检索结果-南通市图书馆

Electrochemical Synthesis of Chromium Silicides from Molten Salts

Journal of Chemistry and Chemical Engineering 2014年第9期8卷 845-848页

作者： Liliia Molotovska dmytro shakhnin Oleksandr Podyman Viktor Malyshev Nataliya Uskova Viliam Pavlik Vernadsky Institute of General and Inorganic Chemistry of the NAS (National Academy of Science) of Ukraine Kiev 03142Ukraine Institute of lnorganic Chemistry Slovak Academy of Sciences Bratislava 994536 Slovak Republic

Electrochemical synthesis of chromium silicides from NaCl-KCl-K2SiF6-CrF3 system has been investigated by cyclic voltammetry and DC (direct current) electrolysis at 850 oC. The process of Cr and Si joint electroreduction in chloride-fluoride melt proceeds in one stage in a kinetic mode. The cathode product was analyzed using XRD (X-ray diffraction) method. XRD data have confirmed that Cr3Si is the dominant phase. SEM (scanning electron microscopy) results have shown that Cr3Si powder samples consist of 50-150 μm particles and that tungsten silicide was formed at the surface of tungsten cathode after chrome-free system electrolysis.

关键词：电化学合成硅化物铬系扫描电子显微镜 X射线衍射 Cr3Si 熔盐循环伏安法

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tungsten Resource-Saving： Cobalt Cermets Wastes Recycling and Concentrates Extraction

引用

Journal of Environmental Science and Engineering(B) 2015年第10期4卷 521-528页

作者： Viktor Malyshev dmytro shakhnin Angelina Gab Nataliya Uskova Oleksandr Gudymenko Volodymyr Glushakov Nina Kushchevska Department of Physical Chemistry of Ionic Liquids EL Vernadsky Institute of General and Inorganic Chemistry National Academy of Sciences of Ukraine Kyiv 03142 Ukraine Faculty of Chemistry & Technology National Technical University of Ukraine "Kyiv Polytechnical Institute" Kyiv 03056 Ukraine Faculty of Engineering & Technology University "Ukraine" Kyiv 03115 Ukraine

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis of VIB Group Metals Silicides Dispersed Powders by Electrolysis of Halide-Oxide Melts

引用

Journal of Chemistry and Chemical Engineering 2016年第1期10卷 7-12页

作者： Liliia Molotovska dmytro shakhnin Natalia Uskova Ganna Nikulina Vladymyr Cherednik Serge Stukota Viktor Malyshev Department of Physical Chemistry of lonic Liquids V. I. Vernadsky Institute of General and Inorganic Chemistry National Academy of Sciences of Ukraine 32/34 Palladina Ave. Kyiv 03142 Ukraine Faculty of Engineering & Technology University of Ukraine 23 L vivska St. Kyiv 03115 Ukraine

Study of electrochemical behavior of chromium (molybdenum, tungsten) and silicon containing melts allowed defining conditions for synthesis of silicides of chromium, molybdenum and tungsten in the form of fine powders by electrolysis of halide-oxide melts. Sequence of stages of electrosynthesis of silicides of molybdenum and tungsten was found as follows: deposition of more electropositive metal (molybdenum or tungsten), deposition of the second component (silicon) on the surface of metal deposited previously, and reaction diffusion of silicon into the deep of the metal-salt "pear" with the formation of silicide phases of different compositions up to the higher silicides. In contrast, during the electrodeposition of chromium silicides, one of the components (chromium) is deposited not in elemental form, but in oxide form, and the other (silicon) acts as a reducing agent for this oxide to form binary compounds. Duration of the synthesis first stage (deposition of refractory metal or of its oxide) depends on the refractory metal compound content in the system and on the cathode current density. Synthesis of silicides is possible due to retention of powders of molybdenum (tungsten) or chromium oxide at the cathode without scaling. Optimal values of concentrations ratio, current density, temperature, and duration of electrosynthesis were found. Phase composition of products were obtained, as well as their chemical and thermal stability, were studied.

关键词：金属硅化物氧化物电解合成条件粉末融化阴极电流密度电沉积过程分散

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：