Improvement of oxidation-resistance of NiCrAlY coatings by application of CrN or CrON interlayer

2008 ◽  
Vol 23 (2) ◽  
pp. 341-352 ◽  
Author(s):  
W.Z. Li ◽  
Y. Yao ◽  
Q.M. Wang ◽  
Z.B. Bao ◽  
J. Gong ◽  
...  
Keyword(s):  
Diffusion Barrier ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Coating System ◽  
Effective Protection ◽  
Rapid Degradation ◽  
Crn Coating ◽  
Ion Plating ◽  
Oxidation Performance ◽  
Better Than

NiCrAlY coatings with and without CrN or CrON interlayer as diffusion barrier were deposited on superalloy DSM11 by arc ion plating (AIP). The oxidation performance of the coating systems was evaluated by isothermal oxidation tests at 1100 °C for 100 h. The element interdiffusion and oxidation behavior of the coating systems were described. It was found that the NiCrAlY coatings provided protective effect for the DSM11 substrate. However, serious interdiffusion between the coatings and substrate resulted in rapid degradation of the coatings. The addition of CrN or CrON interlayer between the coatings and substrate markedly decreased the interdiffusion. CrON interlayer performed better than CrN interlayer, which was attributed to the excellent diffusion barrier ability of Al2O3 layer formed in the interlayer at high temperature. Also, the NiCrAlY/CrON coating system exhibited more effective protection for DSM11 than the NiCrAlY/CrN coating system.

Oxidation behavior of platinum–aluminum alloys and the effect of Zr doping

1999 ◽  
Vol 14 (12) ◽  
pp. 4531-4540 ◽  
Author(s):  
E. C. Dickey ◽  
B. A. Pint ◽  
K. B. Alexander ◽  
I. G. Wright
Keyword(s):  
Aluminum Alloys ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Consumption Rate ◽  
Isothermal Oxidation ◽  
Metal Consumption ◽  
Oxide Interface ◽  
Spatially Resolved ◽  
Oxidation Performance ◽  
Better Than

The isothermal and cyclic oxidation behavior of PtAl and PtAl + Zr was studied followed by postoxidation microstructural and microchemical analyses. Their isothermal oxidation performance at 1200 °C was similar to that of NiAl and NiAl + Zr. In short (1-h) cycles, the cyclic oxidation resistance of undoped PtAl was found to be substantially better than NiAl. However, with longer (100-h) cycles, little improvement in the metal consumption rate was observed relative to NiAl. The addition of Zr to PtAl significantly improved cyclic oxidation performance in both short- and long-cycle tests. Spatially resolved energy dispersive spectroscopy indicated Zr segregation to both the metal–oxide interface and Al2O3 grain boundaries.

Structure and Oxidation Behavior of Gradient Zr/ZrN/Zr Diffusion Barrier on the Ni-Based Superalloy by Arc Ion Plating

2010 ◽  
Vol 97-101 ◽  
pp. 1479-1483
Author(s):  
Yan Cai ◽  
Chun Hu Tao ◽  
Feng Lu ◽  
Jian Ping Li
Keyword(s):  
High Temperature ◽  
Diffusion Barrier ◽  
High Temperature Oxidation ◽  
Oxidation Behavior ◽  
Middle Layer ◽  
Temperature Oxidation ◽  
Arc Ion Plating ◽  
Ion Plating ◽  
Gradient Diffusion ◽  
High Temperature Oxidation Behavior

Gradient Zr/ZrN/Zr layer was deposited as a diffusion barrier between the NiCrAlYSi The overlay coating and Ni-base superalloy DZ125 by arc ion plating(AIP). The microstructure and high-temperature oxidation behavior of the diffusion barrier were studied. The results show that the gradient diffusion barrier is homogeneous and compact, and has strong bond strength with the substrate. The diffusion barrier is composed of three layers, among which the inner and outer layers are rich in Zr, and the middle layer is rich in ZrN. The main phase structure of the diffusion barrier is ZrN(200). During high temperature oxidation at 1100°C, the Zr/ZrN/Zr/HY3 compound coating system presents excellent oxidation resistance.

Nanolayered CrN/TiAIN Coatings Synthesized by Ion Plating Technology for Tribological Application on Piston Rings

2011 ◽  
Vol 216 ◽  
pp. 430-434 ◽  
Author(s):  
Zhi Hai Cai ◽  
Ping Zhang ◽  
Yue Lan Di
Keyword(s):  
Plastic Deformation ◽  
Composite Films ◽  
Piston Rings ◽  
Crn Coating ◽  
Ion Plating ◽  
Eds Analysis ◽  
Tribological Application ◽  
Increase Service Life ◽  
Crn Coatings ◽  
Better Than

By using the ion plating technology,the multilayered CrN/TiAlN as well as monolayered CrN and TiAlN coatings were made on the suface of piston rings to improve its tribological properties and increase service life using Cr and Ti50Al50 alloy cathodes. EDS analysis showed that the main compositions of CrN/TiAlN coatings are Cr30.61%,Ti 20.42%,Al 13.88% and N 35.10%. The preferred orientation was changed from (111) in CrN and TiAlN monolayered coatings to (220) plane in the multilayered CrN/TiAlN coatings. The multilayered CrN/TiAlN coatings had smaller crystallite size than the monolayered CrN coatings. The multilayered TiAlN/CrN coating with rotational speed at 1.5 rpm exhibited the highest H3/E2 ratio value of 0.23 GPa, indicating the best resistance to plastic deformation, among the studied CrN, TiAlN and multilayered TiAlN/ CrN coatings. The CrAlTiN composite films performs better than binary CrN as well as the Cr plating in teams of hardness and wear resistance at high temperature.

Oxidation Behavior of Nickel-Base Single-Crystal Superalloy with Rhenium-Base Diffusion Barrier Coating System at 1,423 K in Air

2007 ◽  
Vol 68 (5-6) ◽  
pp. 343-363 ◽  
Author(s):  
Toshio Narita ◽  
Fengqun Lang ◽  
Kemas Zaini Thosin ◽  
Takayuki Yoshioka ◽  
Takeshi Izumi ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffusion Barrier ◽  
Oxidation Behavior ◽  
Single Crystal Superalloy ◽  
Coating System ◽  
Barrier Coating ◽  
Nickel Base

Formation and Oxidation Behavior of a Diffusion-Barrier-Coating System on a Ni–Mo base Alloy at 1,373 K in Air

2007 ◽  
Vol 68 (5-6) ◽  
pp. 331-342 ◽  
Author(s):  
Yuichi Katsumata ◽  
Takayuki Yoshioka ◽  
Kemas Zaini Thosin ◽  
Takumi Nishimoto ◽  
Takeshi Izumi ◽  
...  
Keyword(s):  
Diffusion Barrier ◽  
Oxidation Behavior ◽  
Base Alloy ◽  
Coating System ◽  
Barrier Coating

scholarly journals Studies on the Oxidation Behavior of a Designed Nanocrystalline Coating on K38 Alloy at 1050 °C

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1188
Author(s):  
Jinlong Wang ◽  
Bo Meng ◽  
Wenyao Sun ◽  
Lanlan Yang ◽  
Minghui Chen ◽  
...  
Keyword(s):  
Oxidation Behavior ◽  
Coating System ◽  
Nanocrystalline Coating ◽  
2Nd Generation ◽  
Topologically Close Packed ◽  
Significant Difference ◽  
Oxidation Performance ◽  
Substrate Alloy ◽  
New Framework

A new framework for a nanocrystalline coating system is established and prepared to study the oxidation behavior with a significant difference in elemental composition. K38 superalloy is selected as a substrate alloy and the composition of the 2nd-generation single-crystal superalloy Rene N5 is used as the sputtered nanocrystalline coating. The oxidation behavior of the newly designed nanocrystalline coating is comparatively studied with the original K38 coating and its substrate alloy at 1050 °C for 500 h. Moreover, microstructure evolution on the interface is used for studying the influence of element interdiffusion behavior on the substrate alloy. Results show that the nanocrystalline coatings increase the oxidation performance of alloys at 1050 °C for 100 h. The sputtered SN-N5 nanocrystalline coating exhibits the best oxidation resistance among the three groups of specimens for 500 h. Interdiffusion occurred and is observed on the SN-N5 coating after long-term oxidation. However, no topologically close-packed phases participated in the substrate alloy.

scholarly journals Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1421
Author(s):  
Jianxiu Chang ◽  
Wenhao Feng ◽  
Wenwen Zhao ◽  
Hongmin Jia ◽  
Yanming Liu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Nitride Layer ◽  
Oxidation Products ◽  
Competitive Growth ◽  
X Ray Diffraction ◽  
Al2o3 Layer ◽  
Oxidation Performance

The relative content of strengthening element tantalum (Ta) and oxidation-resistant element chromium (Cr) is an essential value for superalloys to obtain an excellent combination of oxidation resistance and mechanical properties. In the present paper, the isothermal oxidation behavior of several single crystal Ni-base superalloys with different Ta/Cr (wt. %, similarly hereinafter) ratios at 1000 °C in static air has been systematically investigated to explore the optimal Ta/Cr for excellent oxidation resistance. A detailed microstructure study using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and an electro-probe microanalyzer (EPMA) was performed to reveal the oxidation products and mechanisms. For all alloys, a three-layer structured scale consisting of an outer (Cr, Al, Ti, Ni, Ta)-O layer, an inner Al2O3 layer and an inner nitride layer was formed. As Ta/Cr increased, the amounts of Ta-containing products, cracks, holes and inner nitride increased. Meanwhile, the completeness of the Al2O3 layer got worse. It was shown that if Ta/Cr ≤ 0.5, Ta increased the growth rate of Cr2O3 via the doping effect induced by Ta cations. If Ta/Cr > 0.5, Ta reduced the completeness of Cr2O3 through competitive growth of Ta2O5 and Cr2O3. A good oxidation performance can be expected with the value Ta/Cr ≤ 0.5.

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