Influence of pores on mechanical properties of plasma sprayed coatings: Case study of YSZ thermal barrier coatings

2018 ◽  
Vol 44 (17) ◽  
pp. 21564-21577 ◽  
Author(s):  
X. Qiao ◽  
Y.M. Wang ◽  
W.X. Weng ◽  
B.L. Liu ◽  
Q. Li
Keyword(s):  
Mechanical Properties ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

New Thermal Barrier Coating System for High Temperature Applications

1998 ◽  
Author(s):  
J. Wilden ◽  
M. Wank ◽  
H.D. Steffens ◽  
M. Brune
Keyword(s):  
Bond Strength ◽  
Thermal Shock ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Hvof Spraying ◽  
Barrier Coatings ◽  
Barrier Coating ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Abstract YPSZ-thermal barrier coatings are widely used in industries. Nevertheies there is secure interest in TBC's for higher temperature application. Ceria or miao-alloyed ceria shows the potential to be used at higher temperatures than YPSZ. Ceria and YPSZ-Ceria-multi-layer thermal barrier coatings were produced by plasma and high velocity oxygen flame (HVOF) spraying. Bond strength and thermal shock behaviour were tested. HVOF sprayed coatings had higher content of oxygen and higher density than plasma sprayed coatings. While plasma sprayed coatings showed microcracks originating in certain phases, HVOF sprayed coatings had cracks perpendicular to the surface across the whole layer thickness. In each case the bond strength was determined by the cohesion inside the ceria coating and not by the bondage between the layers. The thermal shock resistance of each type is limited by different properties of the occuring phases caused by impurities of the used powder. However an excellent bondage between YPSZ and ceria can be achieved. Pure ceria thermal barrier coatings are not suitable due to the high diffusion of oxygen and interaction with the MCr AIY bwid coat.

Mechanical Properties of Thermal Barrier Coatings at Room Temperature

2005 ◽  
Vol 290 ◽  
pp. 336-339 ◽  
Author(s):  
G. Guidoni ◽  
Y. Torres Hernández ◽  
Marc Anglada
Keyword(s):  
Mechanical Properties ◽  
Thermal Barrier Coatings ◽  
Room Temperature ◽  
Inconel 625 ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Bending Tests ◽  
Four Point Bending ◽  
Barrier Coating ◽  
Plasma Sprayed

Four point bending tests have been carried out on a thermal barrier coating (TBC) system, at room temperature. The TBC system consisted of a plasma sprayed Y-TZP top coat with 8 % in weight of Yttria, a bond coat of NiCrAlY and a Ni-based superalloy Inconel 625 as substrate. The TBC coating was deposited on both sides of the prismatic specimens. Efforts have been done in detecting the damage of the coating by means of Maltzbender et al [1] model.

Effect of laser glazing on the thermo-mechanical properties of plasma-sprayed LaTi2Al9O19 thermal barrier coatings

2016 ◽  
Vol 32 (14) ◽  
pp. 1573-1580 ◽  
Author(s):  
S. R. Dhineshkumar ◽  
Muthukannan Duraiselvam ◽  
S. Natarajan ◽  
S. S. Panwar ◽  
Trilochan Jana ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Laser Glazing ◽  
Barrier Coatings ◽  
Plasma Sprayed

Microstructural Evolution and Mechanical Properties of Vertical-Cracked Thermal Barrier Coatings in Thermal Exposure

2012 ◽  
Vol 512-515 ◽  
pp. 1040-1044 ◽  
Author(s):  
Zhe Lu ◽  
Sang Won Myoung ◽  
Tae Sik Jang ◽  
Kang Hyeon Lee ◽  
Je Hyun Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Barrier Coatings ◽  
Total Porosity ◽  
Thermal Exposure ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Plasma Sprayed ◽  
Intrinsic Feature

The effects of intrinsic feature of feedstock in air plasma-sprayed (APS) coatings on the microstructure and mechanical properties of vertical-cracked thermal barrier coatings (TBCs) were investigated in thermal exposure. The microstructure after the thermal exposure for 400 h is densified, while after the thermal exposure for 800 h various defects such as interlamellar cracks and the vertical and horizontal cracks are newly developed, even though the total porosity is decreased. The microstructure of the TBC prepared with 204 C-NS is more porous than that of the TBC with 204NS, showing higher mechanical properties and better thermal stability in the TBC with 204 NS.

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