Effect of Processing Technique on Microstructure and Oxidation Behavior of Rare Earth Oxide Dispersion Containing Steels

2001 ◽  
Vol 189-191 ◽  
pp. 322-327 ◽  
Author(s):  
M.F. Pillis ◽  
Lalgudi Venkataraman Ramanathan
Keyword(s):  
Rare Earth ◽  
Oxidation Behavior ◽  
Rare Earth Oxide ◽  
Processing Technique ◽  
Oxide Dispersion

scholarly journals Effect of Rare Earth Oxide Dispersion on the Oxidation of Ni–15Cr Sintered Alloy

1983 ◽  
Vol 24 (12) ◽  
pp. 839-848 ◽  
Author(s):  
Hiroshi Nagai ◽  
Fusaki Koshi-ishi ◽  
Shinji Ishikawa ◽  
Kei-ichiro Shoji
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxide ◽  
Sintered Alloy ◽  
Oxide Dispersion

Oxidation Behavior Research of the SiC/B4C Multiphase Ceramics

2015 ◽  
Vol 727-728 ◽  
pp. 288-291 ◽  
Author(s):  
Yun Long Zhang ◽  
Xiao Gang Song ◽  
Guo Jing Li ◽  
Yu Min Zhang
Keyword(s):  
Rare Earth ◽  
Oxidation Behavior ◽  
Rare Earth Oxide ◽  
Eutectic Phase ◽  
Oxidation Time ◽  
Pressureless Sintering ◽  
Micro Structure ◽  
Phase Constitution ◽  
Sintering Additives ◽  
Multiphase Ceramics

Inthis investigation, the rare-earth oxide Yb2O3 combined with Al2O3served as sintering additives and SiC and B4C powder were applied to fabricate SiC/B4C multiphase ceramics composites by pressureless sintering. The results proved thatcombination of Al2O3 and Yb2O3 sinter additives were effective fordensification of SiC/B4C composites. The influence of oxidation time onthe phase constitution, micro-structure and oxidation behavior of SiC/B4C composites was investigated.Theformation of eutectic phase Yb2Si2O7 phase waswrapped on the SiC surface and it reduced further oxidation of SiC particles.The oxidation kineticcurves followed a parabolic rule.

Oxidation behavior of rare earth oxide-coated Fe20Cr and Fe20Cr5Al alloys

2011 ◽  
Vol 106 (2) ◽  
pp. 541-543 ◽  
Author(s):  
Stela M. C. Fernandes ◽  
Olandir V. Correa ◽  
Lalgudi V. Ramanathan
Keyword(s):  
Rare Earth ◽  
Oxidation Behavior ◽  
Rare Earth Oxide

Oxidation Behavior and Mechanical Property of Si3N4 Ceramics with Rare Earth Oxide Addition

2007 ◽  
Vol 336-338 ◽  
pp. 2478-2480
Author(s):  
Xu Guang Tong ◽  
Jian Bao Li ◽  
Hong Lin ◽  
Xiao Zhan Yang ◽  
Jun Yang
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Oxidation Behavior ◽  
Rare Earth Oxide ◽  
Oxidation Products ◽  
Oxidation Test ◽  
Oxide Addition ◽  
Nitride Ceramics ◽  
Before And After ◽  
Si3n4 Ceramics

The effects of rare earth oxides (Lu2O3 and La2O3) on the property, microstructure and oxidation behavior of hot-pressing sintered Si3N4 ceramics were investigated. The silicon nitride ceramics with Lu2O3 and La2O3 as addition have been fabricated by hot-pressed at 1800°C for 1h under a pressure of 25MPa. Oxidation test was carried out at 1400°C in air for 100 hours. Mechanical properties, SEM and XRD were measured before and after oxidation. The results showed that Si3N4 ceramics doped Lu2O3 had good microstructure and mechanical properties than those doped La2O3. Oxidation test showed a parabolic weight gain with oxidation time at 1400°C in air and the oxidation products of the ceramics were SiO2, Re2Si2O7 and Re2SiO5 confirmed by XRD and EDS. The rate-controlling step was the diffusion of ion. The samples doped Lu2O3 showed superior oxidation resistance to those doped La2O3.

scholarly journals Effect of rare earth oxide additions on oxidation behavior of AISI 304L stainless steel

2006 ◽  
Vol 9 (4) ◽  
pp. 375-379 ◽  
Author(s):  
Marina Fuser Pillis ◽  
Edval Gonçalves de Araújo ◽  
Lalgudi Venkataraman Ramanathan
Keyword(s):  
Stainless Steel ◽  
Rare Earth ◽  
Oxidation Behavior ◽  
Rare Earth Oxide ◽  
304L Stainless Steel ◽  
Aisi 304L ◽  
Aisi 304L Stainless Steel

Effect of Addition of Rare Earth Oxide Concentrates on Oxidation Resistance of AISI 304L

2006 ◽  
Vol 530-531 ◽  
pp. 99-104 ◽  
Author(s):  
M.F. Pillis ◽  
Edval G. de Araújo ◽  
Lalgudi Venkataraman Ramanathan
Keyword(s):  
Rare Earth ◽  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Steel Powder ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides ◽  
304L Stainless Steel ◽  
Reaction Products ◽  
Temperature Oxidation ◽  
Aisi 304L

Rare earth elements are often added to chromium dioxide forming alloys to improve its high temperature oxidation resistance. The rare earths can be also added as oxide dispersions. Significant cost reductions are possible if rare earth oxide concentrates can be used instead of pure rare earth oxides, the former being the precursor to obtaining pure rare earth oxide. In this study the effect of adding pure and concentrates of rare earth oxides to AISI 304L on its oxidation behavior has been evaluated. AISI 304L stainless steel powder compacts containing 2 vol% of pure lanthanum and yttrium oxides or their concentrate were prepared by milling followed by pressing. The compacts were vacuum sintered and isothermally oxidized in air for up to 200h at 900°C. The parabolic rate constants were determined and the reaction products examined using a scanning electron microscope. X-ray diffraction analysis of the reaction products was also carried out. The compacts with pure rare earth oxides and the concentrates exhibited similar oxidation behavior.

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