Oxidation Behavior of Advanced Intermetallic Compounds

1990 ◽  
Vol 213 ◽  
Author(s):  
Douglas W. Mckee ◽  
Robert L. Fleischer
Keyword(s):  
Intermetallic Compounds ◽  
Oxidation Behavior ◽  
High Melting Point ◽  
Iron Cobalt ◽  
Nickel Iron ◽  
Intermetallic Materials ◽  
Chromium Silicide ◽  
Oxidation Resistant ◽  
Binary Compounds ◽  
Cobalt And Nickel

ABSTRACTThe oxidation behavior of a number of ordered high melting point intermetallic materials has been studied in flowing air in the temperature range 1000 to 1500°C. The alloys were selected for acceptable toughness and ductility at temperatures above 1000°C. Included were ruthenium aluminides, chromium silicide and compounds of iridium and ruthenium with elements such as titanium, tantalum, nickel, iron, cobalt, silicon, vanadium and rhenium. In general, alloys containing the metals iron, cobalt and nickel, and also titanium and tantalum, oxidized rapidly at 1000°C and above. Oxidation-resistant materials were those capable of forming scales of chromia/silica or alumina. Intermetallic compounds of chromium and ruthenium formed volatile oxides above 1200°C, but binary compounds of these elements with silicon and aluminum were highly oxidation resistant at lower temperatures.

Composition and Oxidation State of Cobalt and Nickel-Iron Oxide Colloidal Nanoparticles in Liquid Phase

2015 ◽  
Vol 1103 ◽  
pp. 21-27 ◽  
Author(s):  
Teerapat Rutirawut ◽  
Wanwisa Limphirat ◽  
Asawin Sinsarp ◽  
Kritsanu Tivakornsasithorn ◽  
Toemsak Srikhirin ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Liquid Phase ◽  
Oxidation State ◽  
Ambient Air ◽  
Oxidation States ◽  
Edge Structure ◽  
Iron Cobalt ◽  
Nickel Iron ◽  
Cobalt And Nickel

The magnetic nanoparticles of cobalt-and nickel-iron oxide have been extensive interest due to their superparamagnetic properties and their potential applications in many fields. The iron, cobalt and nickel can stay in many oxidation states and are easily oxidized especially in ambient air therefore the composition and oxidation states of these oxides can be unintentionally modified. Usually, the composition and oxidation states in these magnetic nanoparticles are determined by various experimental techniques required a sample in solid phase. This may lead the nanoparticles to directly contact with air and change the state. In this study, the magnetic nanoparticles in colloidal phase with concentration of 24mg/ml, derived from co-precipitation process, were directly injected to liquid cell for X-ray absorption near-edge structure (XANES) measurement. The iron-, cobalt-or nickel-iron oxide nanoparticles were prepared by dissolving CoCl2/FeCl3 or NiCl2/FeCl3, respectively, in deionized water with various atomic ratios. The average iron oxide nanoparticle size obtained by dynamic light scattering is about 4.2 nm with polydispersity of 0.987. Spherical shape with some stabilizer layer was observed by transmission electron microscope. The iron content in various composition nanoparticles was estimated in liquid phase by the ratio between the Fe edge peak and Co or Ni edge peak. The oxidation states of metal ions were also derived from the linear fitting of standard compounds at particular oxidation states. The shifts of peak positions were examined to indicate the variation of oxidation state as well.

Progress in preparation and characterization of silylene iron, cobalt and nickel complexes

2021 ◽  
Author(s):  
Wenjing Yang ◽  
Yanhong Dong ◽  
Hongjian Sun ◽  
Xiaoyan Li
Keyword(s):  
Nickel Complexes ◽  
Electron Cloud ◽  
Synthesis And Characterization ◽  
Iron Cobalt ◽  
Cloud Density ◽  
Cobalt And Nickel

The synthesis and characterization of Fe, Co and Ni complexes supported by silylene ligands in recent ten years are summarized. Due to the decrease of electron cloud density on Si...

Atomic fluorescence study on iron, cobalt, and nickel

1969 ◽  
Vol 41 (3) ◽  
pp. 518-522 ◽  
Author(s):  
Jaroslav. Matousek ◽  
Vaclav. Sychra
Keyword(s):  
Fluorescence Study ◽  
Atomic Fluorescence ◽  
Iron Cobalt ◽  
Cobalt And Nickel

DIFFUSION OF Ni63 IN IRON, COBALT, NICKEL, AND TWO IRON–NICKEL ALLOYS

1959 ◽  
Vol 37 (10) ◽  
pp. 1629-1636 ◽  
Author(s):  
J. R. MacEwan ◽  
J. U. MacEwan ◽  
L. Yaffe
Keyword(s):  
Surface Activity ◽  
Nickel Alloys ◽  
Nickel Content ◽  
The Self ◽  
Iron Cobalt ◽  
Self Diffusion ◽  
Cobalt Nickel ◽  
Iron Nickel ◽  
Iron Nickel Alloys ◽  
Cobalt And Nickel

The self-diffusion of nickel and the diffusion of Ni63 into iron, cobalt, and two iron–nickel alloys was studied using the technique of decrease in surface activity, The nickel self-diffusion results are compared to previously reported values. Nickel is found to diffuse more slowly than iron in the iron-rich portion of the iron–nickel system. The rate of nickel diffusion increases with increasing nickel content. A comparison is made between the present results for diffusion of Ni63 into iron, cobalt, and nickel with reported values for diffusion of Co60 and Fe59 in the same metals. In each solvent, the magnitudes of the activation energies, Q, are such that QNi > QCo > QFe.

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