On the Reproducibility of Air Plasma Spray Process and Control of Particle State

2006 ◽  
Vol 15 (4) ◽  
pp. 739-743 ◽  
Author(s):  
V. Srinivasan ◽  
A. Vaidya ◽  
T. Streibl ◽  
M. Friis ◽  
S. Sampath
Keyword(s):  
Plasma Spray ◽  
Particle State ◽  
Air Plasma Spray ◽  
Air Plasma ◽  
Spray Process ◽  
Plasma Spray Process ◽  
And Control

scholarly journals Fabrication of samarium strontium aluminate ceramic and deposition of thermal barrier coatings by air plasma spray process

2018 ◽  
Vol 144 ◽  
pp. 02001 ◽  
Author(s):  
T Baskaran ◽  
Shashi Bhushan Arya
Keyword(s):  
Thermal Barrier Coatings ◽  
Plasma Spray ◽  
Thermal Barrier ◽  
Air Plasma Spray ◽  
Air Plasma ◽  
Strontium Aluminate ◽  
Barrier Coatings ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Thermo Physical Properties

Thermal barrier coatings (TBC) with the metallic NiCrAlY bond coat are often used in many aircraft engines to protect superalloy components from high-temperature corrosion thereby to improve the life of gas turbine components. The search for new TBC material has been intensified in recent years due to lack of thermo-physical properties of conventionally used Yttria stabilized Zirconia (YSZ) TBCs. Recently, the rare earth containing Samarium Strontium Aluminate (SSA) based ceramic was proposed as a new TBC material due to its matching thermo-physical properties with the substrate. The present work focused on the synthesis of SSA ceramics for TBCs application and its coatings development on Ni-based superalloy Inconel 718 substrate by air plasma spray process. The X-ray photoelectron spectroscopy (XPS) result confirmed the formation of single phase SSA ceramic after synthesis. The surface morphology of SSA TBCs is mainly composed of melted splats, semi and un-melted particles. The cross-sectional SEM micrographs did not show any spallation at the interface which indicated good mechanical interlocking between the bond coat and ceramic top coat. The Young’s modulus and hardness of SSA TBCs were found to be 80 and 6.1 GPa, respectively. The load-depth curve of SSA TBC showed good elastic recovery about 47 %.

Development of Corrosion Resistance Coating for AISI 410 Grade Steel

2015 ◽  
Vol 813-814 ◽  
pp. 135-139 ◽  
Author(s):  
K.G. Girisha ◽  
R. Rakesh ◽  
C. Durga Prasad ◽  
K.V. Sreenivas Rao
Keyword(s):  
Corrosion Resistance ◽  
Plasma Spray ◽  
Corrosion Behaviour ◽  
Steel Substrate ◽  
Salt Spray ◽  
Research Work ◽  
Optical Microscope ◽  
Air Plasma ◽  
Spray Process ◽  
Plasma Spray Process

In this present research work, corrosion behaviour of grit blasted AISI 410 steel substrate coated with NiCr/Al2O3,NiCr/ZrO2 particles was investigated using salt spray test as per ASTM B117. Coatings were prepared using air Plasma spray process. Nickel chromium was used as bond coat for obtaining good fastening between the base metal and coated particles. The microstructures of the coated and un-coated specimens were characterized using scanning electron microscope and optical microscope. Distribution coated particle was found uniform throughout the steel substrate was revealed from SEM microphotographs. The obtained results shows significant improvement in corrosion resistance and micro hardness for NiCr/Al2O3 and NiCr/ZrO2 coating deposited on steel by plasma spray process than the as sprayed base steel substrates.

Intelligent system for prediction and control: Application in plasma spray process

2011 ◽  
Vol 38 (1) ◽  
pp. 260-271 ◽  
Author(s):  
A.-F. Kanta ◽  
G. Montavon ◽  
C.C. Berndt ◽  
M.-P. Planche ◽  
C. Coddet
Keyword(s):  
Plasma Spray ◽  
Intelligent System ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Prediction And Control ◽  
Control Application ◽  
And Control

Study on the Long-Term Stability of Plasma Spraying

2000 ◽  
Author(s):  
L. Leblanc ◽  
C. Moreau
Keyword(s):  
Plasma Spraying ◽  
Plasma Spray ◽  
Particle State ◽  
Spray Process ◽  
Long Term Stability ◽  
Plasma Spray Process ◽  
Long Term Experiment ◽  
The Stability ◽  
Sprayed Coatings

Abstract The damaging of the electrodes during spraying can affect the reproducibility of the plasma spray process. Indeed, this may influence the plasma characteristics and the energy transfer to the sprayed particles resulting in significant changes in the coating attributes. In this paper, results from a detailed investigation on the stability of plasma spraying are presented. Specifically designed diagnosis tools were used to study the evolution of key parameters of a plasma spray process during a long-term experiment. A comprehensive analysis is carried out on the collected set of data, with an emphasis on the correlation that may exist among them. Results show significant variations in the particle state and gun characteristics with the spraying time. These variations are reflected in the microstructure of the sprayed coatings. The investigation also gives some indication on how the spray process could be controlled.

The Solution Precursor Plasma Spray Process for Making Durable Thermal Barrier Coatings

2005 ◽  
Author(s):  
Maurice Gell ◽  
Fang Wu ◽  
Eric H. Jordan ◽  
Nitin P. Padture ◽  
Baki M. Cetegen ◽  
...  
Keyword(s):  
Plasma Spray ◽  
Plasma Plume ◽  
Thermal Barrier ◽  
Solution Precursor Plasma Spray ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Barrier Coating ◽  
Solution Precursor ◽  
And Control ◽  
Thick Coatings

The Solution Precursor Plasma Spray (SPPS) process involves the injection of atomized droplets of precursor into the plasma plume, instead of powder that is used in conventional plasma spray. The resultant thermal barrier coating (TBC) microstructure consists of (1) through-coating-thickness cracks, (2) ultra-fine splats, and (3) nanometer and micrometer-sized dispersed pores. These unique SPPS microstructural features provide highly durable TBCs. The SPPS TBCs in 1121°C /1 hour cyclic furnace tests exhibit a significantly improved spallation life compared to APS, DVC, and EB-PVD/Pt-Al TBCs. Extensive process diagnostic and modeling studies have been conducted to provide a foundation for understanding and control of the process. Process/microstructure/property relationships have been defined. Extension of the process for making thick coatings (> 3mm) and low thermal conductivity coatings are described.

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