泡沫镍电极的制备和电性能研究

以球型氢氧化亚镍粉末为活性物质，研究了导电剂，粘合剂等因素对泡沫镍电极性能的影响，通过实验找出诸因素与活性物质之间的最佳配比，得到用球型亚镍作为泡沫镍电极活性物质的适宜的工艺条件，为球型亚镍的使用提供了参考数据。     

球形硅微粉的微观结构研究

文章采用XRD、SEM研究了球型硅微粉的晶体结构和微观结构。XRD测试晶体结构,发现高温熔融喷射法制备的球型硅微粉里面有晶态石英存在;SEM分析微观结构发现高温熔融喷射法制备的部分球型硅微粉颗粒内部有孔洞存在。通过对晶体结构和微观结构进行分析,找到了高温熔融喷射法生产的球型硅微粉内结晶态存在的原因。     

溶胶-凝胶法制备油脂加氢催化剂的研究

采用溶胶－凝胶法，制备了可用于食用油脂加氢的单元镍催化剂，研究了催化剂制备方法对催化剂镍含量的影响及镍含量的变化对活性的影响。研究表明：镍含量最佳值在20％左右，催化剂的活性随镍含量增加而提高，采用乙醇代替水洗可有效提高催化剂的镍含量和催化活性。     

FC-32A齿球型加氢裂化催化剂生产及工业应用

介绍了抚顺石油化工研究院（FRIPP）研制开发的FC-32A齿球型催化剂生产过程及工业应用结果。结果表明,采用专有齿球制备技术,能有效地解决齿球型催化剂制备过程中的难点,其物化性质和实验室结果吻合,说明催化剂抚顺分公司专有制备技术已成熟,能满足现有生产技术要求,制备工艺无特殊环保要求。FC-32A齿球型催化剂在中海油舟山石化有限公司170万t/a馏分油加氢装置进行工业应用,装置运转初期表明,催化剂装填效果较好,反应器总压降0.17 MPa,略低于上周期的0.20 MPa,齿球型催化剂反应器的径向温差小于3℃,装置目的产品的主要性质均满足企业的要求。     

球形超细HMX的制备

采用物理研磨法制备了微米级球形HMX粉体，并对其性能进行了研究，实验证明，采用物理研磨法可使HMX形成类球型，并达到了提高炸药抗冲击性能，提高装填密度的目的。     

催化剂中镍含量对CVD法制备碳纳米管的影响

为了提高CVD法（低温催化裂解烷烃类气体法）制备碳纳米管的产率，研究了镍/硅藻土催化剂的镍含量对制备碳纳米管的影响。采用透射电子显微镜（TEM）对还原后的催化剂和产物碳纳米管进行了分析。结果表明，催化剂中镍含量在一定范围内（6.4%-25.9%)，随着镍含量增加，催化剂活性提高，碳纳米管产率提高。但随镍含量的继续增加，催化剂的活性开始下降，碳纳米管的产率也相应下降。     

高氯酸镍制备方法的改进

高氯酸镍制备方法的改进乐学义，毋福海，宋粉云，计亮年（中山大学化学系，广州５１０２７５）分析纯无钻（含量＜０．００２％）高氯酸镍是一种重要的化学试剂，可用于制备其他镍的化合物以及研究镍的化学性质（如配位反应）等。目前主要通过硝酸盐来制备［１］。笔者对...     

用废镍催化剂制备氧化镍的研究

以废雷尼镍催化剂为原料制备出合格的氧化亚镍。确定了合适的工艺条件，镍的回收率达９３％以上。     

球形BiVO_4光催化剂的制备及光催化性能

以Bi(NO_3)_2·5H_2O和NH_4VO_3为原料,采用微乳液法制备球型BiVO_4光催化剂。用亚甲基蓝溶液模拟有机废水,在紫外光照下,研究亚甲基蓝的光催化降解过程。利用X射线衍射和扫描电子显微镜等测试技术,对球型BiVO_4光催化剂进行表征。结果表明,乳液法制备的球型BiVO_4光催化剂具有良好的光催化性能,对亚甲基蓝的光降解率几乎可达100%。     

节能析氢电极的研究

用电镀法制备了镍－钼析氢电极，考察了制备条件对该电极析氢活性的影响。本文实验条件下，镀液中钼与镍的原子比为1：2，电镀电流密度为18mA·cm－2时，制备的镍－钼电极有较高的折氢活性。与现行氯碱电解槽的低碳钢网析氢电极比较，析氢过电位降低0．116V。     

Preparation and properties of foam ceramic from nickel slag and waste glass powder

The utilisation of nickel slag and waste glass powder as raw materials for preparing foamed ceramic was studied. The influences of the mixture design and foaming-agent dosage on the properties and microstructures of foamed ceramic were investigated in terms of the density, flexural strength, phase composition and micromorphology. Results showed that incorporating nickel slag improved the flexural strength and uniformity of the pore structure. However, owing to the high density of nickel slag, its excessive usage may impact the development of foamed ceramic density and porosity as a side effect. The Na₂CO₃ dosage was another crucial factor determining foamed ceramic properties. A nickel slag content of was 20% and a Na₂CO₃ content of 7% decreased the foamed ceramic density to 0.498 g/cm³, with a corresponding flexural strength of 2.66 MPa and a higher porosity of 80.06%.     

Preparation and characterization of core‐shell PS/Ni composite microspheres

PS/Ni microspheres were prepared by electroless nickel plating on PS microspheres. Several parameters for plating were optimized in order to obtain integrated and uniform nickel coatings. The properties of obtained composite microspheres, such as chemical composition and crystal texture of the coating, mechanical property, density, and magnetism, were characterized by SEM, EDS, XRD, and VSM. It was revealed that several parameters, such as thiourea dosage, reaction temperature, and load, had significant influence on fabrication of integrated and homogeneous nickel shell. It was also demonstrated that the properties of the PS/Ni microspheres, such as nickel weight ratio, density, and magnetism, can be tuned by adjusting the load. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

Preparation and characterization of porous ceramics from nickel smelting slag and metakaolin

Porous ceramics with high porosity and low bulk density were prepared by using nickel slag and metakaolin as the primary raw materials, glass powder as flux, and SiC as the foaming agent. The content of nickel slag and foaming agent had a significant effect on the bulk density, porosity, and flexural strength of the porous ceramics. The porous ceramics with the best properties were obtained at 1100 °C for 30 min with 50 wt% nickel slag, 40 wt% metakaolin, 10 wt% waste glass, and 0.8 wt% SiC. It had a low bulk density (as low as 245 kg/m³), high flexural strength and compressive strength (0.6 MPa and 1.17 MPa, respectively), and high porosity (about 89.8%). The nickel slag was magnetically separated as well. The density of nickel slag powder could be reduced via magnetic separation, and there was no significant change in the crystal structure of the raw material. Compared with porous ceramics prepared using nickel slag without magnetic separation, ceramics subjected to magnetic separation had lower bulk density, higher porosity, and the same phase composition. This study can be used as an indicator for the application of nickel slag in porous ceramics, which is of great significance in providing a great substitute nickel slag towards recovery and utilization.     

γ射线辐射法制备石墨/镍复合材料及其电磁性能

为提高鳞片状石墨在电磁波吸收方面的应用性能,采用γ辐射一步法制备了鳞片状石墨/镍复合材料。实验在常温常压下进行,将鳞片状石墨置于镍盐溶液内,控制溶液的镍盐浓度,再加入氧化性自由基清除剂并将该混合溶液置于钴60辐照室辐照,获得了纳米金属镍包覆在鳞片状石墨表面的复合材料。通过XRD、SEM对复合材料进行了结构和形貌的表征,复合材料为核壳结构、由纯纳米镍与石墨构成,同时提出了γ辐射法合成该复合材料的复合机理,并且研究了复合材料在2～18GHz频段的电磁性能。     

镍渣基泡沫玻璃的制备及其性能研究

以镍渣和废玻璃作为主要原料,使用Na2CO3为发泡剂,采用模具装填法来烧制泡沫玻璃.研究了镍渣的掺量、发泡剂掺量、发泡温度和发泡时间对泡沫玻璃的气孔结构和相关力学性能的影响.研究表明:镍渣掺量减少,Na2CO3掺量增加和发泡温度的升高,均会降低泡沫玻璃的体积密度,提高样品的平均气孔直径;镍渣掺量对泡沫玻璃的组成成分和晶体种类没有明显的影响;以20%镍渣和80%玻璃粉为主料,5%~7%Na2CO3为发泡剂,在发泡温度870 ℃下保温60 min,可以制备出气孔率为85.14%,体积密度为0.3715 g/cm3,抗折强度为2.062 MPa,平均气孔直径在3.13 mm的镍渣基泡沫玻璃.     

Variation of the morphological and the catalytic properties of active carbon-nickel catalysts

The relation between the morphological and the catalytic properties of active carbon-nickel catalysts was investigated in connection with using these catalysts as cathodes in air-zinc cells. The samples, containing different amounts of deposited nickel nitrate were activated in carbon dioxide. During the process of activation changes in texture porosity, surface area and helium density appeared. These properties are discussed in relation to the catalytic activity of the active carbon-nickel catalysts. It was found that the properties mentioned above may be modified according to the nickel content. The dispersion and the texture of nickel on the surface of active carbon were examined by scanning electron microscopy.     

Understanding how yttrium doping influences the properties of nickel ferrite – Combined experimental and computational study

Activation energies of nickel ferrite samples containing different amounts of yttrium (Y) were experimentally determined. In order to understand the influence of Y ions to selected properties of nickel ferrite, a computational analysis based on density functional theory (DFT) calculations has been performed. DFT calculations provided deeper understanding of the structural effects introduced by the presence of Y ions and contributed to the explanations of conductivity. In order to track the changes in magnetic properties, spin polarized formalism was adopted, which enabled us to assess to what extent Y doping might influence the magnetic properties of nickel ferrite. Band structure calculations have been performed in order to obtain information about band gaps, while analysis of total and partial density of states (TDOS and PDOS, respectively) have indicated the overall contribution of different states and Y ion.     

Crystallographic textures and magnetic properties of electroformed nickel

The magnetic properties of nickel deposits are known to be related to their crystallographic textures. Although there has been significant work investigating the relationship between crystallographic textures and magnetic properties of sputtered ferro-magnetic films, relatively less effort has been spent on studying electroformed nickels. Orientation distribution functions and coercivity of the nickel deposits, electroformed by using a nickel sulphamate bath and pulse-reverse currents, have been determined and their relationship examined. It was found that the [100] fibre texture with different orientation densities was formed at different on-times and off-times, and that at the same deposition thickness the coercivity increased with increase in the orientation density of the [100] fibre texture. This findings are of high significance as they can serve as guidelines for the production of nickel deposits with defined magnetic properties through the control of crystallographic te xture by varying the pulse parameters in pulse-reverse current electroforming.     

石英光纤表面镍-磷-硼预镀层上电镀厚镍的响应面法研究

采用响应面法对石英光纤表面Ni-P-B预镀层上电镀厚镍进行了研究.建立了以六水合硫酸镍质量浓度、十二烷基硫酸钠质量浓度、氧化镧质量浓度和电流密度为因变量,以镍沉积速率为响应值的二次多项式模型,其预测值与实验值吻合度较好.在六水合硫酸镍质量浓度为220 g/L,十二烷基硫酸钠质量浓度为0.08 g/L,氧化镧质量浓度为0...     

Ni—LDPE复合材料的研究

报道了Ni-LDPE复合材料中镍粉含量对材料的导电性及力学性能影响的研究结果。实验表明,在低密度聚乙烯中加入片状镍粉以后,随着镍粉含量的增加,导电性上升,但力学强度先上升后下降。在镍粉体积分数为8％～15％时,电阻率急剧下降,然而力学强度仍然上升,直至达最大值后才急剧下降。这说明,在此期间镍粒子之间巳能充分接近、接触,形成导电通路;但是,如果聚乙烯份量太少,镍粒子被润湿、粘结不充分时,力学强度就会恶化。总之,复合材料的结构对其导电性及力学强度同时产生强烈的影响。