scholarly journals Oxidation of MgF2 Particles in SF6/Air Atmosphere at High Temperatures

2018 ◽  
Author(s):  
H. K. Chen ◽  
L. Chang ◽  
Y. Y. Jie
Keyword(s):  
High Temperatures ◽  
Air Atmosphere

Kinetics of Corrosion Processes of Alloy on the Intermetallic Phase Matrix FeAl in High Temperature in Air Atmosphere

2013 ◽  
Vol 212 ◽  
pp. 137-140 ◽  
Author(s):  
Janusz Cebulski ◽  
Stanisław Lalik
Keyword(s):  
High Temperature ◽  
Heat Resistance ◽  
High Temperatures ◽  
Intermetallic Phase ◽  
High Temperature Corrosion ◽  
Corrosion Products ◽  
Corrosion Tests ◽  
Air Atmosphere ◽  
Passive Oxides ◽  
Kinetics Of

The aim of this paper was to determine the resistance to high-temperature corrosion in atmosphere of air for alloy Fe-40Al-5Cr-0.2Ti-0.2B. Corrosion tests were conducted in temperatures from 600 to 900°C in time from 2 to 64 hours. Conducted tests have shown a slight increase of weight of samples in periods of time which followed. Increase of weight is connected with corrosion products in the form of passive oxides which form on the surface of the alloy. Kinetics of corrosion processes has parabolic course in tested temperature range which proves the formation of passive layers of corrosion products on the surface of samples. Heat resistance of the alloy on intermetallic phase matrix FeAl brings about potential possibilities to apply this alloy as a material meant for work in elevated and high temperatures in the environment which includes oxygen.

Effects of Biomass and Crude Oil Co-Combustion on NO and SO2 Emissions

2014 ◽  
Vol 694 ◽  
pp. 489-493
Author(s):  
Guang Yang ◽  
Zi Fang Wang ◽  
Meng Si ◽  
Jing Hong Lian ◽  
Lian Sheng Liu ◽  
...  
Keyword(s):  
Crude Oil ◽  
High Temperatures ◽  
Electric Furnace ◽  
Low Temperatures ◽  
Mass Fraction ◽  
No Emission ◽  
Air Atmosphere

In this paper, a tube electric furnace is used to process the co-combustion of biomass and crude oil in air atmosphere, the influence of the biomass mass fraction and the temperature on NO and SO2 emissions are analysed. Research shows that with the increasing addition ratio of biomass to crude oil, the amount of NO in per unit heat reduces. This tendency is more apparent at high temperatures. Compared with crude oil, the NO emission of 20% biomass mass fraction at 1100°C is reduced by 25.8% while 19.02% at 700°C. SO2 emission in per unit heat decreases with the increasing biomass mass fraction. This tendency is more apparent at low temperatures. Compared with crude oil The generation of SO2 of 20% biomass mass fraction can reduce 91.5% at 700°C while 36.7% at 1100°C.

Deterioration mechanism of insulated circuit substrates in thermoelectric modules operating at medium–high temperatures in air atmosphere

2021 ◽  
Vol 120 ◽  
pp. 105088
Author(s):  
Koya Arai ◽  
Krunoslav Romanjek ◽  
Kimihito Nishikawa ◽  
Shuji Nishimoto ◽  
Masahito Komasaki ◽  
...  
Keyword(s):  
High Temperatures ◽  
Thermoelectric Modules ◽  
Air Atmosphere ◽  
Deterioration Mechanism

scholarly journals The oxidation properties of MgF2 particles in hydrofluorocarbon/air atmosphere at high temperatures

2019 ◽  
Vol 688 ◽  
pp. 033086
Author(s):  
Jie Huang ◽  
Hukui Chen ◽  
Hongli Jiang ◽  
Xiaxia Mu ◽  
Jiang Yu
Keyword(s):  
High Temperatures ◽  
Air Atmosphere ◽  
Oxidation Properties

Studies of the Influence of High Temperatures and Aggressive Media on the Performance Properties of O-Rings Used in the Automotive Industry

2021 ◽  
Vol 410 ◽  
pp. 587-592
Author(s):  
Gulgena D. Shakirova ◽  
Natalya V. Romanova ◽  
Lenar N. Shafigullin
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
High Temperatures ◽  
Automotive Industry ◽  
High Heat ◽  
High Heat Resistance ◽  
Performance Properties ◽  
Air Atmosphere ◽  
Heat Stable ◽  
Fluorosilicone Rubber

The paper provides the results of the studies on the influence of high temperatures and aggressive media on the performance properties of O-rings having one name but made by different manufacturers. O-rings by supplier No. 1 are made from fluorosilicone rubber, and O-rings by supplier No. 2 are made from fluororubber. The analysis of O-rings showed that the color of O-rings made from fluorosilicone rubber changed and their physical mechanical properties decreased after operation when subjected to G-energy Si-OAT and G-energy SNF coolants. The comparative analysis of TGA curves of O-rings showed that O-rings made from fluororubber were more heat stable than O-rings made from fluorosilicone rubber, i.e. they can withstand higher operating temperatures in an air atmosphere. Fluoroelastomers can recover quickly and are used to manufacture products which should have a high heat resistance during operation and high resistance to aggressive coolants.

Degradation of Mechanical and Structural Properties of Steel T23

2007 ◽  
Vol 567-568 ◽  
pp. 389-392 ◽  
Author(s):  
Marie Svobodová ◽  
Jindřich Douda ◽  
Jiří Kudrman
Keyword(s):  
Heat Treatment ◽  
Structural Properties ◽  
High Temperatures ◽  
Base Material ◽  
Experimental Results ◽  
Air Atmosphere ◽  
Mechanical And Structural Properties ◽  
Long Time ◽  
Initial Heat ◽  
Initial Heat Treatment

This paper deals with changes in mechanical and structural properties of Steel T23 during long-time annealing at high temperatures. The research is focused on the degradation of the base material (steel T23), where the samples of steel, after the initial heat treatment, were annealed at temperatures of 600, 650 and 700 °C for 10 to 10 000 hours in a furnace with air atmosphere. This contribution summarizes the experimental results of mechanical and structural measurements and gives the relations between them.

scholarly journals Synthesis and Thermal Degradation Study of Polyhedral Oligomeric Silsesquioxane (POSS) Modified Phenolic Resin

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1182
Author(s):  
Degang Wang ◽  
Jie Ding ◽  
Bing Wang ◽  
Yingluo Zhuang ◽  
Zhixiong Huang
Keyword(s):  
Thermal Degradation ◽  
High Temperatures ◽  
Phenolic Resin ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
X Ray Diffraction ◽  
Temperature Oxidation ◽  
Air Atmosphere ◽  
Degradation Behaviors ◽  
The One ◽  
Oligomeric Silsesquioxane

In this paper, a new polyhedral oligomeric silsesquioxane containing a phenol group (POSS-Phenol) is prepared through the Michael addition reaction, which is added to the synthesis of phenolic resin as a functional monomer. Infrared spectroscopy (IR) is used to demonstrate the chemistry structure of the synthesized POSS modified phenolic resin. After introducing POSS into the resole, a comprehensive study is conducted to reveal the effects of POSS on the thermal degradation of phenolic resin. First, thermal degradation behaviors of neat phenolic resin and modified phenolic resin are carried out by thermogravimetric analysis (TGA). Then, the gas volatiles from thermal degradation are investigated by thermogravimetric mass spectrometry (TG-MS). Finally, the residues after thermal degradation are characterized by X-ray diffraction (XRD). The research indicates that POSS modified phenolic resin shows a better thermal stability than neat phenolic resin, especially at high temperatures under air atmosphere. On the one hand, the introduction of the POSS group can effectively improve the release temperature of oxygen containing volatiles. On the other hand, the POSS group forms silica at high temperatures under air, which can effectively inhibit the thermal oxidation of phenolic resin and make phenolic resin show a better high-temperature oxidation resistance.

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

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