The halogen effect for improving the oxidation resistance of TiAl-alloys

2005 ◽  
Vol 22 (3-4) ◽  
pp. 309-314 ◽  
Author(s):  
A. Donchev ◽  
H.-E. Zschau ◽  
M. Schütze
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys ◽  
Halogen Effect

The halogen effect for improving the oxidation resistance of TiAl-alloys

2005 ◽  
Vol 22 (3) ◽  
pp. 309-314 ◽  
Author(s):  
A. Donchev ◽  
H.-E. Zschau ◽  
M. Schütze
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys ◽  
Halogen Effect

Oxidation of TiAl Alloys Coated by Fluorine Resin in SO2 Containing Atmosphere

2010 ◽  
Vol 654-656 ◽  
pp. 562-565
Author(s):  
Aleksander Gil ◽  
Zbigniew Żurek ◽  
Adam Stawiarski
Keyword(s):  
Mechanical Properties ◽  
Ion Implantation ◽  
Surface Treatment ◽  
Oxidation Resistance ◽  
Organic Compounds ◽  
Oxidation Behavior ◽  
Alumina Scale ◽  
Tial Alloys ◽  
Temperature Range ◽  
Halogen Effect

There are several ways to improve the oxidation resistance of TiAl alloys. One of them is alloying with elements such as Nb, Ta, W, Si, Ag, Zr or Hf. However, bulk alloying influences the mechanical properties. Surface treatment of TiAl alloys by the small amounts of halogens leads to the formation of the protective alumina scale (“halogen effect”). The halogens can be applied by ion techniques (ion implantation, plasma immersion implantation) but also by spraying or dipping with halogen-containing inorganic and organic compounds. Deposition of the fluorine-containing resin on the surface of TiAl alloys is the easiest way to achieve the best results. SO2 impurity in air significantly influences oxidation behavior of TiAl alloys. In this work the results of the oxidation of a Ti-48Al-2Cr alloy coated with a fluorine-containing resin in the synthetic air and air containing 1% SO2 were presented. The oxidation runs were carried out in the temperature range 800-1000°C.

Improvement of the Oxidation Resistance of TiAl Alloys Using Controlled Gaseous Fluorination

2019 ◽  
Vol 11 (15) ◽  
pp. 37-48 ◽  
Author(s):  
Patrick J. Masset ◽  
Michael Schütze
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys

The effect of Ta additions on the oxidation resistance of SPS-produced TiAl alloys

2020 ◽  
Vol 106 (7-8) ◽  
pp. 3203-3215 ◽  
Author(s):  
Prince Valentine Cobbinah ◽  
Wallace Matizamhuka ◽  
Ronald Machaka ◽  
Mxolisi Bredon Shongwe ◽  
Yoko Yamabe-Mitarai
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys

CYCLIC OXIDATION OF Ti-48%Al-2%Cr-2%Nb-(0~1%)W ALLOYS BETWEEN 800 AND 1000°C IN AIR

2010 ◽  
Vol 17 (02) ◽  
pp. 141-146
Author(s):  
SANG-HWAN BAK ◽  
DONG YI SEO ◽  
SEON-JIN KIM ◽  
JAE CHUN LEE ◽  
DONG BOK LEE
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Alloying Elements ◽  
Tial Alloys ◽  
Oxidation Characteristics

Ti-48%Al-2%Cr-2%Nb-(0, 0.5, 1) at.%W alloys were synthesized via the powder metallurgical route, and cyclically oxidized at 800, 900, or 1000°C in air for up to 100 h in order to find the effects of W on their oxidation characteristics. At 800°C, they oxidized relatively slowly, and the scales were thin and adherent. At 900°C, the scales began to spall locally. At 1000°C, they spalled repetitively during oxidation. Cr , Nb , and W improved the cyclic oxidation resistance of TiAl alloys. The oxides formed were TiO2 and Al2O3 , which contained the alloying elements of Cr , Nb , and W . Nitrides formed were TiN and Ti2AlN .

Influence of Co to Ni ratio in γ′-strengthened model alloys on oxidation resistance and the efficacy of the halogen effect at 900 °C

2019 ◽  
Vol 156 ◽  
pp. 84-95 ◽  
Author(s):  
Martin Weiser ◽  
Mathias C. Galetz ◽  
Hans-Eberhard Zschau ◽  
Christopher H. Zenk ◽  
Steffen Neumeier ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Halogen Effect

scholarly journals Microstructure and Oxidation Behavior of NiCoCrAlY Coating With Different Sm2O3 Concentration on TiAl Alloy

2021 ◽  
Vol 8 ◽  
Author(s):  
X. Gong ◽  
R. R. Chen ◽  
Y. Wang ◽  
Y. Q. Su ◽  
J. J. Guo ◽  
...  
Keyword(s):  
Growth Rate ◽  
Grain Boundary ◽  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Tial Alloy ◽  
Oxidation Mechanism ◽  
Isothermal Oxidation ◽  
Outward Diffusion ◽  
Tial Alloys ◽  
Fine Grain

In order to improve the oxidation resistance of TiAl alloys, NiCoCrAlY coatings with different amounts of Sm2O3 were prepared by laser cladding on TiAl alloys. The microstructure and oxidation behavior of the coatings were investigated by isothermal oxidation tests at 900°C. The results indicated that the grains of the coatings were refined by Sm2O3. The fine grain reduced the crack sensitivity of the doped coatings and promoted the transformation of θ-Al2O3 to α-Al2O3. Therefore, the internal oxidation of the coatings and the growth rate of the oxide films were reduced. The segregation of Sm at grain boundary inhibited the outward diffusion of Ti, thus reducing the excessive oxidation of Ti. In addition, the oxidation mechanism of the coating was changed from simultaneous diffusion of Al and O to predominant inward diffusion of O. The oxidation resistance of the doped coatings was significantly improved. However, excessive Sm2O3 is detrimental to the improvement of the oxidation resistance. The oxidation resistance of 3 wt% Sm2O3 is the best.

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