Thermal-shock resistance of LnMgAl11O19 (Ln=La, Nd, Sm, Gd) with magnetoplumbite structure

Zhang, Jiangfeng; Zhong, Xinghua; Cheng, Yongliang; Wang, Ying; Xu, Zhenhua; Chen, Xiaolong; Ma, Hongmei; Zhao, Yu; Cao, Xia

doi:10.1016/j.jallcom.2009.04.025

Cited by 27 publications

(4 citation statements)

References 27 publications

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“…The tendency that the cell parameters (both a and c) gradually decrease from LaMA to GdMA has been proved in Kahn's work 19 and our former work. 27 As a result, it could be concluded that the attachment energy of the (0 0 0 1) face gradually increases from LaMA to GdMA due to the change tendency of bond energies, and then the growth rate of (0 0 0 1) face increases with the reduction of RE 3+ radius, thus the larger the RE 3+ radius, the thinner the final average grain thickness for such RE hexaluminate coatings after thermal cycling failure as illustrated in Fig. 9.…”

Section: Comparison Of the Thermal Cycling Behaviors Of Four Coatingsmentioning

confidence: 90%

“…16,17 In our former work, the failure of LaMA coating and the thermal shock resistance of REMgAl 11 O 19 (RE = La, Nd, Sm, Gd) bulk materials were studied. 27,28 As a continuing work, coatings of REMgAl 11 O 19 (RE = Nd, Sm, Gd) and SrAl 12 O 19 with magnetoplumbite structure are prepared by plasma spraying and their thermal cycling behaviors are investigated in the present study.…”

Section: Introductionmentioning

confidence: 99%

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Thermal cycling behaviors of the plasma sprayed thermal barrier coatings of hexaluminates with magnetoplumbite structure

Chen

Zhang

Zhong

et al. 2010

Journal of the European Ceramic Society

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Section: Comparison Of the Thermal Cycling Behaviors Of Four Coatingsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Thermal cycling behaviors of the plasma sprayed thermal barrier coatings of hexaluminates with magnetoplumbite structure

Chen

Zhang

Zhong

et al. 2010

Journal of the European Ceramic Society

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“…LHA has platelets morphology and forms porous interlocking structure. The effect of rare earths on the magnetoplumbite structure has been investigated by the several researchers but the platelet morphology is retained in all the cases [7][8]. The sintering of grains with platelet morphology faces several difficulties.…”

Section: Introductionmentioning

confidence: 99%

Sintering and Microstructural Modification of Seeded and Neodymium Doped Lanthanum Hexaaluminate

Jana

Jayan²,

Mandal³

et al. 2016

MSF

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The effect of (i) heterogeneous nucleation by seeding or (ii) doping with neodymium on the formation of lanthanum hexaaluminate was studied during sol to gel conversion. The resultant dried gels were calcined at various temperatures starting from 1100°C to 1600°C for 2 h to study the phase evolution and microstructure.The combined effects of advanced sol gel processing and heterogeneous nucleation promoted the formation of lanthanum hexaaluminate phase at lower temperature (1200°C) than the conventional routes (1300°C). Lanthanum hexaaluminate phase was detected at 1200°C and 1300°C in seeded gel (SG) and unseeded gel (UG), respectively. Heterogeneous nucleation of SG decreases the temperature of formation of lanthanum hexaaluminate by 100°C. Single phase lanthanum hexaaluminate was formed at 1600°C in seeded gel whereas trace of lanthanum monoaluminate phase was still present in UG even at 1600°C.On the doped ones, randomly grown platelets of lanthanum magnesium hexaaluminate form a porous interlocking structure. Presence of various percentages of neodymium oxide significantly modifies the porous interlocking microstructure into self-reinforced, card-house like microstructure. Platelets of rare earth rich magnesium hexaaluminate were grown preferentially more than the stoichiometric rare earth magnesium hexaaluminate at elevated temperature greater than 1450°C. Rare earth rich magnesium hexaaluminate platelets formed the skeleton of a card house structure and the tiny platelets of stoichiometric rare earth magnesium hexaaluminate fill the rest. Lattice parameters of the hexagonal unit cell (c and a) decrease, relative density increases and pore size distribution remained almost unaltered with the increment of doping concentration.

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“…The most common TBC material is yttria-stabilized zirconia (YSZ) due to its high temperature stability, low thermal diffusivity, and relatively high coefficient of thermal expansion (CTE) [4,5]. Currently, state-of-the-art TBCs are based on the 7-8wt.%Y 2 O 3 -stabilized ZrO 2 top coat deposited by atmospheric plasma spraying (APS) or electron-beam physical vapor deposition (EB-PVD) on MCrAlY (M=Ni and/or Co) bond coat [5,6]. During service at elevated temperatures, oxygen transported through the top coat by diffusion through the connected porosity or ionic conduction causes the bond coat to oxidize, primarily forming Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermal Shock Behavior of Plasma-Sprayed NiCoCrAlY/YSZ Thermal Barrier Coatings

Jamali

Mozafarinia

Razavi

et al. 2012

AMR

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ZrO2-8wt.%Y2O3 (8YSZ) thermal barrier coatings (TBCs) were deposited by atmospheric plasma spraying (APS) on NiCoCrAlY-coated Inconel 738LC substrates. The thermal shock behavior was investigated by quenching the samples in water with temperature of 20-25°C from 950°C. To study of failure mechanism results from thermal cycling, microstructural evaluation using scanning electron microscope (SEM), elemental analysis using energy dispersive spectroscopy (EDS) and phasic analysis using x-ray diffractometry (XRD) were done. The results revealed that failure of the TBC system was due to the spallation of ceramic top coat. Thermal mismatch stress was the major factor of TBC failure in thermal shock test.

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Thermal-shock resistance of LnMgAl11O19 (Ln=La, Nd, Sm, Gd) with magnetoplumbite structure

Cited by 27 publications

References 27 publications

Thermal cycling behaviors of the plasma sprayed thermal barrier coatings of hexaluminates with magnetoplumbite structure

Thermal cycling behaviors of the plasma sprayed thermal barrier coatings of hexaluminates with magnetoplumbite structure

Sintering and Microstructural Modification of Seeded and Neodymium Doped Lanthanum Hexaaluminate

Investigation of Thermal Shock Behavior of Plasma-Sprayed NiCoCrAlY/YSZ Thermal Barrier Coatings

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