Properties of Porous FeAl Manufactured from Ball Milled Fe/Al Elemental Powders by Two-Step Sintering

2013 ◽  
Vol 364 ◽  
pp. 553-557
Author(s):  
Jing Lei Liu ◽  
Yuan Zhang He ◽  
Hong Xu ◽  
Xian Yong Ye
Keyword(s):  
High Temperature ◽  
316L Stainless Steel ◽  
Sintering Temperature ◽  
Test System ◽  
Air Oxidation ◽  
Medium Temperature ◽  
Temperature Oxidation ◽  
Solid Diffusion ◽  
Mercury Porosimeter ◽  
Oxidation In Air

Porous FeAl was manufactured from ball milled Fe/Al elemental powders followed by medium temperature solid diffusion and high temperature sintering. Phase composition and porous structure were analyzed by XRD, SEM, Mercury Porosimeter and permeability test system. High temperature oxidation in air and high temperature sulfidation in SO2(3v%)+N2 at 600°C were carried out to investigate the behaviors of the porous FeAl, and the results were compared to 316L porous materials. The result showed that high sintering temperature hastened the transform of Fe2Al5 to FeAl intermatellic. The permeability of the porous FeAl increased and the most probable size decreased with sintering temperature. The porous FeAl had mass gains of 0.06% for air oxidation and 0.13% for sulphidation after 50 h at 600°C, compared with mass gains of 0.15% and 5.3% respectively of porous 316L stainless steel.

Microstructural Evolution during High-Temperature Oxidation of Ti2AlN Ceramics

2010 ◽  
Vol 65 ◽  
pp. 106-111
Author(s):  
Bai Cui ◽  
Rafael Sa ◽  
Daniel Doni Jayaseelan ◽  
Fawad Inam ◽  
Michael J. Reece ◽  
...  
Keyword(s):  
High Temperature ◽  
Microstructural Evolution ◽  
High Temperature Oxidation ◽  
Oxidation Mechanism ◽  
X Ray Diffraction ◽  
Temperature Oxidation ◽  
X Ray ◽  
Oxidation In Air ◽  
Α Al2o3 ◽  
Increasing Temperature

Microstructural evolution of Ti2AlN ceramics during high-temperature oxidation in air has been revealed by X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEGSEM), and energy-dispersive spectroscopy (EDS). After oxidation below 1200 °C, layered microstructures formed on Ti2AlN surfaces containing anatase, rutile, and α-Al2O3. Above 1200 °C, more complex layered microstructures formed containing Al2TiO5, rutile, α-Al2O3, and continuous void layers. With increasing temperature, anatase gradually transformed to rutile, and TiO2 reacted with α-Al2O3 to form Al2TiO5. Based on these microstructural observations, an oxidation mechanism for Ti2AlN ceramics is proposed.

Vacuum-arc chromium-based coatings for protection of zirconium alloys from the high-temperature oxidation in air

2015 ◽  
Vol 465 ◽  
pp. 400-406 ◽  
Author(s):  
А.S. Kuprin ◽  
V.А. Belous ◽  
V.N. Voyevodin ◽  
V.V. Bryk ◽  
R.L. Vasilenko ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Zirconium Alloys ◽  
Vacuum Arc ◽  
Temperature Oxidation ◽  
Oxidation In Air

Features of high-temperature oxidation in air of silver and alloy Ag-Cu, and adsorption of oxygen on silver

2006 ◽  
Vol 45 (9-10) ◽  
pp. 476-480 ◽  
Author(s):  
V. A. Lavrenko ◽  
A. I. Malyshevskaya ◽  
L. I. Kuznetsova ◽  
V. F. Litvinenko ◽  
V. N. Pavlikov
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxidation In Air

High Temperature Oxidation Effect on the Dissolution Rate of Hot-Dip Aluminized Steel in Aluminum Melt

2014 ◽  
Vol 970 ◽  
pp. 248-251
Author(s):  
Ayeh Mohsenifar ◽  
Mohammad Reza Aboutalebi ◽  
S. Hossein Seyedein
Keyword(s):  
High Temperature ◽  
Dissolution Rate ◽  
High Temperature Oxidation ◽  
Molten Aluminum ◽  
Low Carbon Steel ◽  
Isothermal Oxidation ◽  
Coated Sample ◽  
Low Carbon ◽  
Temperature Oxidation ◽  
Oxidation In Air

Hot dip aluminizing of low carbon steel followed by high temperature oxidation in air was carried out to evaluate the dissolution rate of coated sample in molten aluminum. The microstructure of oxide and aluminide layers was investigated using scanning electron microscopy and X-ray diffraction methods. The characterization of the coating showed that Fe2Al5 has been the major phase formed on the surface of specimen before high temperature oxidation. Isothermal oxidation of the coating as resulted in the formation of Al2O3 while Fe2Al5 phase transformed into FeAl and Fe3Al phases. The coated samples were further subjected to corrosion in molten aluminum. It was proved that the oxide layer formed on the coating and developed FeAl and Fe3Al intermetallic phases play the major role in protecting the specimen from corrosion in molten aluminum.

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