Cyclic Oxidation Performance of Si-Aluminide/MCrAlY Coating on Ni-Base GTD-111 Superalloy

2017 ◽  
Vol 889 ◽  
pp. 159-164
Author(s):  
K. Shirvani ◽  
S.V. Miraboutalebi
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Test Results ◽  
Mcraly Coating ◽  
Mcraly Coatings ◽  
Silica Scale ◽  
Spray Technique ◽  
Oxidation Performance ◽  
Metal Spray

A slurry aluminising process was utilised to produce duplex Si-modified aluminide MCrAlY coatings for superalloy GTD-111. MCrAlY coating was applied by means of high velocity oxy-fuel (HVOF) metal spray technique. Cyclic oxidation behaviour of the aluminide/MCrAlY coating were compared with plain MCrAlY coating. Oxidation performance of the coated samples was investigated by exposing samples to 1 h cyclic oxidation at 1100 °C. Oxidation test results demonstrate the Si-aluminide/MCrAlY coating exhibited much better oxidation resistance than the the uncoated superalloy due to the superior oxidation resistance of the alumina-silica scale at 1100 °C.

Oxidation Behaviour of MCrAlY and MCrAlY +ZrO2 Coatings on Ni-Based IC6 Superalloy

2010 ◽  
Vol 650 ◽  
pp. 210-213 ◽  
Author(s):  
Di He ◽  
Shu Suo Li ◽  
Ya Fang Han
Keyword(s):  
Heat Treatment ◽  
Plasma Spray ◽  
Oxidation Product ◽  
Oxidation Kinetic ◽  
Oxidation Behaviour ◽  
Zro2 Coating ◽  
Mcraly Coating ◽  
Mcraly Coatings ◽  
Spray Technique ◽  
Α Al2o3

MCrAlY coatings were deposited on Ni-based IC6 superalloy by HVOF(high velocity oxy-fuel), and the ZrO2 coatings were prepared using plasma spray technique. The oxidation kinetic curves of the IC6 superalloy were obtained after the heat treatment. The results indicated that the oxidation resistance of IC6 superalloy was markedly improved by coatings with MCrAlY and MCrAlY+ZrO2. The oxidation product of the MCrAlY coating mainly consisted of α-Al2O3,NiO at 1100°C, oxidation product was not found on the MCrAlY+ZrO2 coating at 1100°C.

The Effect of Coatings on the Cyclic Oxidation Behaviour of Ti6Al4V at 750°C

2011 ◽  
Vol 393-395 ◽  
pp. 428-435 ◽  
Author(s):  
Ying Yuan Teng ◽  
Qian Chen ◽  
Li Xin
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Ti6al4v Alloy ◽  
Effective Protection ◽  
Tialsin Coating ◽  
Substrate Alloy

For improvement of the cyclic oxidation resistance of the Ti6Al4V alloy, multi-layered Ti50Al50N/Ti70Al30N and mono-layered Ti60Al30Si10N were deposited on the alloy. It has been found that both coatings provide an effective protection for substrate alloy and the cyclic oxidation resistance of the TiAlSiN coating is better. After cyclic oxidation, it has been found that N diffused into the substrate alloy.

Influence of Ru, Mo and Ir on the Behavior of Ni-Based MCrAlY Coatings in High Temperature Oxidation

2014 ◽  
Author(s):  
Kang Yuan ◽  
Ru Lin Peng ◽  
Xin-Hai Li ◽  
Sten Johansson ◽  
Yan-Dong Wang
Keyword(s):  
High Temperature ◽  
Microstructural Evolution ◽  
Structure Study ◽  
Micro Structure ◽  
Temperature Oxidation ◽  
Coating Surface ◽  
Mcraly Coating ◽  
Mcraly Coatings ◽  
Oxidation Performance ◽  
Temperature Exposure

To improve the oxidation/corrosion resistance of MCrAlY coatings (M for Ni and/or Co), elements like Y, Si and Ta have been added into the coatings in past decades. In this study the oxidation performance of a Ni-based MCrAlY coating with small proportion of Ru, Mo and/or Ir were investigated after high-temperature exposure. The oxidation tests were carried out at 900°C, 1000°C or 1100°C. The micro structure study showed that the addition of Ru, Mo and/or Ir had significant influence on the oxidation behavior at the coating surface and the microstructural evolution in the material. The microstructural evolution was quantitatively evaluated by measuring the phase degradation of β-NiAl in the coating and γ′-Ni3Al in the substrate of superalloy. Since no oxides of Ru, Mo and Ir were found on the coating surface, it was believed that the effects by those elements were mainly due to their dissolution in the metallic phases in the coatings.

Oxidation Behaviour of Zirconia-Sialon Composites

1992 ◽  
Vol 287 ◽  
Author(s):  
Yibing Cheng ◽  
Derek P. Thompson
Keyword(s):  
Structural Change ◽  
Oxidation Resistance ◽  
Diffusion Rate ◽  
Oxidation Behaviour ◽  
Oxidation Performance ◽  
Zirconia Phase ◽  
O Phase

ABSTRACTIn yttria densified ZrO2-sialon composites, an increase in β′:O′-sialon ratio results in a structural change in the zirconia phase because an increasing amount of nitrogen dissolves in the zirconia structure as the overall composition becomes increasingly nitrogen rich. Both ZrN and nitrogen-containing zirconia (N-ZrO2) are observed in the β′-ZrO2 composite and these phases show a poor oxidation performance above 600°C. However, the introduction of small amounts of O′ phase into the β′-ZrO2 composite has provided an effective oxygen-rich barrier to reduce the diffusion rate of nitrogen in zirconia and therefore O′-β′-ZrO2 composites showed superior oxidation resistance compared with β′-ZrO2 materials at temperatures between 600 and 1200°C.

Comparative Study of the Cyclic Oxidation Resistance of NiCrAlY and NiCoCrAlY Coatings

2013 ◽  
Vol 652-654 ◽  
pp. 1810-1813 ◽  
Author(s):  
Jian Ming Liu ◽  
Yue Guang Yu ◽  
Xian Jing Ren ◽  
De Ming Zhang ◽  
Jie Shen
Keyword(s):  
Surface Morphology ◽  
Comparative Study ◽  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Curve Shape ◽  
Free Standing ◽  
Coating Surface ◽  
Mcraly Coating ◽  
Nicraly Coating ◽  
The Difference

The free standing NiCrAlY and NiCoCrAlY coating samples were prepared by HVOF. The cyclic oxidation resistance of the coatings was evaluated and the coating surface morphology was investigated by SEM. The MCrAlY coating CTE was tested. The results show that the NiCoCrAlY coating exhibits better oxidation resistance than the NiCrAlY coating and the difference in MCrAlY CTE curve shape is considered as the main reason.

Long-Term, Cyclic Oxidation Behaviour of Alumina- and Chromia-Forming Alloys

2005 ◽  
Vol 237-240 ◽  
pp. 1107-1114 ◽  
Author(s):  
Renata Bachorczyk Nagy ◽  
Richard J. Fordham
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Oxide Scale ◽  
Water Vapour ◽  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Reactive Elements ◽  
Funded Project

The oxidation resistance behaviour of a number of surface-treated FeCrAl commercial alloys and some model alloys of well-defined composition, incorporating a range of reactive elements in trace amounts, has been studied under thermal cyclic conditions in air with and without additions of water vapour. Additions of reactive elements such as Zr, La, Y, Hf modify the oxidation resistance behaviour of FeCrAl-alloys by improving the scale adherence and consequently may extend the lifetime of FeCrAl steels. The presence of the water vapour can affect oxidation in a number of different ways. Our results may indicate that high content of water vapour can cause the lives of such alloys to be decreased. This work forms part of a larger European-funded project to evaluate physical properties, microstructural features, oxidation/corrosion resistance and lifetime improvement. The correlation between alloy parameters and lifetime; as well as the modeling of oxide scale behaviour as function of cycling conditions is also studied.

scholarly journals A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Farzin Ghadami ◽  
Alireza Sabour Rouh Aghdam ◽  
Soheil Ghadami
Keyword(s):  
Electron Microscope ◽  
Oxidation Resistance ◽  
Photoelectron Spectroscopy ◽  
Oxidation Behavior ◽  
Early Stage ◽  
Deposition Process ◽  
Nanocrystalline Powders ◽  
X Ray ◽  
Mcraly Coating ◽  
Mcraly Coatings

AbstractConventional and nanocrystalline MCrAlY coatings were applied by the high-velocity oxy-fuel (HVOF) deposition process. The ball-milling method was used to prepare the nanocrystalline MCrAlY powder feedstock. The microstructure examinations of the conventional and nanocrystalline powders and coatings were performed using X-ray diffraction (XRD), high-resolution field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). Williamson–Hall analyzing method was also used for estimation of the crystalline size and lattice strain of the as-milled powders and sprayed coatings. Owing to the investigation of the oxidation behavior, the freestanding coatings were subjected to isothermal and cyclic oxidation testing at 1000 and 1100 °C under static air. The results showed that the conventional as-sprayed MCrAlY coating had a parabolic behavior in the early stage and prolonged oxidation process. On the contrary, in the case of the nanocrystalline MCrAlY coating, the long-term oxidation behavior has deviated from parabolic to sub-parabolic rate law. Moreover, the results also exemplified that the nanocrystalline MCrAlY coating had a greater oxidation resistance following the creation of a continuous and slow-growing Al2O3 scale with a fine-grained structure. The nucleation and growth mechanisms of the oxides formed on the nanocrystalline coating have also been discussed in detail.

Preparation and Oxidation Behaviour of an Al-Si Coating on a Ni3Al Based Single Crystal Superalloy IC21

2013 ◽  
Vol 747-748 ◽  
pp. 575-581 ◽  
Author(s):  
Yu Zhuo Liu ◽  
Qiong Wu ◽  
Shu Suo Li ◽  
Yue Ma ◽  
Sheng Kai Gong
Keyword(s):  
Phase Transformation ◽  
Oxidation Resistance ◽  
Outer Layer ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Oxidation Behaviour ◽  
Oxide Scales ◽  
Outward Diffusion ◽  
Microstructure Change ◽  
Β Phase

An Al-Si coating was prepared on IC21 alloy by powder pack cementation. The cyclic oxidation tests were carried out at 1150 in air for up to 100 h. The results indicate that the oxidation resistance of IC21 alloy is significantly improved by the Al-Si coating due to the presence of Ni2Al3and β-NiAl enriched outer layer, and Si can effectively supress the outward diffusion of Mo. The oxide scales mainly consist of α-Al2O3, which is the favorite to the oxidation resistance. Phase transformation occurred from β-NiAl to γ-Ni3Al and γ-Ni in the coating during oxidation. The coating still remained a certain amount of β phase after oxidation for 100h, which indicate a good protection. The microstructure change evolution was characterized, and the oxidation behavior of the coating was discussed.

scholarly journals High-Temperature Oxidation Performance of Mo-Si-B Alloys: Current Results, Developments and Opportunities

2011 ◽  
Vol 278 ◽  
pp. 587-592 ◽  
Author(s):  
Steffen Burk ◽  
Hans Jürgen Christ
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
Base Material ◽  
Protective Oxide ◽  
Temperature Oxidation ◽  
Linear Rate ◽  
Silica Scale ◽  
Three Phase ◽  
Oxidation Performance ◽  
High Temperature Components

Ni-base superalloys are approaching the melting point as their fundamental limitation. For high-temperature components one possibility aiming at a further increase of efficiency, e.g. of jet turbines, is the use of refractory metals. Mo as base material is suitable for operating temperatures far beyond 1200°C. As a consequence of the formation of volatile Mo-oxides, it exhibits no intrinsic oxidation resistance when exceeding 700°C. Mo-Si-B alloys have melting points around 2000°C and retain good mechanical properties and oxidation resistance at very high temperatures. In air, the three-phase Mo-Si-B alloy dealt with in this paper shows excellent oxidation behaviour between 900°C-1300°C as a consequence of the formation of a protective silica scale. Below 900°C, alloys of this class suffer from catastrophic oxidation, leading to an evaporation of Mo-oxide and giving rise to a linear rate law of the weight loss. A protective oxide layer is not formed as a consequence of simultaneous and competitive Mo- and Si-oxide formation. Several approaches are possible to improve the oxidation performance of Mo-Si-B alloys, especially in this moderate temperature range. These include classical alloying, e.g. with Cr aiming for protective Cr-oxide scales, addition of small amounts of reactive elements for microstructure-refinement as well as selective oxidation of silica in oxygen-deficient atmospheres prior to operation in air. The results presented show promising opportunities and indicate that an oxidation protection from room temperature up to 1300°C requires a combination of the suggested approaches.

STUDY ON CYCLIC OXIDATION RESISTANCE OF HIGH NIOBIUM CONTAINING TiAl BASE ALLOY WITH ERBIUM

2013 ◽  
Vol 49 (11) ◽  
pp. 1369 ◽  
Author(s):  
Ziqi GONG ◽  
Ziyong CHEN ◽  
Lihua CHAI ◽  
Zhilei XIANG ◽  
Zuoren NIE
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Base Alloy
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