Microstructure, thermal shock resistance and thermal emissivity of plasma sprayed LaMAl11O19 (M=Mg, Fe) coatings for metallic thermal protection systems

2013 ◽  
Vol 271 ◽  
pp. 52-59 ◽  
Author(s):  
Hong-Zhi Liu ◽  
Jia-Hu Ouyang ◽  
Zhan-Guo Liu ◽  
Ya-Ming Wang
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Thermal Protection ◽  
Thermal Protection Systems ◽  
Thermal Emissivity ◽  
Protection Systems ◽  
Shock Resistance ◽  
Plasma Sprayed

Thermal Shock Resistance of Plasma Sprayed Multi-Layered Functionally Graded Cr3C2-NiCr Coatings

2016 ◽  
Vol 852 ◽  
pp. 1000-1005 ◽  
Author(s):  
Dong Xing Fu ◽  
Jing Na Liu ◽  
Er Bao Liu ◽  
Zhao Bin Cai ◽  
Xiu Fang Cui ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Functionally Graded ◽  
X Ray Diffraction ◽  
Coating Materials ◽  
Heating And Cooling ◽  
Structure Of Coatings ◽  
Functionally Graded Coatings ◽  
Shock Resistance ◽  
Plasma Sprayed

The interface properties of multi-layered functionally graded Cr3C2-NiCr coatings deposited by plasma spraying technique were experimentally studied in this paper. The microstructure and phase structure of coatings were studied with scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The thermal shock resistance was investigated by cyclic heating and cooling tests using an electro-calefaction furnace. The crack appearances of the coatings were observed carefully. Results show that the plasma sprayed multi-layered functionally graded coatings are compact and the adhesion between the layers and the substrate is good. The coatings have better macro-hardness than the substrate, and the 6-layers coating has the highest macro-hardness and the best wear resistance. Besides, the micro-hardness of coatings increases with increasing content of Cr2C3 in coating materials. Results of cyclic thermal shock show that the main failure styles of the coatings are crack and desquamation and the thermal shock resistance of the coatings is improved obviously by increasing the number of coating layers.

Improving Thermal Shock Resistance of Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings by Laser Remelting

2012 ◽  
Vol 472-475 ◽  
pp. 2502-2507
Author(s):  
Zong Yin Duan ◽  
Dong Sheng Wang
Keyword(s):  
Thermal Shock ◽  
Thermal Barrier Coatings ◽  
Thermal Shock Resistance ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Laser Remelting ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Shock Resistance ◽  
Plasma Sprayed

This paper deals with the microstructure and thermal shock behavior of laser remelting of yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) deposited by plasma spraying. The microstructures of the coatings were analyzed by scanning electron microscopy (SEM). It was found that the as-sprayed ceramic coating had laminated structure with high porosity. However, the coating exhibited a dense lamellar-like layer with segment cracks on the remained plasma-sprayed porous layer. Thermal shock experiments for the two kinds of TBCs were performed by water quenching method. Testing result showed that the laser-remelted TBC had better thermal shock resistance than the as-sprayed one. The damage mode of the as-sprayed TBC was great-size whole spalling. In contract, the failure mechanism of the laser-remelted one was mainly local pelling. Segmented cracks of the top ceramic coatings caused by laser remelting improved the stress accommodation and were mainly attributed to the enhancement for thermal shock life of TBC.

Thermal Expansion Properties of Plasma-Sprayed Thick Coatings

1998 ◽  
Author(s):  
Y.-K. Lee ◽  
H.-J. Kim ◽  
R.-W. Chang
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Powder Size ◽  
Thermal Expansion Coefficients ◽  
Shock Resistance ◽  
Expansion Coefficients ◽  
Plasma Sprayed ◽  
Thick Coatings

Abstract The thermal expansion characteristics of plasmasprayed coatings were investigated. The thermal expansion measurements were carried out up to 1200°C on thick coatings that were substrate free. The effects on the thermal expansion coefficients were studied in terms of composition, powder size, porosity, and the phase transformation. The relationships between the thermal shock resistance and the thermal expansion properties of the coatings are also discussed.

scholarly journals Numerical Simulation for Thermal Shock Resistance of Thermal Protection Materials Considering Different Operating Environments

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Weiguo Li ◽  
Dingyu Li ◽  
Ruzhuan Wang ◽  
Daining Fang
Keyword(s):  
Numerical Simulation ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Thermal Protection ◽  
Thermal Environment ◽  
Full Account ◽  
Thermal Environments ◽  
Operation Conditions ◽  
Operating Environments ◽  
Shock Resistance

Based on the sensitivities of material properties to temperature and the complexity of service environment of thermal protection system on the spacecraft, ultrahigh-temperature ceramics (UHTCs), which are used as thermal protection materials, cannot simply consider thermal shock resistance (TSR) of the material its own but need to take the external constraint conditions and the thermal environment into full account. With the thermal shock numerical simulation on hafnium diboride (HfB2), a detailed study of the effects of the different external constraints and thermal environments on the TSR of UHTCs had been made. The influences of different initial temperatures, constraint strengths, and temperature change rates on the TSR of UHTCs are discussed. This study can provide a more intuitively visual understanding of the evolution of the TSR of UHTCs during actual operation conditions.

Microstructures, Thermal Shock Resistance and Isothermal Oxidation Resistance of Nanostructured Ceria Stabilized Zirconia Coatings

2011 ◽  
Vol 189-193 ◽  
pp. 160-164
Author(s):  
Wen Quan Wang ◽  
Wen Biao Gong ◽  
Da Qian Sun
Keyword(s):  
Thermal Shock ◽  
Oxidation Resistance ◽  
Thermal Shock Resistance ◽  
Isothermal Oxidation ◽  
Stabilized Zirconia ◽  
Grain Structures ◽  
Nanostructured Ceria ◽  
Shock Resistance ◽  
Columnar Grain ◽  
Plasma Sprayed

Microstructures, thermal shock resistance and isothermal oxidation resistance of plasma-sprayed nanostructured ceria stabilized zirconia (CSZ) coatings were investigated. The results revealed that the nanostructured CSZ coatings mainly included two kinds of typical microstructures, nanosized CSZ particles embedded in the so-called matrix and micrometer-sized columnar grain structures of CSZ similar to those of the conventional coatings. Compared with the conventional CSZ coatings, the nanostructured CSZ coatings were denser and had finer and fewer porous structures and microcracks. Further study showed that the nanostructured CSZ coatings had higher thermal shock resistance and isothermal oxidation resistance compared with conventional CSZ coatings. The improved properties of the nanostructured CSZ coatings were attributed to the better coating toughness and decreased porosities and microcracks in the coatings.

scholarly journals Study of Thermal Shock Resistance of Plasma Sprayed VW75 Alloy

2021 ◽  
Vol 1948 (1) ◽  
pp. 012187
Author(s):  
Bingtao Lin ◽  
Minglong Ma ◽  
Kui Zhang ◽  
Yongjun Li ◽  
Zehua Chen ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Shock Resistance ◽  
Plasma Sprayed
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