A STUDY ON THE EFFECT OF HIGH HEAT FLUX ON MICROSTRUCTURE AND RESPONSE OF FUNCTIONALLY GRADED THERMAL BARRIER COATINGS

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SALEHI M.; MEHMANNAVAZ H.; KARBASIAN GH.R.; RAHMANI M.

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Journal: JOURNAL OF NEW MATERIALS Year:2015 | Volume:5 | Issue:4 (20) Page(s): 115-128

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Title

A STUDY ON THE EFFECT OF HIGH HEAT FLUX ON MICROSTRUCTURE AND RESPONSE OF FUNCTIONALLY GRADED THERMAL BARRIER COATINGS

Author(s)

SALEHI M. | MEHMANNAVAZ H. | KARBASIAN GH.R. | RAHMANI M. | Issue Writer Certificate

Keywords

THERMAL BARRIER COATINGSQ2

FUNCTIONALLY GRADED MATERIALS (FGMS)Q2

NICRALY-YSZQ2

HEAT FLUXQ2

OXIDATIONQ1

Abstract

High HEAT FLUX exposes of convergent - divergent nozzle may lead to melt the internal wall, thereby the performance of the nozzle have deteriorated significantly. In order to solve this problem, in this study, functionally graded Yttria Stabilized Zirconia (YSZ)/NiCrAlY coating was deposited on the internal wall using air plasma spray technique. Coated and uncoated specimens were subjected to high HEAT FLUX acetylene-oxygen combustion flame and were then characterized by optical microscope, Scanning Electron Microscopy (SEM) and microhardness test. SEM observation into the functionally graded layers showed that selective OXIDATION occurred during atmosphericplasma spray of the YSZ-NiCrAIY. Mixing these oxides with zirconia at molten state produced ceramic composites regions, which contain undissolved zirconia granules embedded in the liquid matrix of zirconia + the oxides. It was observed that the bare sample melted during high HEAT FLUX beating. For the coated specimen, it was found that the test causes changes in the coating, leading to a denser microstructure and development of cracks in the YSZ top coat, even though no visible differences in appearance between the exposed and unexposed coated samples were observed.

Cites

SYNTHESIS OF ZIRCONIUM DIBORIDE VIA CARBOTHERMAL, BOROTHERMAL, AND BOROCARBOTHERMAL ACTIVATION METHODS

References

CO-DEPOSITION OF HA/TI02 OVER ELECTROLYTIC PLASMA NITROCARBURISED 316L STAINLESS STEEL AND STUDY OF CORROSION BEHAVIOR OF TREATED STEEL

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APA: Copy

SALEHI, M., MEHMANNAVAZ, H., KARBASIAN, GH.R., & RAHMANI, M.. (2015). A STUDY ON THE EFFECT OF HIGH HEAT FLUX ON MICROSTRUCTURE AND RESPONSE OF FUNCTIONALLY GRADED THERMAL BARRIER COATINGS. JOURNAL OF NEW MATERIALS, 5(4 (20)), 115-128. SID. https://sid.ir/paper/170000/en

Vancouver: Copy

SALEHI M., MEHMANNAVAZ H., KARBASIAN GH.R., RAHMANI M.. A STUDY ON THE EFFECT OF HIGH HEAT FLUX ON MICROSTRUCTURE AND RESPONSE OF FUNCTIONALLY GRADED THERMAL BARRIER COATINGS. JOURNAL OF NEW MATERIALS[Internet]. 2015;5(4 (20)):115-128. Available from: https://sid.ir/paper/170000/en

IEEE: Copy

M. SALEHI, H. MEHMANNAVAZ, GH.R. KARBASIAN, and M. RAHMANI, “A STUDY ON THE EFFECT OF HIGH HEAT FLUX ON MICROSTRUCTURE AND RESPONSE OF FUNCTIONALLY GRADED THERMAL BARRIER COATINGS,” JOURNAL OF NEW MATERIALS, vol. 5, no. 4 (20), pp. 115–128, 2015, [Online]. Available: https://sid.ir/paper/170000/en

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