scholarly journals Manufacturing And High Temperature Oxidation Properties Of Electro-Sprayed Fe-24.5% Cr-5%Al Powder Porous Metal

2015 ◽  
Vol 60 (2) ◽  
pp. 1169-1173
Author(s):  
Kee-Ahn Lee ◽  
Jae-Sung Oh ◽  
Young-Min Kong ◽  
Byoung-Kee Kim
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Porous Metal ◽  
Porous Metals ◽  
Temperature Oxidation ◽  
Spray Process ◽  
Surface Areas ◽  
Thermal Gravimetry ◽  
Oxidation Properties ◽  
Al Powder

Abstract Fe-Cr-Al based Powder porous metals were manufactured using a new electro-spray process, and the microstructures and high-temperature oxidation properties were examined. The porous materials were obtained at different sintering temperatures (1350°C, 1400°C, 1450°C, and 1500°)C and with different pore sizes (500 μm, 450 μm, and 200 μm). High-temperature oxidation experiments (TGA, Thermal Gravimetry Analysis) were conducted for 24 hours at 1000°C in a 79% N2+ 21% O2, 100 mL/min. atmosphere. The Fe-Cr-Al powder porous metals manufactured through the electro-spray process showed more-excellent oxidation resistance as sintering temperature and pore size increased. In addition, the fact that the densities and surface areas of the abovementioned powder porous metals had the largest effects on the metal’s oxidation properties could be identified.

Effect of Pre-Oxidation on the High Temperature Oxidation Behavior of Fe-Cr-Al Powder Porous Metal

2013 ◽  
Vol 690-693 ◽  
pp. 294-297
Author(s):  
Jae Sung Oh ◽  
Seon Hui Lim ◽  
Sung Hwan Choi ◽  
Man Ho Park ◽  
Kee Ahn Lee
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Oxidation Behavior ◽  
Porous Metal ◽  
Oxidation Temperature ◽  
Porous Metals ◽  
Temperature Oxidation ◽  
Al Powder ◽  
High Temperature Oxidation Behavior

This study investigated the effect of pre-oxidation on the high-temperature oxidation behavior of Fe-Cr-Al powder porous metal. Using the powder metallurgy process, Fe-Cr-Al powder porous metals with and without pre-oxidation were manufactured. 24-hour TGA tests were conducted at three different temperatures: 900°C, 1000°C, and 1100°C. The high temperature oxidation results showed that pre-oxidized powder porous metal had even higher levels of oxidation resistance compared to that of porous metal without pre-oxidation regardless of the oxidation temperature. The weight gain of pre-oxidized porous metal (0.123%) was lowest at oxidation temperature of 900°C. In contrast, the weight gain of porous metals significantly increased at 1100°C. In the porous metals 900°C and 1000°C oxidized specimen, oxides such as Al2O3and Cr2O3were mainly observed. Porous metals oxidation specimen at 1100°C also revealed the presence of Fe-based oxides in large quantities in addition to the oxides formed at lower temperature.

High Temperature Oxidation Behaviors of Fe-Cr-Al Based Powder Porous Metal and a Strip

2013 ◽  
Vol 51 (10) ◽  
pp. 743-751 ◽  
Author(s):  
Seon-Hui Lim ◽  
Jae-Sung Oh ◽  
Young-Min Kong ◽  
Byung-Kee Kim ◽  
Man-Ho Park ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Porous Metal ◽  
Temperature Oxidation ◽  
Oxidation Behaviors

scholarly journals High Temperature Oxidation Behavior of Ni based Porous Metal

2011 ◽  
Vol 18 (2) ◽  
pp. 122-128 ◽  
Author(s):  
Sung-Hwan Choi ◽  
Jung-Yeul Yun ◽  
Hye-Mun Lee ◽  
Young-Min Kong ◽  
Byoung-Kee Kim ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Oxidation Behavior ◽  
Porous Metal ◽  
Temperature Oxidation ◽  
High Temperature Oxidation Behavior

In situ Raman spectroscopy study on the effect of antioxidants on high temperature oxidation properties of TMPTO

2019 ◽  
Vol 71 (5) ◽  
pp. 706-711 ◽  
Author(s):  
Bingxue Cheng ◽  
Haitao Duan ◽  
Yongliang Jin ◽  
Lei Wei ◽  
Jia Dan ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Temperature ◽  
Thermal Oxidation ◽  
High Temperature Oxidation ◽  
Isothermal Oxidation ◽  
In Situ Raman Spectroscopy ◽  
Temperature Oxidation ◽  
Content Type ◽  
Structure Changes ◽  
Oxidation Properties

Purpose This paper aims to investigate the thermal oxidation characteristics of the unsaturated bonds (C=C) of trimethylolpropane trioleate (TMPTO) and to reveal the high temperature oxidation decay mechanism of unsaturated esters and the nature of the anti-oxidation properties of the additives. Design/methodology/approach Using a DXR laser microscopic Raman spectrometer and Linkam FTIR600 temperature control platform, the isothermal oxidation experiments of TMPTO with or without 1.0 wt. % of different antioxidants were performed. Findings The results indicated that the Raman peaks of =C-H, C=C and -CH2- weaken gradually with prolonged oxidation time, and the corresponding Raman intensities drop rapidly at higher temperatures. The aromatic amine antioxidant can decrease the attenuation of peak intensity, as it significantly reduces the rate constant of C=C thermal oxidation. The hindered phenolic antioxidant has a protective effect during the early stages of oxidation (induction period), but it may accelerate the oxidation of C=C afterwards. Originality/value Research on the structure changes of synthetic esters during oxidation by Raman spectroscopy will be of great importance in promoting the use of Raman spectroscopy to analyze the oxidation of lubricants.

High Temperature Oxidation Behavior of NiAl and Ni3Al Argon Arc Claddings

2011 ◽  
Vol 189-193 ◽  
pp. 441-446
Author(s):  
Xiao Xia Tan ◽  
Zong De Liu
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Steel Substrate ◽  
Temperature Oxidation ◽  
Metallurgical Bonding ◽  
The Matrix ◽  
Oxidation Properties ◽  
High Temperature Oxidation Behavior ◽  
16Mn Steel

NiAl and Ni3Al intermetallic compound claddings are prepared by argon arc cladding technology on the 16Mn steel substrate. These claddings were oxidized for 100 hours at 850 and the oxide quality of each sample was recorded every 10 hours. The results show that the NiAl and Ni3Al claddings have homogeneous structure and few defects, and form excellent metallurgical bonding with the matrix. The oxidation kinetics results show that, the oxidation weight gain rate of NiAl was more stable than Ni3Al and tended to zero earlier. Oxide layer spallation of Ni3Al cladding was more serious than that of NiAl cladding. Thus, NiAl argon arc cladding has the more excellent high temperature oxidation properties than Ni3Al argon arc cladding.

Sign in / Sign up

Export Citation Format

Share Document