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.

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 Behavior of LPPS MCrAlY Coatings at High Temperature: Part I TGO Growth and β Phase Depletion

2021 ◽  
Vol 1035 ◽  
pp. 539-544
Author(s):  
Zhao Ran Zheng ◽  
Kang Yuan
Keyword(s):  
High Temperature ◽  
Early Stage ◽  
Oxidation Kinetic ◽  
Thermally Grown Oxide ◽  
Temperature Oxidation ◽  
Β Phase ◽  
Mcraly Coating ◽  
Mcraly Coatings ◽  
Diffusion Controlled ◽  
Tgo Growth

MCrAlY can be used as bond coats for thermal barrier coatings (TBCs) with good ductility and excellent resistance against high temperature oxidation and hot corrosion. The behavior of the thermally grown oxide (TGO) scale formed at the MCrAlY coatings plays a key role on the oxidation resistance. In this paper, the oxidation kinetic curves of a MCrAlY coating at 900~1000 °C were obtained by measuring the thickness of the TGO scales. The curves basically conveyed parabolic laws, indicating a diffusion-controlled mechanism of the TGO growth. The thickness of TGO was positively correlated with the consumption of β phase during the early stage of the oxidation processes. After about the half-life of the β phase consumption, the depletion of the β phase significantly accelerated, which was caused by coating-substrate interdiffusion. In addition, the microstructure of the TGO was analyzed

A Comparison of HVOF and LPPS Applied MCrAlY Coating

1996 ◽  
Author(s):  
Hans van Esch ◽  
Wayne Greaves
Keyword(s):  
Plasma Spray ◽  
High Velocity ◽  
Hybrid Coatings ◽  
Porosity Level ◽  
Optimum Parameters ◽  
Mcraly Coating ◽  
Mcraly Coatings ◽  
Low Pressure Plasma Spray ◽  
Low Pressure Plasma ◽  
Static Oxidation

This study examined the ability of two High Velocity Oxyfuel (HVOF) systems, the Hobart Tafa JP 5000 and the Sulzer Metco DJ 2600 Hybrid, to apply MCrAlY coatings. The results were compared to a Low Pressure Plasma Spray (LPPS) applied material of the same chemistry. Each system is described and the optimum parameters are given. Also, an analysis of the powders is included. The results were metallurgically evaluated for porosity level, oxygen content and yttrium distribution. Static oxidation tests were also performed on the NiCoCrAlY coating applied by each system. Conclusions were based on the relative performance of the JP 5000 and DJ 2600 Hybrid coatings as compared to the LPPS baseline material.

Development, Characterization and Testing of MCrAlY HVOF Coating Used as Bond Coat for YPSZ Top Coat

2008 ◽  
Author(s):  
Andrea Scrivani ◽  
Alessandro Lanzi ◽  
Carlo Giolli ◽  
Gabriele Rizzi ◽  
Dario Russo ◽  
...  
Keyword(s):  
Plasma Spray ◽  
Bond Coat ◽  
Fatigue Testing ◽  
State Of The Art ◽  
Deposition Process ◽  
The State ◽  
Vacuum Plasma Spray ◽  
Mcraly Coating ◽  
Mcraly Coatings ◽  
Barrier Coating

MCrAlY coatings (where M stands for Co, Ni, or CoNi) are used as a single overlay coating or as bond coat for thermal barrier coating (TBC) systems. Low Pressure Plasma Spray (LPPS) or Vacuum Plasma Spray (VPS) MCrAlY coatings are considered nowadays the state of the art, nevertheless High Velocity Oxygen Fuel (HVOF) MCrAlY coating is gaining more and more importance due to its quality and to the possible cost reduction in comparison to the state of the art LPPS/VPS coatings. On the other hand the HVOF process tends to have a relatively low surface roughness, which hinders the possibility to act as bond coat for a TBC coating layer. In this work, a HVOF deposition process was developed to obtain a rough MCrAlY coating which can be used as bond coat for yttria partially stabilized zirconia (YPSZ) top coat. Developed parameters were used to apply a TBC system on a stage 2 blade. TBC sections on the same blade have successfully passed thermal fatigue testing according to the specification of an important OEM.

Surface Oxidation Behaviour of Cubic BN Powders

2014 ◽  
Vol 602-603 ◽  
pp. 544-547
Author(s):  
Xin Yan Yue ◽  
Yue Zhang ◽  
Jian Jun Wang ◽  
Wei Wang ◽  
Hong Qiang Ru
Keyword(s):  
Heat Treatment ◽  
Surface Oxidation ◽  
Mass Gain ◽  
Oxidation Behaviour ◽  
Experimental Results ◽  
Oxidation Temperature ◽  
Oxidation Reactions ◽  
Oxidation Treatment ◽  
Treatment Processes

In order to improve the sinterability of the cBN, surface oxidation treatment was conducted to form a B2O3 film on the surface of the cBN powders. The cBN powders (d50 = 7.5 μm) were used as original powders. The heat treatment processes were 500, 800, 900, 950, 980 and 1000 °C holding for 30 minutes, respectively. The oxidation reactions which probably happened were calculated based on the thermodynamics. The experimental results showed that the oxidation starting temperature of cBN powders was higher than 800 °C. The higher the oxidation temperature, the greater the mass gain of the cBN powders.

Effect of surface condition on the oxidation behaviour of MCrAlY coatings

2006 ◽  
Vol 201 (7) ◽  
pp. 3824-3828 ◽  
Author(s):  
A. Gil ◽  
V. Shemet ◽  
R. Vassen ◽  
M. Subanovic ◽  
J. Toscano ◽  
...  
Keyword(s):  
Surface Condition ◽  
Oxidation Behaviour ◽  
Mcraly Coatings ◽  
Effect Of Surface

Characterisations of Cu-Based Coated Al7075 via Plasma-Spray Technique

2011 ◽  
Vol 462-463 ◽  
pp. 313-318
Author(s):  
Mariyam Jameelah Ghazali ◽  
S.E. Mat Kamal ◽  
Shahrum Abdullah
Keyword(s):  
Plasma Spray ◽  
Surface Preparation ◽  
Power Input ◽  
Substrate Material ◽  
Coating Material ◽  
Fractional Factorial ◽  
Substrate Roughness ◽  
Optimum Parameters ◽  
Spray Technique ◽  
Al 7075

This work aims to characterise a Cu-based coating material on Al-7075 by using a plasma-spray technique in order to enhance the surface properties of components for automotive applications. Plasma-spray is a process for formation coating on substrates whereby a feedstock is rapidly heated to a molten or near-molten state, and a gas are use to propel the material toward suitably prepared substrate. The most prominent advantages of this method are virtually any coating material can be used and any substrate material can be coated with low thermal stress on substrate parts and high deposition rates [1]. The coating characteristic can be controlled by varying the process variables such as input powers, material feed rates, gas pressures, surface preparation of the substrate and spray distance [2]. The effect of crucial parameters like the electric power input to plasma, spray rate and substrate roughness were studied. The experiments of spraying were design using a 23 fractional factorial plan. The plan allows studying the effect of each factor on the response variables, as well as the effect of interactions between factors on the response variable at the least number of experiment runs. The coating layers have been characterised with respect to the structure by using a scanning electron microscopy (SEM). The result indicates that sprayed particles cool and built up into pancake-like shapes splat, characteristic a plasma spray electric process products. It was found that the optimum parameters were obtained at a power of 24.6 kW, with a powder feed rate of 1 rpm and substrate roughness of 0.5µm.

170 Ingredient change of plasma spray coating and structure alteration by heat treatment

2015 ◽  
Vol 2015.64 (0) ◽  
pp. _170-1_-_170-2_
Author(s):  
Toshiyuki Saito ◽  
Takumi Mio ◽  
Miwa Hokii ◽  
Mototake Furuhashi
Keyword(s):  
Heat Treatment ◽  
Plasma Spray ◽  
Spray Coating ◽  
Plasma Spray Coating
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