Deformation of Plasma Sprayed Thermal Barrier Coatings

2000 ◽  
Vol 122 (3) ◽  
pp. 387-392 ◽  
Author(s):  
Ufuk Senturk ◽  
Rogerio S. Lima ◽  
Carlos R. C. Lima ◽  
Christopher C. Berndt
Keyword(s):  
Acoustic Emission ◽  
Bond Coat ◽  
Composite System ◽  
Coating Properties ◽  
Failure Characteristics ◽  
Deformation Curves ◽  
Point Bend ◽  
Plasma Sprayed ◽  
Thermally Sprayed

The deformation behavior of thermally sprayed partially stabilized zirconia (PSZ) coatings are investigated using Hertzian indentation and four-point bend testing, with in situ acoustic emission monitoring. The experimental deformation curves, together with the corresponding acoustic emission responses and the fracture properties of the material are used in defining the deformation characteristics of the coating (ceramic overlay with metallic bond coat where applicable) and substrate composite system. Experiments are aimed in examining the influence of the bond coat and the coating properties on the form of deformation. Substrate temperature and pauses during spraying are demonstrated to strongly effect the coating properties and the resulting fracture/failure characteristics of the composite system. [S0742-4795(00)02503-5]

scholarly journals Deformation of Plasma Sprayed Thermal Barrier Coatings

1999 ◽  
Author(s):  
Ufuk Senturk ◽  
Rogerio S. Lima ◽  
Carlos R. C. Lima ◽  
Christopher C. Berndt
Keyword(s):  
Acoustic Emission ◽  
Composite System ◽  
Coating Properties ◽  
Failure Characteristics ◽  
Deformation Curves ◽  
Metallic Bond ◽  
Point Bend ◽  
Plasma Sprayed ◽  
Thermally Sprayed

The deformation behavior of thermally sprayed partially stabilized zirconia (PSZ) coatings are investigated using Hertzian indentation and four-point bend testing, with in situ acoustic emission monitoring. The experimental deformation curves, together with the corresponding acoustic emission responses and the fracture properties of the material are used in defining the deformation characteristics of the coating (ceramic overlay with metallic bond coal where applicable) and substrate composite system. Experiments are aimed in examining the influence of the bond coat and the coating properties on the form of deformation. Substrate temperature and pauses during spraying are demonstrated to strongly effect the coating properties and the resulting fracture/failure characteristics of the composite system.

scholarly journals Micron-Scale Deformation: A Coupled In Situ Study of Strain Bursts and Acoustic Emission

2017 ◽  
Vol 23 (6) ◽  
pp. 1076-1081 ◽  
Author(s):  
Ádám István Hegyi ◽  
Péter Dusán Ispánovity ◽  
Michal Knapek ◽  
Dániel Tüzes ◽  
Kristián Máthis ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Acoustic Emission ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Data Sampling ◽  
Deformation Curves ◽  
High Data ◽  
Excellent Control ◽  
As Stress

AbstractPlastic deformation of micron-scale crystalline materials differs considerably from bulk samples as it is characterized by stochastic strain bursts. To obtain a detailed picture of the intermittent deformation phenomena, numerous micron-sized specimens must be fabricated and tested. An improved focused ion beam fabrication method is proposed to prepare non-tapered micropillars with excellent control over their shape. Moreover, the fabrication time is less compared with other methods. The in situ compression device developed in our laboratory allows high-accuracy sample positioning and force/displacement measurements with high data sampling rates. The collective avalanche-like motion of the dislocations is observed as stress decreases on the stress–strain curves. An acoustic emission (AE) technique was employed for the first time to study the deformation behavior of micropillars. The AE technique provides important additional in situ information about the underlying processes during plastic deformation and is especially sensitive to the collective avalanche-like motion of the dislocations observed as the stress decreases on the deformation curves.

Electrical Properties of Half Heusler Coatings Depending on Spray Process

2021 ◽  
Author(s):  
Geoffrey Darut ◽  
Axel Portebois ◽  
Ludovic Vitu ◽  
Marie Pierre Planche ◽  
Hanlin Liao ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Electrical Properties ◽  
Practical Interest ◽  
Coating Properties ◽  
Spray Process ◽  
Coating Composition ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
P Type ◽  
Thermally Sprayed

Abstract Microstructure and physicochemical properties of a thermally sprayed coating depend on the dynamics of the particles interacting with the spray jet. This is especially the case for electrical properties. In this study, different spraying processes were used to spray p-type and n-type half-Heusler powders. Thermoelectric powders, Hf20Zr75Ti05CoSb80Sn20 (p-type) and Hf60Zr40NiSn98Sb02 (n-type), were selected due to their interesting electrical properties. The spray processes were evaluated based on coating composition and mechanical property measurements. The only coatings of practical interest were those that were plasma sprayed and they were examined in detail to assess the effect of process parameters on coating properties.

Investigation Of Cracking Mechanisms Of Plasma Sprayed Alumina-13% Titania By Acoustic Emission

1995 ◽  
Vol 409 ◽  
Author(s):  
C.K. Lin ◽  
S.H. Leigh ◽  
R.V. Gansert ◽  
K. Murakami ◽  
S. Sampath ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
High Amplitude ◽  
High Energy ◽  
Physical Models ◽  
Free Standing ◽  
Water Stabilized Plasma ◽  
Heat Treated ◽  
Cracking Mechanisms ◽  
Point Bend ◽  
Plasma Sprayed

AbstractFree standing alumina-13% titania samples were manufactured using high power water stabilized plasma spraying. Heat treatment was performed at 1450°C for 24 hours and then at 1100°C for another 24 hours. Four point bend tests were performed on the as-sprayed and heat-treated samples in both cross section and in-plane orientations with in situ acoustic emission monitoring to monitor the cracking during the tests. Catastrophic failure with less evidence of microcracking was observed for as-sprayed samples. Energy and amplitude distributions were examined to discriminated micro- and macro-cracks. It was found that the high energy (> 100) and high amplitude (say > 60 dB) responses can be characterized as macro-cracks. Physical models are proposed to interpret the AE responses under different test conditions so that the cracking mechanisms can be better understood.

In Situ Measurement Within Plasma-Sprayed Zirconia Coatings Under Industrial Conditions

1998 ◽  
Author(s):  
N. Baradel ◽  
L. Bianchi ◽  
F. Blein ◽  
A. Freslon ◽  
M. Jeandin
Keyword(s):  
Thermal Stresses ◽  
Cooling System ◽  
Deposition Process ◽  
Thermomechanical Properties ◽  
Stress Generation ◽  
Plasma Gun ◽  
Damage Level ◽  
Point Bend ◽  
Plasma Sprayed

Abstract The thermomechanical properties of plasma-sprayed deposits strongly depend on residual stress distribution. This latter is mainly attributed to the relative torch/substrate velocity as well as to the cooling system location and efficiency. The determining of both quenching and thermal stresses, which are generated respectively during spraying stage and cooling stage, is then required to improve coatings quality. A rather simple apparatus, which consists in monitoring the curvature of a beam substrate during the whole deposition process, has been developed to work under industrial conditions. It has been applied to partially stabilized zirconia coatings performed onto stainless steel and cast iron substrates. Spraying temperature and plasma gun velocity have been selected as relevant parameters for this study about stress generation and mechanical release. Finally, four point bend tests have been performed on deposited samples to measure coating mechanical properties and to evaluate damage level.

In-situ acoustic emission monitoring during electron microscopy of a model composite system

1992 ◽  
Vol 13 (2) ◽  
pp. 108-120 ◽  
Author(s):  
A. Siegmann ◽  
R. G. Kander
Keyword(s):  
Electron Microscopy ◽  
Acoustic Emission ◽  
Composite System ◽  
Model Composite ◽  
Acoustic Emission Monitoring ◽  
Emission Monitoring

Effect of Suspension Plasma-Sprayed YSZ Columnar Microstructure and Bond Coat Surface Preparation on Thermal Barrier Coating Properties

2017 ◽  
Vol 26 (6) ◽  
pp. 1025-1037 ◽  
Author(s):  
Benjamin Bernard ◽  
Aurélie Quet ◽  
Luc Bianchi ◽  
Vincent Schick ◽  
Aurélien Joulia ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Bond Coat ◽  
Surface Preparation ◽  
Thermal Barrier ◽  
Coating Properties ◽  
Columnar Microstructure ◽  
Barrier Coating ◽  
Plasma Sprayed

Experimental Approach to Adhesion between an Alumina Plasma-Sprayed Coating and Polymeric Substrate

1996 ◽  
Author(s):  
P. Lucchese ◽  
R. Jeandin ◽  
G. Surdon ◽  
A. Delavernme
Keyword(s):  
Bond Coat ◽  
Surface Preparation ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Fiber Layer ◽  
Bond Coats ◽  
Reinforced Polymer ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Thermally Sprayed

Abstract Thermal spray coating of fiber reinforced polymer (FRP) components has a high development potential to improve their wear, erosion and corrosion resistance. This paper deals with the optimization of plasma spraying conditions of alumina onto a FRP substrate, including the study of surface preparation. The so-called "Atmosphere and Temperature Controlled Process (ATC, patented by CEA)" was used to maintain the substrate temperature at a rather low level, i.e. near room temperature. Various surface preparation processes such as grit blasting, cleaning using the plasma torch and pre-coating with an intermediate bond coat were tested. The latter was shown to improve adhesion between the coating and the substrate significantly, when using 2 types of bond coats. One consisted of an additionnal fiber layer directly stuck to the substrate, the other of an intermediate thermally-sprayed PEEK layer. Results of adhesion tests were discussed in the light of interface characterization. Using a PEEK bond coat led to an adhesion strength between alumina and the substrate 3 times better than that for the material without any bond coat.

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