Organometallacycles as Intermediates in Oxygen-Transfer Reactions. Reality or Fiction?

2005 ◽  
pp. 109-144 ◽  
Author(s):  
Dirk V. Deubel ◽  
Christoph Loschen ◽  
Gernot Frenking
Keyword(s):  
Oxygen Transfer ◽  
Transfer Reactions

ChemInform Abstract: Oxygen-Transfer Reactions of Oxaziridines

ChemInform ◽  
2010 ◽  
Vol 22 (6) ◽  
pp. no-no
Author(s):  
F. A. DAVIS ◽  
M. S. HAQUE
Keyword(s):  
Oxygen Transfer ◽  
Transfer Reactions

Oxygen Transfer Reactions during Sintering of Ferrous Powder Compacts

2018 ◽  
Vol 27 ◽  
pp. 3-13 ◽  
Author(s):  
Herbert Danninger ◽  
Raquel de Oro Calderon ◽  
Christian Gierl-Mayer
Keyword(s):  
Oxygen Transfer ◽  
Sintering Temperature ◽  
Early Stage ◽  
Oxygen Affinity ◽  
Oxygen Removal ◽  
Transfer Reactions ◽  
Getter Effect ◽  
Alloy Steels ◽  
Powder Compacts ◽  
Heating Up

Powder metallurgy products may be started from powders with widely varying oxygen affinity. Thus the natural oxygen content of the powder compacts also varies in reducibility in the early stages of sintering. Here it is shown that prealloyed powders containing Cr require higher temperatures for oxygen removal than e.g. unalloyed or Ni-Cu alloyed grades. In case of powder mixes of base iron powder with Cr, Mn or Si, oxygen transfer from Fe to the additive powders may occur during heating up to sintering temperature, the “internal getter effect”. A similar effect can be observed in Cr prealloyed powders in which iron oxides initially present on the powder surfaces are transformed to more stable oxides in a fairly early stage of heating. Finally, also the formation of CH4observed when sintering alloy steels containing Si, Mn or Cr in H2can be attributed to an oxygen transfer effect.

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