Isothermal Oxidation Behavior of Ru Modified Aluminide Coating on a Fourth Generation Single Crystal Superalloy

Isothermal oxidation behavior of a 4th generation Ni-base single crystal superalloy with Pt-modified and Ru-modified aluminide coating was examined in a temperature range 1223 to 1373 K in air. Both Pt and Ru modification improve the oxidation resistance of a simple aluminide coating, especially above 1273 K. They allow thin protective and continuous Al2O3 scales to be intact for at least 500 h at temperatures up to 1323 K. However, the Pt modification drastically accelerates the formation of a secondary reaction zone (SRZ). This suggests that Pt promotes the formation of a topologically close-packed phase by lowering the solubility of refractory elements in γ-Ni. In contrast, the Ru modification reduces the SRZ, and is expected to enhance the phase stability under the coating by preventing the depletion of Ru due to its outward diffusion.

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Isothermal Oxidation Behavior of Ru Modified Aluminide Coating on a Fourth Generation Single Crystal Superalloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.512.111 ◽

2006 ◽

Vol 512 ◽

pp. 111-116 ◽

Cited By ~ 1

Author(s):

Yuki Matsuoka ◽

Kazuyoshi Chikugo ◽

Takakazu Suzuki ◽

Yasuo Matsunaga ◽

Shigeji Taniguchi

Keyword(s):

Phase Transformation ◽

Oxidation Behavior ◽

Coating Layer ◽

Aluminide Coating ◽

Isothermal Oxidation ◽

Fourth Generation ◽

Short Term ◽

Cross Sectional ◽

Local Oxidation ◽

Sectional Analysis

Ru coating prior to aluminizing is one of the effective methods to reduce the harmful intermediate layer that forms under the coating (SRZ) on a 4th generation Ni-base SC superalloy. This study examined the short-term isothermal oxidation behavior of this Ru-modified coating at 1373 K in air. Surface observation by SEM showed that the scale becomes flat and uniform in comparison to simple aluminide coating. XRD and cross-sectional analysis results also showed that phase transformation from β-NiAl to γ’-Ni3Al seldom occurs in the Ru-modified coating layer leading to the prevention of local oxidation.

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Effect of rhenium addition to a nickel-base single crystal superalloy on isothermal oxidation of the aluminide coating

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2004.05.008 ◽

2005 ◽

Vol 194 (1) ◽

pp. 111-118 ◽

Cited By ~ 19

Author(s):

C.T. Liu ◽

X.F. Sun ◽

H.R. Guan ◽

Z.Q. Hu

Keyword(s):

Single Crystal ◽

Aluminide Coating ◽

Isothermal Oxidation ◽

Single Crystal Superalloy ◽

Rhenium Addition ◽

Nickel Base

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Isothermal oxidation behavior of electrospark deposited NiCrAlY coatings on a Ni-based single-crystal superalloy

Materiali in tehnologije ◽

10.17222/mit.2018.210 ◽

2019 ◽

Vol 53 (3) ◽

pp. 389-394

Author(s):

C. Guo ◽

T. Liang ◽

F. Lu ◽

Z. Liang ◽

S. Zhao ◽

...

Keyword(s):

Single Crystal ◽

Oxidation Behavior ◽

Isothermal Oxidation ◽

Single Crystal Superalloy

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Isothermal oxidation behavior of single crystal superalloy DD6

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(11)61210-7 ◽

2012 ◽

Vol 22 (3) ◽

pp. 534-538 ◽

Cited By ~ 20

Author(s):

Zhen-xue SHI ◽

Jia-rong LI ◽

Shi-zhong LIU

Keyword(s):

Single Crystal ◽

Oxidation Behavior ◽

Isothermal Oxidation ◽

Single Crystal Superalloy

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Effect of Y on the Oxidation Behavior of a Directionally Solidified Ni-based Single Crystal Superalloy

10.21203/rs.3.rs-95133/v1 ◽

2020 ◽

Author(s):

Zihan Zhao ◽

Kai Guan ◽

Renjie Cui ◽

Jianchao Qin ◽

Zhaohui Huang

Keyword(s):

Weight Gain ◽

Single Crystal ◽

Oxide Scale ◽

Oxidation Rate ◽

Oxidation Behavior ◽

Isothermal Oxidation ◽

Oxidation Products ◽

Single Crystal Superalloy ◽

Directionally Solidified ◽

Oxidation Weight Gain

Abstract The effect of Y addition on the oxidation behavior of a Ni-based directionally solidified single crystal superalloy was investigated. Isothermal oxidation test for the samples with different-level Y addition was conducted at 1100℃ in air. The Y content of the samples was demarcated by the actual pickup amount resulted from ICP-AES test. It was found that the addition of Y increased the oxide resistance by an adhesive double-layer oxide scale which was composed of Al2O3 and spinel Ni(Cr,Al)2O4. With 70ppm Y addition, the oxidation weight gain was decreased from 12.6g/m2 for the alloy without Y addition to 5.3g/m2, and the oxidation rate was significantly decreased. Besides, the internal nitride also disappeared after Y doping because of the increasing oxidation scale adherence and the decreasing of oxidation products. In this study, 660ppm Y addition alloy showed the best oxidation resistance.

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