Kinetics of phase changes during the heating of specimens of zirconia and copper oxides

Refractories ◽  
1968 ◽  
Vol 9 (5-6) ◽  
pp. 317-319 ◽  
Author(s):  
A. F. Bessonov ◽  
G. A. Taksis
Keyword(s):  
Phase Changes ◽  
Copper Oxides ◽  
Kinetics Of

scholarly journals Carbonatation and Decarbonatation Kinetics in the La2O3-La2O2CO3System under CO2Gas Flows

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Bahcine Bakiz ◽  
Frédéric Guinneton ◽  
Madjid Arab ◽  
Abdeljalil Benlhachemi ◽  
Sylvie Villain ◽  
...  
Keyword(s):  
Gas Flow ◽  
Electrical Impedance ◽  
Ionic Conduction ◽  
Ionic Mobility ◽  
Phase Changes ◽  
Electrical Impedance Spectroscopy ◽  
Electrical Measurements ◽  
Carbonate Ions ◽  
Ionic Mobilities ◽  
Kinetics Of

The carbonatation of La2O3oxide and the decarbonatation of lanthanum carbonate phase La2O2CO3are investigated using thermal and thermogravimetry analyses under CO2gas flow. The initial phase La2O3is first elaborated from pyrolysis of a LaOHCO3precursor. Then, thermal and thermogravimetry analyses are carried out under CO2flow, as temperature increases then decreases. The carbonatation kinetics of La2O3is determined at three fixed temperatures. Electrical impedance spectroscopy is performed to determine the electrical responses associated with ionic mobilities and phase changes, in the temperature range 25 to900∘C. The electrical conduction during heating underCO2gas flow should be linked to two regimes of ionic conduction of the carbonate ions. From these electrical measurements, the ionic mobility of carbonate ionsCO3  2−is found to be close to 0.003 ⋅10−4 cm2 s−1 V−1at750∘C for the monoclinic La2O2CO3phase.

The kinetics of phase changes taking place during welding heating cycles in 08Kh18G8N2T steel

1987 ◽  
Vol 1 (2) ◽  
pp. 110-112
Author(s):  
M A Khubrikh ◽  
G A Sal'nikov ◽  
Zh A Lepilina ◽  
A S Zubchenko ◽  
I I Zhukova
Keyword(s):  
Phase Changes ◽  
Kinetics Of

Analysis of Morphology and Growth Kinetics of Zn-Mn and Zn-0.2wt.%Al-Mn Hot-Dip Galvanizing Coatings

2011 ◽  
Vol 291-294 ◽  
pp. 233-236
Author(s):  
Jian Hua Wang ◽  
Zi Shi Wu ◽  
Xu Ping Su ◽  
Chang Jun Wu ◽  
Ya Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Growth Kinetics ◽  
Immersion Time ◽  
Intermetallic Phase ◽  
Phase Changes ◽  
Zinc Bath ◽  
Phase Layer ◽  
Δ Phase ◽  
Kinetics Of ◽  
Scanning Electron

The influence of manganese in Zn-Mn and Zn-0.2wt.%Al-Mn bath on the morphology and growth kinetics of the galvanizing coatings has been studied using scanning electron microscopy equipped with energy dispersive spectroscopy. When galvanized in zinc bath, the coating consists mainly h and ζphase. When manganese is added in zinc bath, the morphology of ζ phase changes from fragmental to compact. Manganese favors the formation of the δ phase and inhibits the growth of the ζ phase.When galvanized in Zn-0.2wt.%Al bath, the coating consists only δ and h phase. With the addition of manganese in Zn-0.2wt.%Al bath, the morphology of δ phase changes from fragmental to compact The thickness of the Fe-Zn intermetallic phase layer in coatings decreases obviously when manganese is added into zinc and Zn-0.2wt.%Al bath, and the thickness increases slowly with the increase of immersion time.

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