Effect of Al2O3 addition on the microstructure and oxidation behavior of SiC coating prepared by pack cementation on C/C composites

2021 ◽  
Author(s):  
Yangyang Liu ◽  
Qiang Miao ◽  
Wenping Liang ◽  
Hao Lin ◽  
Hanchun Ma ◽  
...  
Keyword(s):  
Oxidation Behavior ◽  
Pack Cementation ◽  
Al2o3 Addition

scholarly journals Development of Chromium and Aluminum Coatings on Superalloys by Pack-Cementation Technique

2011 ◽  
Vol 278 ◽  
pp. 491-496 ◽  
Author(s):  
Xiaver Ledoux ◽  
Michel Vilasi ◽  
Stéphane Mathieu ◽  
Pierre Jean Pantiex ◽  
Pascal Del-Gallo ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxidation Behavior ◽  
Chromium Concentration ◽  
Pack Cementation ◽  
High Temperature Creep ◽  
High Chromium ◽  
Nickel Iron ◽  
Aluminum Coatings ◽  
Steam Methane ◽  
Iron Chromium

Austenitic nickel-iron-chromium based superalloys are materials of choice for high temperature applications as they provide high temperature creep resistance associated with a suitable oxidation behavior in the temperature range of 600-1100°C. However, these properties are not sufficient for applications as Steam Methane Reformer (SMR). As a consequence, aluminum and chromium coatings are developed by the pack-cementation technique to improve their corrosion resistance. The oxidation behavior of the coated samples has been carried out in air at 1050°C. Chromium deposition leads to a layer of bcc chromium-iron solid solution. Oxidation tests indicated that a too high chromium concentration induces a too rapid growth of the chromia layer. In the case of aluminum coatings, a layer of -NiAl is formed at the surface of the alloy. It permits a significant decrease of the oxidation rate.

Effect of Pack Cementation Temperature on Oxidation Behavior of NiCoCrAl Coated Layer

2015 ◽  
Vol 1112 ◽  
pp. 353-358 ◽  
Author(s):  
Eni Sugiarti ◽  
Kemas A. Zaini ◽  
Yong Ming Wang ◽  
Naoyuki Hashimoto ◽  
Somei Ohnuki ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Oxidation Rate ◽  
Oxidation Behavior ◽  
Oxidation Mechanism ◽  
Intermediate Stage ◽  
Pack Cementation ◽  
Coated Sample ◽  
Initial Oxidation ◽  
Oxidation Stage ◽  
And Diffusion

The oxidation behavior of NiCoCrAl coatings deposited on carbon steel was evaluated at 800 °C for 100 h in atmospheric air. The effect of different coating process on the oxidation of carbon steel was studied. The oxidation mechanism was discussed based on oxidation rate, formation of oxide scale, and microstructure of the coated sample. The oxidation rate significantly increased owing to the formation of metastable Al2O3 during initial oxidation stage. The oxidation rate decreased due to the transformation from d, q to a-Al2O3 from the intermediate stage up to final stage of 100 h oxidation. The effect of pack cementation temperature contributed to the thickness and diffusion of coated elements. The experimental results showed that sample developed at 800 °C exhibited better oxidation resistance than sample developed at 900 and 1000 °C.

Oxidation Behavior of Mo-Based Alloys Coated with Silicide Using the Halide-Activated Pack Cementation Method

2003 ◽  
Vol 426-432 ◽  
pp. 1745-1750 ◽  
Author(s):  
Kazuhiro Ito ◽  
Taisuke Hayashi ◽  
Takeshi Murakami ◽  
Masaharu Yamaguchi
Keyword(s):  
Oxidation Behavior ◽  
Pack Cementation
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