Oxidation behavior of a nanocrystalline coating with low Ta content at high temperature

2021 ◽  
Vol 180 ◽  
pp. 109182
Author(s):  
Lanlan Yang ◽  
Jinlong Wang ◽  
Ruize Yang ◽  
Shasha Yang ◽  
Yixuan Jia ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxidation Behavior ◽  
Nanocrystalline Coating

scholarly journals Effect of γ′ Phase Elements on Oxidation Behavior of Nanocrystalline Coatings at 1050 °C

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 202
Author(s):  
Jinlong Wang ◽  
Lanlan Yang ◽  
Shasha Yang ◽  
Yixuan Jia ◽  
Minghui Chen ◽  
...  
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Magnetron Sputtering ◽  
Oxide Scale ◽  
Oxidation Behavior ◽  
Titanium Oxides ◽  
Al2o3 Scale ◽  
Nanocrystalline Coating ◽  
Substrate Alloy

To study the effect of γ′ phase elements on the oxidation behavior of nanocrystalline coatings, two comparable nanocrystalline coating systems were established and prepared by magnetron sputtering. The oxidation experiments of the nanocrystalline coatings on the K38G and N5 superalloys were carried at 1050 °C for 100 h, respectively. The chemical composition of the above coatings is the same as the substrate alloy, including the γ′ elements, such as Al, Ta, and Ti. After serving at a high temperature for certain periods, their oxides participated and then affected the oxidation behavior of the coatings. The Al2O3 scale can be formed on the N5 coating, which cannot be formed on the K38G coating. Tantalum and titanium oxides can be detected on the oxide scale, which ruin its purity and integrity.

scholarly journals Exploring the Effect of Silicon on the High Temperature Corrosion of Lean FeCrAl Alloys in Humid Air

2021 ◽  
Author(s):  
T. Sand ◽  
A. Edgren ◽  
C. Geers ◽  
V. Asokan ◽  
J. Eklund ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Oxidation Behavior ◽  
High Temperature Corrosion ◽  
The Other ◽  
Oxide Scales ◽  
Protective Oxide ◽  
New Approach ◽  
Fecral Alloys ◽  
Cr Evaporation

AbstractA new approach to reduce the chromium and aluminium concentrations in FeCrAl alloys without significantly impairing corrosion resistance is to alloy with 1–2 wt.% silicon. This paper investigates the “silicon effect” on oxidation by comparing the oxidation behavior and scale microstructure of two FeCrAl alloys, one alloyed with silicon and the other not, in dry and wet air at 600 °C and 800 °C. Both alloys formed thin protective oxide scales and the Cr-evaporation rates were small. In wet air at 800 °C the Si-alloyed FeCrAl formed an oxide scale containing mullite and tridymite together with α- and γ-alumina. It is suggested that the reported improvement of the corrosion resistance of Al- and Cr-lean FeCrAl’s by silicon alloying is caused by the appearance of Si-rich phases in the scale.

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