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of pentlandite using modified powder microelectrode with Acidithiobacillus ferrooxidans attached or without on the mineral powder surface. Cyclic voltammetry (CV) results show that at a low potential of about -0.2 V (vs SCE), the pentlandite was transformed to an intermediated phase like Fe4.5-yNi4.5-xS8-z when Fe and Ni ions were evacuated from mineral lattice; when the potential was changed from -0.2 V......
高饱和磁通密度Fe基非晶软磁合金研究进展陈国钧,牛永吉,彭伟峰,高春红北京北冶功能材料有限公司摘 要:简要评述了高饱和磁通密度,低铁损Fe基非晶合金领域的最新进展.重点介绍了新的FeSiBC系非晶合金2605HB1的最佳化学成分,磁特性,薄带质量和关键技术,用新发展的HB1铁心制备的试验配电变压器与用常规的FeSiB系非晶合金2605SA1铁心变压器相比,显示出铁损低,工作磁感高,可听噪音低和物理尺寸小等优点.关键词:Fe基非晶态合金;饱和磁通密度;铁损;配电变压器;......
, the feedstock consists of 53% (volume fraction) W-Ni-Fe powder with a D90 size of 5 μm and 47% (volume fraction) binder (mixture of polyethylene, wax and lubricant). Material data related to viscosity.... The viscosity model of the metal powder is the second order. According to the process requirement, the FE model (Fig.4), which is the two-part in one cavity geometrical model, realized by the software......
Fe掺杂的Ag-ZnO纳米复合材料的合成及光催化性能张嘉羲,袁欢,刘禹彤,陈雨,徐明西南民族大学电气信息工程学院信息材料四川省高校重点实验室摘 要:采用高分子网络凝胶工艺制备了Fe掺杂的Ag-ZnO系列纳米粉体.通过XRD,SEM,XPS,PL和UV-vis对所制备样品的微结构和光学性质进行了表征,随后以甲基橙和亚甲基蓝为模拟污染物,分别在模拟紫外光和模拟太阳光下对所制备的样品进行光催化测试.结果表明,Fe掺杂后,ZnO晶粒尺寸有所减小,且纳米Ag颗粒的分散性得到改善.样品中的Fe以Fe2+和Fe3+形式共存,随着Fe掺杂浓度的增加,ZnO晶格中的铁离子由+2价向+3价转变,导致PL光谱中蓝光发射峰强度降低.光催化测试结果表明样品Zn0.96Fe0.01Ag0.03O具有最好的光催化活性,结合样品的微......
DOI: 10.11817/j.issn.1672-7207.2017.12.006 微量Si和Fe对Al-Zn-Mg-Cu-Zr-Cr-Ti合金组织与性能的影响 周泽宇,陈康华,许杰,董朋轩 (中南大学 粉末冶金国家重点实验室,湖南 长沙,410083) 摘要:为了提高Al-Zn-Mg-Cu合金的力学性能及抗腐蚀性能,通过拉伸试验,晶间腐蚀,剥落腐蚀,应力腐蚀及电化学试验,并结合金相分析及高分辨电镜分析,研究微量Si和Fe的添加对Al-Zn-Mg-Cu-Zr-Cr-Ti合金组织与性能的影响.研究结果表明:微量元素的添加明显抑制合金的再结晶,使合金晶粒细小,亚结构稳定,强化合金,从而提高其力学性能及抗腐蚀性能,电化学循环极化曲线试验中自腐蚀电流密度的降低也与抗晶间腐蚀能力增强的结果较吻合；复合添加微量Si和Fe元素使合金基体中形成大量粗大黑色的Al7Cu2Fe相,与基体不共格,导致合金时......
配合浸取-沉淀分离-AAS测定风化黄铁矿水溶性盐中Fe(Ⅲ)和Fe(Ⅱ)张明浩,文兵,谢永习长沙有色金属专科学校摘 要:本文在近中性 phen 和 NH4Ac 的溶液中,浸取风化黄铁矿水溶性盐中Fe(Ⅱ)和 Fe(Ⅲ),调 pH2.2左右,在浸取液中加入 KSCN,使 Fe(Ⅲ)以离子缔合物沉淀与 Fe(Ⅱ)分离.用 AAS 测定分离前的总铁和分离后的亚铁,再求出 Fe(Ⅲ)的含量.方法适用范围广,灵敏度较高,准确度超过常见的物相分析.关键词:Fe(Ⅲ);Fe(Ⅱ);AAS;物相分析;......
] 银锐明, 范景莲, 刘勋, 等. 采用非均相沉淀-热还原法制备铁包覆氮化硅复合粉末[J]. 中南大学学报: 自然科学版, 2008, 39(1): 7-11.YIN Rui-ming, FAN Jing-lian, LIU Xun, et al. Preparation of Fe-coated Si3N4 composite powder by heterogeneous...液相之中,并能促使α-Si3N4转变为长条状β-Si3N4,而前面结果已经表明,Si3N4因为Fe原子进入其晶格而发生分解,材料中出现较多的Si液相,从而α-Si3N4可溶入Si液相后再析出长条状β-Si3N4. 图5 铁硅相图 Fig.5 Fe-Si phase diagram 在金属陶瓷中没有发现Si,这是因为Si最后被重新氮化,反应方程式如下: 3Si+2N2(g......
Trans. Nonferrous Met. Soc. China 30(2020) 2941-2951 Effect of Mn addition and refining process on Fe reduction of Mg-Mn alloys made from magnesium scrap Dong-dong GU1, Jia-wen WANG1, Yu-bin CHEN1... Materials, Chongqing Academy of Science and Technology, Chongqing 401123, China Received 14 January 2020; accepted 24 June 2020 Abstract: The Fe reduction, microstructure evolution and corrosion......
Al─Fe合金熔炼与铸造的工艺探讨温田文赣州铝厂摘 要:本文主要从化学成份,宏观组织,铸锭偏析以及铸造过程中的工艺参数,质量控制等方面,叙述了含铁量较高的Ａｌ─Ｆｅ合金在熔炼与铸造过程中的工艺性能以及工艺控制关键词:Al─Fe合金;铸造;熔炼;工艺;......
Behavior of Fe Powder During High-Energy Ball Milling Cooperated with Dielectric Barrier Discharge PlasmaLeyang DAIMarine Engineering Institute, Jimei University摘 要:In this study, nanostructured Fe powders were synthesized following 10 hours of high-energy ball milling with a superimposed dielectric barrier discharge plasma (DBDP). The mean size......
