Low pressure oxygen direct current discharges with ion conducting yttria stabilized zirconia electrodes

2013 ◽  
Vol 245-246 ◽  
pp. 24-32 ◽  
Author(s):  
S.O. Steinmüller ◽  
M. Rohnke ◽  
J. Janek
Keyword(s):  
Direct Current ◽  
Low Pressure ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Pressure Oxygen ◽  
Ion Conducting

scholarly journals Yttria stabilized zirconia membrane stability in molten fluoride fluxes for low-carbon magnesium production by the SOM process

2013 ◽  
Vol 49 (2) ◽  
pp. 183-190 ◽  
Author(s):  
J. Milshtein ◽  
E. Gratz ◽  
S. Pati ◽  
A.C. Powell ◽  
U. Pal
Keyword(s):  
Magnesium Oxide ◽  
Numerical Approach ◽  
Electrolytic Cell ◽  
Membrane Stability ◽  
Yttria Stabilized Zirconia ◽  
Low Carbon ◽  
Stabilized Zirconia ◽  
Operating Life ◽  
Magnesium Production ◽  
Ion Conducting

The Solid Oxide Membrane (SOM) process for magnesium production involves the direct electrolysis of magnesium oxide for energy efficient and low-carbon magnesium production. In the SOM process, magnesium oxide is dissolved in a molten oxy-fluoride flux. An oxygen-ion-conducting SOM tube, made from yttria stabilized zirconia (YSZ), is submerged in the flux. The operating life of the electrolytic cell can be improved by understanding degradation processes in the YSZ, and one way the YSZ degrades is by yttria diffusion out of the YSZ. By adding small amounts of YF3 to the flux, yttria diffusion can be controlled. The diffusion of yttria into the flux was quantified by determining the yttria concentration profile as a function of immersion time in the flux and distance from the flux-YSZ interface. Yttria concentrations were determined using x-ray spectroscopy. The diffusion process was modeled using a numerical approach with an analytic solution to Fick?s second law. These modeling and experimental methods allowed for the determination of the optimum YF3 concentration in the flux to minimize yttria diffusion and improve membrane stability. Furthermore, the effects of common impurities in magnesium ores, such as calcium oxide, silica, and sodium oxide/sodium peroxide, on YSZ stability are being investigated.

Very low pressure plasma sprayed yttria-stabilized zirconia coating using a low-energy plasma gun

2011 ◽  
Vol 105 (4) ◽  
pp. 991-996 ◽  
Author(s):  
Lin Zhu ◽  
Nannan Zhang ◽  
Rodolphe Bolot ◽  
Marie-Pierre Planche ◽  
Hanlin Liao ◽  
...  
Keyword(s):  
Low Pressure ◽  
Low Energy ◽  
Yttria Stabilized Zirconia ◽  
Zirconia Coating ◽  
Stabilized Zirconia ◽  
Plasma Gun ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed

Direct Electrolytic Reduction of Solid Cr2O3 to Cr Using SOM Process

2013 ◽  
Vol 690-693 ◽  
pp. 78-81
Author(s):  
Chao Yi Chen ◽  
Zhi Hui Mao ◽  
Jun Qi Li
Keyword(s):  
Liquid Copper ◽  
Cell Voltage ◽  
Graphite Powder ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Particle Sizes ◽  
Electrolysis Time ◽  
Stabilized Zirconia ◽  
Oxygen Ion ◽  
Ion Conducting

A novel process of solid-oxide-oxygen-ion conducting membrane (SOM) technique has been investigated to produce Cr metal directly from Cr2O3 in molten CaCl2. The sintered porous Cr2O3 pellet was employed as the cathode while liquid copper, saturated with graphite powder and encased in a one-end-closed yttria-stabilized-zirconia (YSZ) tube, acted as the anode. The particle sizes and porosity of the cathode pellets are important factors that have significant impact on the electrolysis process. The optimal experimental condition is pellet forming pressure 4MPa, sintering and electrolytic temperature 1150°C, cell voltage 3.5V, electrolysis time 2h.

THERMAL SHOCK PROPERTIES OF YTTRIA-STABILIZED ZIRCONIA COATINGS DEPOSITED USING LOW-ENERGY VERY LOW PRESSURE PLASMA SPRAYING

2015 ◽  
Vol 22 (05) ◽  
pp. 1550061 ◽  
Author(s):  
LIN ZHU ◽  
NANNAN ZHANG ◽  
RODOLPHE BOLOT ◽  
HANLIN LIAO ◽  
CHRISTIAN CODDET
Keyword(s):  
Thermal Shock ◽  
Plasma Spray ◽  
Thermal Shock Resistance ◽  
Low Pressure ◽  
Low Energy ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Shock Resistance

Yttria-stabilized zirconia (YSZ) coatings have been frequently used as a thermal protective layer on the metal or alloy component surfaces. In the present study, ZrO 2-7% Y 2 O 3 thermal barrier coatings (TBCs) were successfully deposited by DC (direct current) plasma spray process under very low pressure conditions (less than 1 mbar) using low-energy plasma guns F4-VB and F100. The experiments were performed to evaluate the thermal shock resistance of different TBC specimens which were heated to 1373 K at a high-temperature cycling furnace and held for 0.5 h, followed by air cooling at room temperature for 0.2 h. For comparison, a corresponding atmospheric plasma spray (APS) counterpart was also elaborated to carry out the similar experiments. The results indicated that the very low pressure plasma spray (VLPPS) coatings displayed better thermal shock resistance. Moreover, the failure mechanism of the coatings was elucidated.

Yttria-stabilized zirconia thin films with restrained columnar grains for oxygen ion conducting electrolytes

2016 ◽  
Vol 42 (15) ◽  
pp. 16703-16709 ◽  
Author(s):  
Soonwook Hong ◽  
Dohaeng Lee ◽  
Yonghyun Lim ◽  
Jiwoong Bae ◽  
Young-Beom Kim
Keyword(s):  
Thin Films ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Oxygen Ion ◽  
Columnar Grains ◽  
Ion Conducting
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