Hydrogen in Ce2Ni1−xSi1+x and Ce6Ni2Si3 compounds

Hydrogen interaction with Ce₂Ni_0.8Si_1.2,Ce₂NiSi, Ce₂Ni_1.2Si_0.8 and Ce₆Ni₂Si₃ compounds were studied. The new hydride phases containing 3.7, 4.4, 4.9,and 10.9 hydrogen atoms per formula unit correspondingly, have been synthesized andcharacterized by X-ray diffraction and thermodesorption methods. All hydrides preservedstructure type of the starting compounds with pronounced anisotropic distortion of crystal lattice.Some suggestions on hydrogen localization in interstitial sites have been proposed.     

17Cr2Ni2MoA渗碳淬火回火的工艺研究

采用小滴量滴注法，对17Cr2Ni2MoA渗碳淬火回火工艺进行了研究，总结出了渗碳工艺，淬火回火工艺。确认通氮气排出炉内的空气能缩短渗碳时间，采用金相组织法估测硬化层深度和碳化物的状况。     

1Cr17Ni2钢的热处理性能研究

通过对 1Cr17Ni2不锈钢相区变化的分析 ,从理论上阐述了 1Cr17Ni2钢的热处理的机理 ,并通过实例给出了能够同时使 1Cr17Ni2钢获得高强度和高韧性的热处理方法     

1Cr12Ni2WMoVNbN材料热处理工艺研究

通过试验研究摸索了1Cr12Ni2WMoVNbN材料的机械性能和微观金相组织特性,确定了最佳热处理工艺。     

催化剂Ni/CeO2-ZrO2催化生物油水溶性组分重整制氢

利用固定床反应器对一系列自制催化剂Ni/CeO2-ZrO2和商业镍基催化剂Z417在生物油水溶性组分重整制氢反应中的催化性能进行考察,研究了活性金属Ni的负载量、反应温度、水油比对催化剂活性的影响.实验结果表明:Ni负载量为12wt％的催化剂Ni/CeO2-ZrO2在生物油水溶性组分重整制氢反应中表现出最佳催化活性,当反应温度为800C和水油比为4.9时,氢产率达到最大值67.8％,氢的选择性较高,为61.8％.     

Photocatalytic hydrogen production enhancement of Z-Scheme CdS quantum dots/Ni2P/Black Ti3+–TiO2 nanotubes with dual-functional Ni2P nanosheets

The Z-Scheme CdS quantum dots/Ni₂P/Black Ti³⁺–TiO₂ nanotubes with dual-functional Ni₂P nanosheets are fabricated by a continuously electrospinning-annealing/reduction-chemical deposition method, there, the TiO₂ nanotubes are fabricated via electrospinning, subsequently, the 2D Ni₂P lamellas grow on the surface of nanotubes and the Ti³⁺/O_v ions are introduced by reduction, then CdS QDs are deposited on the surface of Ni₂P lamellas. Evaluated by the photocatalytic hydrogen production, the photocatalytic performance of Z-Scheme CdS QDs/Ni₂P/B–TiO₂(~3303.85 μmol/g h) exhibits an obvious enhancement of about ~70 folds than unmodified TiO₂. The main reasons for the HER enhancement are ascribed to that the Pt-like behavior 2D Ni₂P and Ti³⁺ ions can accelerate the photo-generated electrons diffusing into water and reduce H₂ activation barrier, the Z-Scheme heterojunction can accelerate the separating and transferring of photo-generated charge carriers, the O_v ions and hollow nanotubes can increase solar utilization, which can be supported by the electrochemical measurements.     

Ni/La2O3 and Ni/MgO–La2O3 catalysts for the decomposition of NH3 into hydrogen

The decomposition of NH₃ for hydrogen production was studied using Ni/La₂O₃ catalysts at varying compositions and temperatures prepared via surfactant-templated synthesis to elucidate the influence of catalyst active metal content, support composition and calcination temperature on the catalytic activity. The catalytic performance of all samples was studied between 300 and 600 °C under atmospheric pressure. The catalytic activity of the sample were as follows: 10Ni/La₂O₃-450 > 10Ni/La₂O₃-550 > 10Ni/La₂O₃-650 ≈ 10Ni/La₂O₃-750 ≈ 10Ni/La₂O₃-850. The excellent activity (100%) of 10Ni/La₂O₃-450 could be due to the high surface area, basicity strength and concentration of surface oxygen species of the catalyst as evidenced by BET, CO₂-TPD and XPS. In addition, to adjust the activity of the catalyst support, the molar ratios of Mg and La were varied (1:1, 3:1, 5:1, 7:1 and 9:1). The 5Ni/5MgLa (5:1 M ratio) was found to be the most active (100%) relative to other Ni/MgLa formulations. Furthermore, the Ni content in the Ni/5MgLa sample was adjusted between 10 and 40 wt%. Increasing the Ni content of the catalysts increased NH₃ conversion with the 40 wt% Ni formulation demonstrating complete NH₃ conversion at 600 °C and a high gas hourly space velocities (GHSV) (30,000 mL∙h⁻¹∙g_cat⁻¹).     

The electrochemical behavior of Ni–MH battery,Ni(OH)2 electrode and metal hydride electrode

In the past years, the nickel–metal hydride rechargeable battery is already been widely used in many application fields, and is now replacing the nickel–cadmium battery. Electrochemical impedance spectroscopy technique is extensively used to reveal the electrode process kinetics, for example, Pb–H₂SO₄ battery, Ni–Cd battery. There are few reports on the EIS of Ni–MH battery. In this paper, an extensive study is focused on the electrochemical impedance spectroscopy of metal hydride electrode, β–Ni(OH)₂ electrode and Ni–MH battery with different states of charge.     

2Cr12Ni2W1Mo1V长叶片钢研制报告

文章介绍了大功率汽轮机末级叶片材料应具备的优良特性；     

Isotopic effects and dehydriding kinetics in the Mg2NiH2(D2) system

Measurements of the equilibrium isotopic effects in the Mg₂Ni-hydrogen (deuterium) system are reported. The values of the enthalpies of transformation for the absorption and desorption reactions are critically compared to literature data. The dehydriding kinetics are studied, concluding that the reaction progresses by a nucleation and growth mechanism, with the hydrogen (deuterium) diffusion in the α-phase as a rate limiting process at high thermodynamic driving forces. The role of the hydride-solid solution (β/α) interface increases as the pressure approaches a value P_o, lower than the equilibrium dissociation pressure. At pressure above this P_o, the process becomes interface-controlled and an incubation time is observed in the dehydriding reactions. The activation energy for the hydrogen diffusion in α-phase has been tentatively evaluated from the kinetic data and compared to that reported in literature.     

25Cr2Ni4MoV质量控制技术的应用实践

25Cr2Ni4MoV由于用途的特殊性要求钢中含有尽可能低的夹杂物,在生产实际中,由于夹杂物而引起报废的情况屡见不鲜。因此必须对其产生、危害及控制进行研究并在实践中应用,以提高纯洁度和使用性能。     

18Cr2Ni4WA钢氮化新工艺的研究

通过热处理工艺试验研究，比较在不同的氮化温度及时间条件下的氮化效果，制定出适合18Cr2Ni4WA材料的合理的氮化工艺参数。     

１Cr17Ni2钢的热处理的性能研究

通过对１Cr17Ni2不锈钢相区变化的分析,从理论上阐述了１Cr17Ni2钢的热处理的机理,并通过实例给出了能够同时使１Cr17Ni2钢获和高韧性的热处理方法。     

Mechanically alloyed Mg2Ni for metal-hydride–air secondary battery

Mechanically alloyed Mg₂Ni and a single air (oxygen) electrode are used as the anode and cathode, respectively, in a Mg₂Ni|6 M KOH|O₂ rechargeable metal-hydride–air (MH–air) battery. The battery is tested for self-discharge by measuring the open-circuit voltage (OCV) and cycling characteristics. Battery degradation after charge–discharge cycling is characterized by means of X-ray diffraction (XRD) and scanning electron microscopic (SEM) analyses.     

Preparation and characterization of LiNiO2 synthesized from Ni(OH)2 and LiOH·H2O

Synthesis of LiNiO₂ by heat-treatment of Li(OH)·H₂O and Ni(OH)₂ is reported. The influence of synthesis conditions on the electrochemical performance of the resulting LiNiO₂ is investigated. Thermal analysis of the synthesis process shows that LiNiO₂ formation proceeds through the transformation of Ni(OH)₂ to a layered compound Ni_1−x(OH)_2−x, followed by solid reaction with LiOH. The most favorable condition is heating a mixture of Li(OH)·H₂O and Ni(OH)₂ at 650°C, and then at 720°C in oxygen. The resulting LiNiO₂ exhibits a considerably high discharge capacity of 145 mA h g⁻¹ and a sufficiently long cycle-life when cycled over a lithium composition range of 0.2≤x≤0.65.     

新焊接转子材料25Cr2Ni2MoV钢的试制及其性能试验

回顾了上汽厂汽轮机低压焊接转子材料的发展,介绍了屈服强度≥700MPa的新焊接转子材料25Cr2Ni2MoV的基本特性,通过模拟轮盘锻件试制和解剖试验,测定了新材料的显微组织、力学性能、FATT、室温断裂韧度和钢的连续冷却转变曲线,进行了时效试验、应力腐蚀试验和焊接工艺试验等,结果表明该材料具有良好的淬透性和综合性能,能满足百万等级超超临界汽轮机及核电低压焊接转子的设计和使用要求.     

Ni–SiO2 and Ni–Fe–SiO2 catalysts for methane decomposition to prepare hydrogen and carbon filaments

Active and stable Ni–Fe–SiO₂ catalysts prepared by sol–gel method were employed for direct decomposition of undiluted methane to produce hydrogen and carbon filaments at 823 K and 923 K. The results indicated that the lifetime of Ni–Fe–SiO₂ catalysts was much longer than Ni–SiO₂ catalyst at a higher reaction temperature such as 923 K, however, a reverse trend was shown when methane decomposition took place at a lower reaction temperature such as 823 K. XRD studies suggested that iron atoms had entered into the Ni lattice and Ni–Fe alloy was formed in Ni–Fe–SiO₂ catalysts. The structure of the carbon filaments generated over Ni–SiO₂ and Ni–Fe–SiO₂ was quite different. TEM studies showed that “multi-walled” carbon filaments were formed over 75%Ni–25%SiO₂ catalyst, while “bamboo-shaped” carbon filaments generated over 35%Ni–40%Fe–25%SiO₂ catalysts at 923 K. Raman spectra of the generated carbons demonstrated that the graphitic order of the “multi-walled” carbon filaments was lower than that of the “bamboo-shaped” carbon filaments.     

1Cr17Ni2不锈钢平衡组织的预测及控制

1Cr 17Ni2不锈钢属于火电大机组零部件所采用的材料之一,因其组织中易产生铁素体而使钢的热加工工艺性能和热处理工艺性能下降。采用Thermo Calc软件对不同条件下1Cr 17Ni2不锈钢的平衡组织进行了定量计算,分析了温度和化学成分两因素对钢的平衡组织的影响规律,在此基础上提出了1Cr 17Ni2 不锈钢化学成分的控制范围和热加工及热处理的温度规范。结果表明,Thermo Calc预测结果与现有试验数据基本上吻合,可以用于指导1Cr 17Ni2 不锈钢的生产和使用。表1参9     

碳钢表面激光熔敷Ni基Cr3C2／（Ni＋Cr）复合涂层的研究

使用2kw连续波CO2激光器在45^#钢表面进行激光熔敷Ni合金中添加50wt%Ni Cr包敷的Cr3C2复合粉的复合少层，并对激光熔敷层的晶体生长形态、物相和硬度进行了分析。结果表明：熔敷层由下至上可分为平面前沿生长区，胸状晶区及枝晶：熔敷区的近表层由高度细小的奥氏体枝晶和C7C3、Cr3C2等物组成，熔敷层的硬度平均高达HV0.2950-1200。添加Cr3C2粒子的激光熔敷层的显微硬度比镍基合金的显微硬度平均提高了HV0.2300。     

La2O3改进Ni/γ-Al2O3催化剂上沼气重整制氢

为了寻求制备氢气的可再生资源及减少沼气的排放量,用浸渍法制备了不同La2O3含量的Ni/La2O3/γ Al2O3催化剂,用CH4/CO2体积比为1的混合气体模拟沼气,考察了还原温度、反应温度、空速等操作条件对该催化剂上沼气重整制氢性能的影响.并运用H2-TPR、TEM、TG-DSC等对催化剂进行了表征.结果表明:La2O3含量为6%的催化剂具有较好的综合性能;载体中掺杂适量La2O3能增加金属Ni的分散性,提高催化剂的可还原性及载体对CO2的吸附能力,从而改善了催化剂的活性及抗积炭性,使催化剂具有较好的稳定性.在100h的稳定性实验中,CH4及CO2转化率、H2及CO的选择性、H2/CO比平均值分别约为87.4%、88.8%、87.3%、93.8%及0.92.催化剂表面积炭速率非常低,仅为0.7279mg/(gcat·h).