of ilmenite proceeds via elemental iron and rutile which is then further reduced to sub-oxides. The presence of nitrogen, or excess carbon, leads to vastly greater oxygen recovery due to the formation of titanium nitride or carbide with complete release of oxygen from the mineral achieved in 1 h at 1200°C. 相似文献
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以Gd2O3和NH4HF2为原料,利用TG-DTA分析方法和控制变量实验方法,研究了氟化氢铵氟化法合成氟化钆过程的反应机理,考察了系统压力、温度、时间和原料摩尔比对氟化率、氟含量、氧含量和氮含量的影响规律.研究表明:合成过程包括NH4GdF4的低温缓慢合成反应、NH4HF2熔化后的NH4GdF4快速合成反应和高温时的NH4GdF4分解反应;氟化过程系统压力增加,氟化率和氟含量增加,氧含量降低,氮含量增加;温度升高,氟化率和氟含量增加,氧含量先降后升;氧含量随摩尔比增加而减少,氟含量随摩尔比增加而增大. 相似文献
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This study examined the effects of the mechanical milling conditions on the hydrogen adsorption behaviors of graphite flakes under different gas streams. A ball mill technique with various gas streams during treatments was used to introduce oxygen-containing functional groups on the graphite surfaces. The structural properties of graphite were evaluated by XRD, and the surface properties and textural properties were observed SEM, FT-IR, XPS and N2/77 K adsorption isotherms. The hydrogen adsorption behavior of the graphite flakes were evaluated using a volumetric method at room temperature and 100 atm. The mechanically-milled graphite flakes under an oxygen stream showed a higher concentration of oxygen functional groups and greater hydrogen adsorption capacity than that of graphite flakes under an argon stream. This suggests that oxygen functional groups have good chemical affinity with hydrogen molecules in this system. 相似文献
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采用气相色谱仪的热导检测器,以氩气为载气,可对氮气中氢,氧的含量进行测定,文中通过对色谱仪的试验条件,如柱温,检测器的温度,桥流大小,载气流速及进样量等进行选择,确定了氢,氧,氮的最佳分析条件,本方法对氩,氧的最小检出量分别为0.002%,0.02%。 相似文献
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《Materials Letters》1988,7(4):131-133
Knowledge of impurities in thin films is important for fabrication and characterization of photovoltaic devices. The lightimpurity distribution in electrodeposited CuInSe2 thin films has been investigated by an elastic recoil detection method using a 30 MeV 35Cl beam and identifying the recoil masses using a time-of-flight technique. It was found that both oxygen and hydrogen were present and distributed uniformly throughout the thickness studied. Upper limits for carbon and nitrogen were also established. The energy spectra for oxygen and hydrogen were deconvolved to obtain the relative concentrations as a function of depth. Using the same technique, the compositional uniformity of Cu, In and Se was also determined, yielding results qualitatively consistent with that obtained by secondary ion mass spectroscopy. 相似文献