The Inhibiting Effect of Reactive Element Oxides on the Pack Cementation Aluminide Coating Formation

2020 ◽  
Vol 51 (11) ◽  
pp. 5958-5964
Author(s):  
F. Ebadi ◽  
F. Shahriari Nogorani ◽  
F. Fatemi
Keyword(s):  
Aluminide Coating ◽  
Pack Cementation ◽  
Reactive Element ◽  
Inhibiting Effect ◽  
Coating Formation

Cyclic-Oxidation of RexOy-Modified Aluminide Coating

2012 ◽  
Vol 557-559 ◽  
pp. 1721-1726
Author(s):  
Yong Dong Wang ◽  
Yue Bo Zhou
Keyword(s):  
Composite Film ◽  
Cyclic Oxidation ◽  
Aluminide Coating ◽  
Pack Cementation ◽  
Reactive Element ◽  
Aluminide Coatings ◽  
Oxidation In Air

Reactive reactive element oxide RexOy (Re=Ce, Y)-modified aluminide coatings were developed by aluminizing the as-codeposited Ni-RexOy composite film using pack cementation method at 1100°C for 4 h. By comparison, aluminizing was also performed with the same condition on an as-deposited Ni film without RexOy particles. SEM/EDAX and TEM results indicated that the co-deposited CeO2 or Y2O3 particls were homogeneously dispersed in the finer-grain nanocrystalline Ni grains. The cyclic oxidation in air at 900°C indicated that the RexOy -modified aluminide coatings were profoundly spallation resistance as compared to the RexOy -free coatings due to the formation of a continuous adherent α-Al2O3 scale.

The Effects of Aluminum Activity on Aluminide Coating Formation of Nickel-Base Superalloy

2012 ◽  
Vol 198-199 ◽  
pp. 32-35
Author(s):  
Feng Zhou ◽  
Ming Gao ◽  
Ying Che Ma ◽  
Gan Feng Tu ◽  
Ke Wu Peng
Keyword(s):  
Phase Composition ◽  
Aluminide Coating ◽  
Diffusion Coating ◽  
Pack Cementation ◽  
Nickel Base Superalloy ◽  
Aluminum Activity ◽  
Coating Formation ◽  
Al Powder ◽  
Nickel Base ◽  
Base Superalloy

The effects of different pure Al compositon in the pack powder on aluminide coating formation of a new kind of Ni-Cr-W-Al nickel-base superalloy by pack cementation aluminizing was investigated. The content of pure Al powder is 15% and 30% in the aluminizing agent. The microstructure and phase composition of diffusion coating was studied.

Development and Oxidation of RexOy-Modified Aluminide Coating

2010 ◽  
Vol 142 ◽  
pp. 274-278 ◽  
Author(s):  
Jing Chong Zhang ◽  
Yue Bo Zhou
Keyword(s):  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Aluminide Coating ◽  
Composite Films ◽  
Pack Cementation ◽  
Reactive Element ◽  
Aluminide Coatings ◽  
Subsequent Step ◽  
Oxidation In Air

Reactive reactive element oxide RexOy (Re=Ce, Y)-modified aluminide coatings have been developed by the first step of co-electrodeposition of Ni with CeO2 or Y2O3 particls on pure Ni and the subsequent step of diffusional aluminizing on electrodeposited Ni-CeO2/or Y2O3 composite films using pack cementation method at 1100OC for 4 hr. By comparison, aluminizing was also performed with the same condition on an as-deposited Ni film without RexOy particles. The oxidation in air at 900OC indicated that the RexOy (Re=Ce, Y)-modified aluminide coatings were profoundly oxidation resistance as compared to the RexOy (Re=Ce, Y)-free coatings. The effect of CeO2 or Y2O3 on the oxidation behavior is discussed in detail.

Aluminide Coating Prepared on Ni-Base Superalloy by Pack Cementation

2013 ◽  
Vol 848 ◽  
pp. 11-17 ◽  
Author(s):  
Feng Zhou ◽  
Ming Gao ◽  
Gan Feng Tu ◽  
Kui Liu ◽  
Ke Wu Peng
Keyword(s):  
Aluminide Coating ◽  
Pack Cementation ◽  
Nickel Base Superalloy ◽  
Al Content ◽  
Coating Formation ◽  
Electron Microscopes ◽  
Nickel Base ◽  
Xrd Techniques ◽  
Scanning Electron Microscopes ◽  
Base Superalloy

Alumincoating was prepared on a Ni-Cr-W-Al nickel-base superalloy by pack cementation, the effects of Al content and aluminizing temperature on coating formation were investigated. Coating microstructures were investigated using optical and scanning electron microscopes, EDS and X-ray diffraction (XRD) techniques. The results showed that the coatings prepared at 800°C in the powders with 15%, 30% and 99% Al were different. NiAl3 coating was obtained in the conditions of aluminizing temperature of 700°C, 750°C, 850°C and of Al content of 99%.

Protective aluminide coating by pack cementation for Beta 21-S titanium alloy

2019 ◽  
Vol 160 ◽  
pp. 108165 ◽  
Author(s):  
N. Chaia ◽  
C.M.F.A. Cossu ◽  
L.M. Ferreira ◽  
C.J. Parrisch ◽  
J.D. Cotton ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Aluminide Coating ◽  
Pack Cementation

The oxidation performance for Zr-doped nickel aluminide coating by composite electrodepositing and pack cementation

2017 ◽  
Vol 123 ◽  
pp. 103-115 ◽  
Author(s):  
Yuhua Zhou ◽  
Xiaofeng Zhao ◽  
Chunshan Zhao ◽  
Wei Hao ◽  
Xin Wang ◽  
...  
Keyword(s):  
Nickel Aluminide ◽  
Aluminide Coating ◽  
Pack Cementation ◽  
Oxidation Performance

Aluminizing Coating Prepared on Oil Casing Steel N80 by Low-Temperature Pack Cementation

2011 ◽  
Vol 368-373 ◽  
pp. 2180-2184
Author(s):  
Yu Wang ◽  
Min Huang
Keyword(s):  
Corrosion Resistance ◽  
Low Temperature ◽  
Aluminide Coating ◽  
Electrochemical Corrosion ◽  
Hardness Test ◽  
Element Distribution ◽  
Pack Cementation ◽  
Mechanical Attrition ◽  
Pre Treatment ◽  
Steel Substrates

Aluminizing has been verified to be an effective way to improve the corrosion resistance of steel due to the formation of continuous Al2O3layer, but traditional aluminizing processing carried out at high temperature can not be used to prepare aluminide layer on the surface of oil casing steel. In this paper, an aluminide coating was prepared on oil casing steel N80 by a low-temperature pack cementation only at 803 K for 2 hours by adding zinc in the pack powder and pre-treatment of N80 substrate by surface mechanical attrition. The phase compostion, microstructure, element distribution and properties of as-aluminized oil casing steel N80 were characterized by means of XRD, SEM, EDS, micro-hardness test and electrochemical corrosion measurements. The results indicate that aluminide coating mainly consists of FeAl3, Fe2Al5 and FeAl. The continuous aluminide coating with an average thickness around 50 μm could be successfully formed on the surface of oil casing steel N80 which shows a good coherence with as-packed substrate. After preparation of aluminide coating, oil casing steel N80 shows a higher microhardness in the range of aluminizing coating than that of the virgin material because of the formation of iron aluminide. The exception noted is that the proposed low-temperature aluminizing processing does not have any damaging impact on the mechanical properties of steel substrates. Moreover, it is concluded that oil casing steel N80 with aluminizing coating shows a better corrosion resistance than that of original N80 by analyzing of electrochemical test results.

Sign in / Sign up

Export Citation Format

Share Document