An experimental study of the relationship between oxygen partial pressure and friction for 52100 steel

Wear ◽  
1968 ◽  
Vol 11 (5) ◽  
pp. 386
Keyword(s):  
Experimental Study ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
The Relationship

Oxygen potentials of PuO2-x

2012 ◽  
Vol 1444 ◽  
Author(s):  
Akira Komeno ◽  
Masato Kato ◽  
Shun Hirooka ◽  
Takeo Sunaoshi
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Measurement Data ◽  
Approximate Equation ◽  
Defect Chemistry ◽  
Thermo Gravimetry ◽  
Metal Ratio ◽  
The Relationship

ABSTRACTOxygen potentials of PuO2-x were measured at temperatures of 1473 - 1873 K by thermo-gravimetry. The oxygen potentials were determined by in situ analysis as functions of oxygen-to-metal ratio and temperature. The measurement data were analyzed on the basis of defect chemistry and an approximate equation was derived to represent the relationship among temperature, oxygen partial pressure, and deviation x in PuO2-x.

scholarly journals A Thermodynamic Analysis on the Roasting of Pyrite

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 220 ◽  
Author(s):  
Yan Zhang ◽  
Qian Li ◽  
Xiaoliang Liu ◽  
Bin Xu ◽  
Yongbin Yang ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Iron Oxides ◽  
Thermodynamic Analysis ◽  
Inert Atmosphere ◽  
Thermodynamic Calculations ◽  
Oxidizing Atmosphere ◽  
Low Levels ◽  
Iron Sulphates ◽  
The Relationship

A series of thermodynamic calculations are performed for the roasting of pyrite in changing temperatures and atmospheres. The relationship between ΔrGθ and temperature in the range of T = 300–1200 K shows that, depending on the atmosphere it is in, reactions of pyrolysis, oxidation or reduction can occur. Both the pyrolysis of pyrite in an inert atmosphere and its oxidation by oxygen can form pyrrhotite (mainly Fe0.875S and FeS), but the temperature required for oxidation is much lower than that for pyrolysis. In an oxygen-containing atmosphere, the isothermal predominance areas for the Fe–S–O system indicate that a change in temperature and oxygen partial pressure can lead the pyrite to undergo desulphurization to pyrrhotite (FeS2 → Fe0.875S/FeS) or iron oxides (FeS2 → Fe3O4/Fe2O3), or sulphation to iron sulphates (FeS2 → FeSO4/Fe2(SO4)3). The presence of carbon is beneficial to the desulphurization of pyrite under an oxidizing atmosphere since iron sulphates can be converted to iron oxides at very low levels of PCO/PCO2. Results presented in this paper offer theoretical guidance for the optimization of roasting of pyrite for different purposes.

scholarly journals An experimental study of Ti-6Al-4V powder reactivity in gaseous environment: Application to additive manufacturing

2020 ◽  
Vol 321 ◽  
pp. 03035
Author(s):  
Mohamad Mahdi Siblani ◽  
Maelig Ollivier ◽  
Loïc Favergeon
Keyword(s):  
Carbon Dioxide ◽  
Experimental Study ◽  
Additive Manufacturing ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Manufacturing Processes ◽  
Nitrogen Partial Pressure ◽  
Gaseous Environment ◽  
Corrosion Kinetics ◽  
Effect Of Oxygen

Currently, one of the current issues related to the additive manufacturing is the change in the properties of Ti-6Al-4V powder during this process. This change has been attributed to the interaction of this powder with its gaseous environment that can contain a small quantity of oxygen, nitrogen, carbon dioxide and/or water vapour. Therefore, the aim of this work is to study the effect of oxygen and nitrogen partial pressure as well as the effect of the temperature on the corrosion of the Ti-6Al-4V powder. The results show that the temperature and the oxygen partial pressure have an effect on the corrosion kinetics, which is not the case of nitrogen partial pressure. This study is a first step towards a better understanding of the ageing of Ti-6Al-4V powder during additive manufacturing processes.

Undergraduate students' misconceptions about respiratory physiology.

1999 ◽  
Vol 277 (6) ◽  
pp. S127 ◽  
Author(s):  
J A Michael ◽  
D Richardson ◽  
A Rovick ◽  
H Modell ◽  
D Bruce ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Undergraduate Students ◽  
Liberal Arts ◽  
Minute Ventilation ◽  
Respiratory Physiology ◽  
Carbon Dioxide Partial Pressure ◽  
Arterial Oxygen ◽  
Physiological Variables ◽  
The Relationship

Approximately 700 undergraduates studying physiology at community colleges, a liberal arts college, and universities were surveyed to determine the prevalence of our misconceptions about respiratory phenomena. A misconception about the changes in breathing frequency and tidal volume (physiological variables whose changes can be directly sensed) that result in increased minute ventilation was found to be present in this population with comparable prevalence (approximately 60%) to that seen in a previous study. Three other misconceptions involving phenomena that cannot be experienced directly and therefore were most likely learned in some educational setting were found to be of varying prevalence. Nearly 90% of the students exhibited a misconception about the relationship between arterial oxygen partial pressure and hemoglobin saturation. Sixty-six percent of the students believed that increasing alveolar oxygen partial pressure leads to a decrease in alveolar carbon dioxide partial pressure. Nearly 33% of the population misunderstood the relationship between metabolism and ventilation. The possible origins of these respiratory misconceptions are discussed and suggestions for how to prevent and/or remediate them are proposed.

scholarly journals Transport Properties of Film and Bulk Sr0.98Zr0.95Y0.05O3−δ Membranes

2020 ◽  
Vol 10 (7) ◽  
pp. 2229 ◽  
Author(s):  
Adelya Khaliullina ◽  
Liliya Dunyushkina ◽  
Alexander Pankratov
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Transport Properties ◽  
Effective Conductivity ◽  
Ionic Transport ◽  
Transport Numbers ◽  
Pressure Gradients ◽  
Solution Deposition ◽  
Bulk Membrane ◽  
The Relationship

In electrode-supported solid oxide fuel cells (SOFCs) with a thin electrolyte, the electrolyte performance can be affected by its interaction with the electrode, therefore, it is particularly important to study the charge transport properties of thin electrode-supported electrolytes. The transport numbers of charged species in Ni-cermet supported Sr0.98Zr0.95Y0.05O3−δ (SZY) membranes were studied and compared to those of the bulk membrane. SZY films of 2.5 μm thickness were fabricated by the chemical solution deposition technique. It was shown that the surface layer of the films contained 1.5–2 at.% Ni due to Ni diffusion from the substrate. The Ni-cermet supported 2.5 μm-thick membrane operating in the fuel cell mode was found to possess the effective transport number of oxygen ions of 0.97 at 550 °C, close to that for the bulk SZY membrane (0.99). The high ionic transport numbers indicate that diffusional interaction between SZY films and Ni-cermet supporting electrodes does not entail electrolyte degradation. The relationship between SZY conductivity and oxygen partial pressure was derived from the data on effective conductivity and ionic transport numbers for the membrane operating under two different oxygen partial pressure gradients—in air/argon and air/hydrogen concentration cells.

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