scholarly journals Carbon-Coated Nanopowder as Sintering Aid for Water-Atomized Iron Powder

2022 ◽  
Author(s):  
Swathi Kiranmayee Manchili ◽  
Fang Liu ◽  
Eduard Hryha ◽  
Lars Nyborg
Keyword(s):  
Iron Oxide ◽  
Iron Powder ◽  
Carbon Coating ◽  
Linear Shrinkage ◽  
Core Shell ◽  
Pure Hydrogen ◽  
Sintering Aid ◽  
Carbon Coated ◽  
Core Shell Structure ◽  
Reduced Surface

Abstract The influence of carbon coating on the nanopowder when used as a sintering aid for water-atomized iron powder is explored. Iron nanopowder without such a coating was used as a reference sintering aid to isolate and depict the influence of the carbon coating. Both nanopowder variants were characterized using XPS and HRTEM, and the results showed a core-shell structure for both nanopowder variants. Iron nanopowder is covered by a 3-4 nm thick iron oxide layer, while the carbon-coated nanopowder is encapsulated with a number of nanometric carbon layers. Thermogravimetry carried out in a pure hydrogen environment shows a multipeak behaviour for carbon-coated nanopowder, while a single peak behaviour is observed for the iron nanopowder. This difference was correlated with chemical analysis. Two types of micro/nanobimodal powders were obtained by mixing the nanopowder with water-atomized iron powder. An improved linear shrinkage was observed when carbon-coated iron nanopowder was added. This can be explained by the reduced surface diffusion in the nanopowder due to the carbon coating, which allows the nanopowder to sinter at higher temperatures and improves densification.

Ultrathin carbon-coated Fe7S8 core/shell nanosheets towards superb Na storage in both ether and ester electrolyte systems

2019 ◽  
Vol 3 (10) ◽  
pp. 2845-2858 ◽  
Author(s):  
Zhao Xiong ◽  
Masayoshi Fuji ◽  
Jisheng Zhou
Keyword(s):  
Shell Structure ◽  
Oriented Attachment ◽  
Core Shell ◽  
Carbon Coated ◽  
Core Shell Structure ◽  
Storage Properties

Ultrathin Fe7S8@CNS nanosheets with a 2-D core/shell structure were synthesized based on oriented attachment growth and exhibited superior Na storage properties.

Synthesis of micron particles with Fe–Fe4N core–shell structure at low-temperature gaseous nitriding of iron powder in a stream of ammonia

2016 ◽  
Vol 7 (2) ◽  
pp. 303-309 ◽  
Author(s):  
A. G. Gnedovets ◽  
A. B. Ankudinov ◽  
V. A. Zelenskii ◽  
E. P. Kovalev ◽  
H. Wisniewska-Weinert ◽  
...  
Keyword(s):  
Low Temperature ◽  
Iron Powder ◽  
Shell Structure ◽  
Core Shell ◽  
Gaseous Nitriding ◽  
Core Shell Structure

Synthesis of ketoxime-functionalized Fe3O4@C core–shell magnetic microspheres for enhanced uranium(vi) removal

RSC Advances ◽  
2016 ◽  
Vol 6 (26) ◽  
pp. 22179-22186 ◽  
Author(s):  
Qi Liu ◽  
Wenting Li ◽  
Wei Zhao ◽  
Lichao Tan ◽  
Xiaoyan Jing ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Adsorption Property ◽  
Magnetic Microspheres ◽  
Core Shell ◽  
Carbon Coated

Ketoxime-functionalized carbon coated iron oxide (Fe3O4@C–KO) was synthesized and characterized. The adsorption property of uranium was also investigated.

scholarly journals Erratum to: “Synthesis of micron particles with Fe–Fe4N core–shell structure at low-temperature gaseous nitriding of iron powder in a stream of ammonia”

2016 ◽  
Vol 7 (4) ◽  
pp. 641-641
Author(s):  
A. G. Gnedovets ◽  
A. B. Ankudinov ◽  
V. A. Zelenskii ◽  
E. P. Kovalev ◽  
H. Wisniewska-Weinert ◽  
...  
Keyword(s):  
Low Temperature ◽  
Iron Powder ◽  
Shell Structure ◽  
Core Shell ◽  
Gaseous Nitriding ◽  
Core Shell Structure

Synthesis and Antioxidant Behavior of Carbon-Coated Copper Nanoparticles

2012 ◽  
Vol 568 ◽  
pp. 299-302
Author(s):  
Jin Chen ◽  
Hai Yan Zhang ◽  
Xiao Ping Liu ◽  
Li Ping Li
Keyword(s):  
Copper Nanoparticles ◽  
Copper Content ◽  
Metal Content ◽  
Room Temperature ◽  
Carbon Layer ◽  
Core Shell ◽  
Good Oxidation Resistance ◽  
Carbon Coated ◽  
Core Shell Structure ◽  
Conductivity Jump

We use plasma method syntheisized Carbon coated copper nanoparticles The structure , size distribution and phase composition of the particles were analysised by TEM , XRD and DSC. Meanwhile, The conductivity of carbon-coated copper nanoparticles were measured. Results show that Carbon coated copper nanoparticles were core-shell structure for the copper core inside, the multi carbon layer outside, around the copper core is graphite-like carbon and far away from the copper core is amorphous carbon. While carbon-coated copper nanoparticles at room temperature and high temperatures have shown good oxidation resistance; The conductivity of carbon-coated copper nanoparticles with metal content increases and when the copper content is 80% the conductivity jump.

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