scholarly journals Analysis of the CO2 Chemisorption in Li5FeO4, a New High Temperature CO2 Captor Material. Effect of the CO2 and O2 Partial Pressures

2017 ◽  
Vol 121 (6) ◽  
pp. 3455-3462 ◽  
Author(s):  
Hugo A. Lara-García ◽  
Pedro Sanchez-Camacho ◽  
Yuhua Duan ◽  
José Ortiz-Landeros ◽  
Heriberto Pfeiffer
Keyword(s):  
High Temperature ◽  
Partial Pressures ◽  
Co2 Chemisorption

Effect of CO2 on Anti-Corrosion Property of a Polyurea Coating Modified with Organosilicone

2014 ◽  
Vol 789 ◽  
pp. 466-470
Author(s):  
Qing Hao Shi ◽  
Bing Ying Wang ◽  
Bin Zhao
Keyword(s):  
High Temperature ◽  
Partial Pressure ◽  
Composite Coating ◽  
Corrosion Test ◽  
Electrochemical Impedance ◽  
Failure Process ◽  
Corrosion Property ◽  
Corrosion Mechanism ◽  
Partial Pressures ◽  
High Temperature High Pressure

The corrosion mechanism of organic silicon modified polyurea composite coating under different CO2 partial pressures was studied using high-temperature autoclave, combined with scanning electron microscopy (SEM), adhesion tests and electrochemical impedance spectroscopy (EIS) technology. The experimental results showed that: there was no corrosion product formed on the surface of coating sample after high-temperature high-pressure corrosion test, and with the increasing of CO2 partial pressure, the coating adhesion and impedance values decline increases. Moreover CO2 partial pressure increases accelerated the failure process of polyurea composite coating system.

High temperature XRD on silver sheathed Bi(Pb)-2223 tapes in different oxygen partial pressures

1998 ◽  
Vol 11 (8) ◽  
pp. 777-780 ◽  
Author(s):  
J Müller ◽  
J H Albering ◽  
B Fischer ◽  
S Kautz ◽  
P Herzog
Keyword(s):  
High Temperature ◽  
Partial Pressures ◽  
High Temperature Xrd

YBa2Cu3O7–x:Transport Properties and Defects at High Temperature

1989 ◽  
Vol 44 (12) ◽  
pp. 1167-1171 ◽  
Author(s):  
G. Chiodelli ◽  
G. Campari-Viganò ◽  
G. Flor
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
Tetragonal Phase ◽  
Orthorhombic Phase ◽  
Ion Migration ◽  
Resistivity Measurements ◽  
Oxygen Ion ◽  
Partial Pressures ◽  
Oxygen Ion Migration ◽  
The One

Abstract Electrical resistivity measurements were carried out on polycrystalline YBa2Cu3O7-x at temperatures 300 < T < 1023 K and oxygen partial pressures 5 ·10-7 ≤ po2 ≤ 1 atm. The samples, equilibrated in the range from 5 ·10-4 to 1 atm, show metallic behaviour, the one equilibrated at po2 = 2 ·10-5 shows a transition between metallic and semiconducting behaviour at 920 K, and that equilibrated at po2 = 5 ·10-7 shows semiconducting behaviour: for the latter the relevant resistivity is due to the oxygen-ion migration. The isotherms log σ vs. log po2 (in the temperature range from 723 to 1023 K) show slopes of about 1/6 at 723 K (orthorhombic phase) and about 1/2 at 1023 K (tetragonal phase). These results are discussed in terms of appropriate defect models.

Influence of the Processing Parameters on the Nature of Oxides Formed on Sintered Stainless Steels during High-Temperature Exposures

2009 ◽  
Vol 289-292 ◽  
pp. 485-492
Author(s):  
Asuncion Bautista ◽  
Cristina Moral ◽  
Francisco Velasco
Keyword(s):  
High Temperature ◽  
Stainless Steels ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Cross Sectional ◽  
Pressing Method ◽  
Sintering Atmosphere ◽  
Partial Pressures ◽  
Oxidation Mechanisms ◽  
Oxidative Attack

Powder metallurgical (PM) stainless steels can be used for high-temperature applications. However, their characteristic porosity dramatically affects the resistance of the stainless steels to the oxidative attack and modifies the oxidation mechanisms. In this work, it is discussed how the processing parameters of PM stainless steels can modify the diffusion process when the material is exposed at high-temperature in oxidative environments. Processing parameters affect not only the amount but also the nature of the formed oxides. For powders of a given composition, the pressing method, the sintering atmosphere (vacuum, 100% H2 or 75%H2/25%N2) and the sintering temperature can modify the amount of porosity and its shape, often promoting the formation of less-protective oxides, instead of chromia. The different oxygen partial pressures in the inner pores and on the outer surface of the material also tend to make oxides formed inside the stainless steel pores more protective than those formed on their surface. X-ray diffraction, SEM and EDS studies of surface and cross-sectional views of the oxidized materials are used to prove these differences.

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