Microstructure and Oxidation Resistance of an Aluminide Coating on the Nickel Based Superalloy Mar M247 Deposited by the CVD Aluminizing Process

2013 ◽  
Vol 58 (3) ◽  
pp. 697-701 ◽  
Author(s):  
M. Zielińska ◽  
M. Zagula-Yavorska ◽  
J. Sieniawski ◽  
R. Filip
Keyword(s):  
Aluminide Coating ◽  
Diffusion Coating ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Small Mass ◽  
Optical Microscope ◽  
Oxidation Test ◽  
Nickel Based Superalloy ◽  
Air Atmosphere ◽  
Mass Increase

Abstract An investigation was conducted to synthesize βNiAl coating on the nickel based superalloy Mar M247 in a chemical vapor deposition process (CVD). The low activity process of aluminizing was carried out for 8 hours at the temperature 1050°C. Surface morphology and cross-section microstructure of the diffusion coating were studied and compared by using an optical microscope, a scanning electron microscope (SEM) equipped with energy dispersive spectroscopy and an X-ray diffractometer. It was found that aluminide coating with the thickness of 37 μm consisted of two layers: an outer one and the inner interdiffusion one. The outer layer consists of single phase βNiAl. The inner one, consisted of βNiAl phase and carbides: MC and M23C6 types which were originally present in the substrate. Cyclic oxidation test was performed at 1000°C for 1000h in the air atmosphere. The aluminized samples exhibited a small mass increase and the α- Al2O3 oxide formed during oxidation test had a good adherence to the coating. The decrease of aluminum content in the coating with the prolongation of the oxidation time and the phase transformation of βNiAl to γ’ Ni3Al and to γNi solid solution were observed. The samples without the coating showed a strong mass decrease in comparison to the coated samples.

The Effect of the Aluminide Coating on the Thermal Properties and Oxidation Resistance of Inconel 625 Ni-Base Superalloy

2015 ◽  
Vol 227 ◽  
pp. 313-316 ◽  
Author(s):  
Maryana Zagula-Yavorska ◽  
Jan Sieniawski ◽  
Ryszard Filip ◽  
Marcin Drajewicz
Keyword(s):  
Thermal Diffusivity ◽  
Outer Layer ◽  
Aluminide Coating ◽  
Diffusion Coating ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Optical Microscope ◽  
Coated Sample ◽  
Inconel 625 ◽  
Base Superalloy

An investigation was conducted to synthesize βNiAl coating on the nickel based superalloy Inconel 625 in the low activity chemical vapor deposition process (CVD). The deposition was carried out for 8 hours at 1050°C using the BPXpro3252 IonBond company equipment. Surface morphology and cross-section microstructure of the diffusion coating were studied and compared using an optical microscope, an X-ray diffractometer and a scanning electron microscope (SEM) equipped with an energy dispersive spectroscope. It was found that 29 μm thick aluminide coating consisted of two layers: an outer one and the inner interdiffusion one. The outer layer consisted of the βNiAl phase. The inner one consisted of the βNiAl phase with chromium, molybdenum and niobium carbides (M23C6 and MC type) inclusions. Outer layer hardness was about 564 HV0.002 while interdiffusion layer hardness was about 725 HV0.002. Thermal diffusivity of Inconel 625 superalloy with and without coating was measured using a NETZSCH model 427 laser flash diffusivity apparatus. The thermal diffusivity measurements were conducted in the argon atmosphere at the temperature interval 20 - 1200 oC. Thermal diffusivity of the uncoated Inconel 625 Ni-base superalloy at the room temperature is about 2 mm2/s, while for the coated superalloy thermal diffusivity is about 2.8 mm2/s. The increase of the temperature from 20 to 1200 oC leads to the increase of the thermal diffusivity of the coated sample from 2.8 to 5.6 mm2/s. Cyclic oxidation tests for both coated and uncoated superalloys were performed at 1100°C for 1000 h in the air atmosphere. The aluminized samples exhibited a small mass increase and the α-Al2O3 scale was formed during the oxidation test.

Thermal Stability of Microstructure of Aluminide Layer Deposited by CVD Method on CMSX 4 Nickel Base Superalloy

2011 ◽  
Vol 674 ◽  
pp. 89-96 ◽  
Author(s):  
M. Yavorska ◽  
Jan Sieniawski
Keyword(s):  
Cross Section ◽  
Base Alloy ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Nickel Base Superalloy ◽  
Oxidation Test ◽  
Cvd Method ◽  
Air Atmosphere ◽  
Nickel Base ◽  
Aluminide Layer

In the paper the aluminide layer was deposited by CVD method on the CMSX 4 single crystal nickel base alloy. The aluminizing process was carried out at the 1050 °C during 8 h. The chemical vapor deposition process was performed by means of AlCl3 aluminum chloride. The effects of aluminizing were verified in microscopic examination (microstructure and depth layer) and chemical composition on the surface and cross-section of aluminide layer. The oxidation resistance in the air atmosphere at the 1100 °C during 1000 h was a criterion of efficiency of CVD process. The hardness distribution on the cross-section aluminide layer before and after oxidation test was investigated. The parabolic mass change was observed during oxidation. Under oxidation test during 120 h on the grain size of NiAl phase was observed the phase transformation β NiAl →Ni3Al. The increase of oxidation time causes decreasing of substrate hardness and stabilization of Topologically Closed Packed phases.

scholarly journals Aluminide Thermal Barrier Coating for High Temperature Performance of MAR 247 Nickel Based Superalloy

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 48
Author(s):  
Mateusz Kopec ◽  
Dominik Kukla ◽  
Xin Yuan ◽  
Wojciech Rejmer ◽  
Zbigniew L. Kowalewski ◽  
...  
Keyword(s):  
High Temperature ◽  
Stress Amplitude ◽  
Aluminide Coating ◽  
Chemical Vapor ◽  
Fatigue Tests ◽  
Protective Atmosphere ◽  
X Ray ◽  
Nickel Based Superalloy ◽  
Barrier Coating ◽  
Aluminide Layer

In this paper, mechanical properties of the as-received and aluminide layer coated MAR 247 nickel based superalloy were examined through creep and fatigue tests. The aluminide layer of 20 µm was obtained through the chemical vapor deposition (CVD) process in the hydrogen protective atmosphere for 8 h at the temperature of 1040 °C and internal pressure of 150 mbar. A microstructure of the layer was characterized using the scanning electron microscopy (SEM) and X-ray Energy Dispersive Spectroscopy (EDS). It was found that aluminide coating improve the high temperature fatigue performance of MAR247 nickel based superalloy at 900 °C significantly. The coated MAR 247 nickel based superalloy was characterized by the stress amplitude response ranging from 350 MPa to 520 MPa, which is twice as large as that for the uncoated alloy.

scholarly journals Diffusion-Controlled Growth and Microstructural Evolution of Aluminide Coatings on Superalloys and Steel

2017 ◽  
Vol 13 ◽  
pp. 167-195 ◽  
Author(s):  
Aloke Paul
Keyword(s):  
Microstructural Evolution ◽  
Aluminide Coating ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Controlled Growth ◽  
Aluminide Coatings ◽  
Diffusion Analysis ◽  
Nial Phase ◽  
Diffusion Controlled ◽  
Diffusion Rates

The diffusion-controlled growth and microstructural evolution at the interface of aluminide coatings and different substrates such as Ni-base superalloys and steel are reviewed. Quantitative diffusion analysis indicates that the diffusion rates of components in the β-NiAl phase increases with the addition of Pt. This directly reflects on the growth rate of the interdiffusion zone. The thickness and formation of precipitates increase significantly with the Pt addition. Mainly Fe2Al5phase grows during hot dip aluminization of steel along with few other phases with the very thin layer. Chemical vapor deposition process is being established for a better control of the composition of the Fe-aluminide coating on steel.

scholarly journals Protective Coatings and Degradation Experiences for First Stage Buckets on GE MS-5002B/C Gas Turbines

1996 ◽  
Author(s):  
Refrizal Boestaman ◽  
V. P. Swaminathan ◽  
H. L. Bernstein
Keyword(s):  
Gas Turbine ◽  
Firing Temperature ◽  
Gas Turbines ◽  
Single Phase ◽  
Protective Coatings ◽  
Aluminide Coating ◽  
Diffusion Coating ◽  
Chemical Vapor ◽  
Total Power ◽  
Platinum Aluminide

PT Arun operates 21 GE Model MS-5002 B/C gas turbines as mechanical drive with a total power of 514 MW, and a total of 2.7 million hours of accumulated operation. The first generations of simple cycle gas turbines were designed at 1700 F (927 C) firing temperature using first stage buckets design cast from IN-738LC and coated with a conventional 2-phase platinum aluminide coating (Pt-Al). Since 1989, the output power was increased by raising gas turbine firing temperature to 1770 F (965 C). This uprate was implemented by using first stage buckets cast from GTD-111 DS and coated with GT-29 Plus. Metallurgical examination of these coatings at various operating hours have been performed to check their performance and the cause of coating degradation. These results are considered for future coating selection. In the last two years PT Arun has explored a new single phase NiCoCrAlY coating and a single phase Pt-Al diffusion coating using chemical vapor disposition process as an alternate to GT-29 plus coating replacement. Both of these coatings are used at PT Arun and have accumulated 32,400 hours for NiCoCrAlY or GT-33 and 2880 hours for single phase Pt-Al or MDC-150L coating as of June 1996. The information regarding qualification of these alternate coatings (zero running hours) will be discussed in this paper.

The Influence of the Chemical Composition of Superalloys on the Oxidation Resistance of Aluminide Coating

2015 ◽  
Vol 227 ◽  
pp. 365-368
Author(s):  
Maryana Zagula-Yavorska ◽  
Jan Sieniawski ◽  
Ryszard Filip
Keyword(s):  
Chemical Composition ◽  
Oxidation Resistance ◽  
Aluminide Coating ◽  
Inconel 625 ◽  
Test Duration ◽  
Oxidation Test ◽  
Air Atmosphere ◽  
Aluminide Coatings ◽  
High Aluminum Content ◽  
High Aluminum

The aim of the present work was to determine the influence of chemical composition of the coating protected nickel based superalloys Inconel 713 LC, Inconel 625 and CMSX 4 on the oxidation resistance of aluminide coating. Protective aluminide coatings were deposited in the CVD process. The low activity aluminizing at the presence of AlCl3 and H2 was carried out. Cyclic oxidation test for both coated and uncoated superalloys was performed at 1100°C for 1000 h in the air atmosphere. Microstructure of aluminide coatings after oxidation test was investigated by a scanning electron microscopy (SEM) and an energy dispersive spectroscopy (EDS). The best oxidation resistance shows uncoated Inconel 713 LC superalloy. That is due to a relatively high aluminum content in this alloy. The aluminide coating deposited on the surface of Inconel 625 shows the largest oxidation resistance (insignificnt changes of mass for the whole test duration). Excellent oxidation resistance is a result of Al2O3 scale formation.

Platinum Modified Aluminides-Present Status

1990 ◽  
Author(s):  
J. S. Smith ◽  
D. H. Boone
Keyword(s):  
Gas Turbine ◽  
Gas Phase ◽  
Aluminide Coating ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Diffusion Coatings ◽  
Platinum Aluminide ◽  
Pressure Chemical ◽  
History Of ◽  
Turbine Airfoils

Since their development in the early 1970’s, platinum modified aluminide diffusion coatings have been recognized for their superior oxidation and hot corrosion resistance on nickel based superalloys. More recently, advances in gas phase aluminizing have been utilized to afford coating protection to the internal as well as external surfaces of hollow gas turbine airfoils. This paper presents a brief review of the development history of the platinum aluminide coating system and discusses the various coating morphologies observed. The results of recent work in applying the low pressure chemical vapor deposition process for the production of platinum modified aluminide gas phase coatings on gas turbine components are highlighted.

Reaction couples of ceramic thin films prepared by CVD

1988 ◽  
Vol 46 ◽  
pp. 798-799
Author(s):  
D.W. Susnitzky ◽  
S.R. Summerfelt ◽  
C.B. Carter
Keyword(s):  
Thin Film ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Solid State Reactions ◽  
Spatial Distributions ◽  
Diffusion Couples ◽  
Kinetics Studies ◽  
Ceramic Thin Films ◽  
Initial Stage

Solid-state reactions have traditionally been studied in the form of diffusion couples. This ‘bulk’ approach has been modified, for the specific case of the reaction between NiO and Al2O3, by growing NiAl2O4 (spinel) from electron-transparent Al2O3 TEM foils which had been exposed to NiO vapor at 1415°C. This latter ‘thin-film’ approach has been used to characterize the initial stage of spinel formation and to produce clean phase boundaries since further TEM preparation is not required after the reaction is completed. The present study demonstrates that chemical-vapor deposition (CVD) can be used to deposit NiO particles, with controlled size and spatial distributions, onto Al2O3 TEM specimens. Chemical reactions do not occur during the deposition process, since CVD is a relatively low-temperature technique, and thus the NiO-Al2O3 interface can be characterized. Moreover, a series of annealing treatments can be performed on the same sample which allows both Ni0-NiAl2O4 and NiAl2O4-Al2O3 interfaces to be characterized and which therefore makes this technique amenable to kinetics studies of thin-film reactions.

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