Mechanical and thermal properties of LaMgAl11O19

Jiang, Bochen; Fang, Minghao; Huang, Zhaohui; Liu, Y.G.; Peng, Pai; Zhang, Junfeng

doi:10.1016/j.materresbull.2010.06.014

Cited by 39 publications

(10 citation statements)

References 14 publications

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“…Therefore, there is a strong need to develop new candidate materials with lower conductivities and good phase stability to enhance the efficiency of gas engines. So far, there are many new materials with complex crystal structures that have been investigated for thermal barrier coating application, such as pyrochlore, magnetoplumbite, perovskite, and garnet [7][8][9][10][11]. Stannates with pyrochlore structure have good phase stability up to their melting points (>2000 o C) [12,13], which is much higher than that of 8YSZ (~1200 o C).…”

Section: Introductionmentioning

confidence: 99%

Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Wang

Wheatley

et al. 2015

Materials & Design

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Section: Introductionmentioning

confidence: 99%

Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Wang

Wheatley

et al. 2015

Materials & Design

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“…Compared to YSZ, which is the most promising TBC materials, high‐entropy RE 2 (Y 0.2 Yb 0.2 Nb 0.2 Ta 0.2 Ce 0.2 ) 2 O 7 oxides exhibit similar TECs and much lower thermal conductivity, which make them distinct from the other promising TBC materials. [ 25,51–62 ] Figure 7B shows the XRD patterns of high‐entropy RE 2 (Y 0.2 Yb 0.2 Nb 0.2 Ta 0.2 Ce 0.2 ) 2 O 7 oxides after being treated at 1500°C for 50 h. It is obvious that there is no detectable phase decomposition or transformation can be observed, indicating the superior phase stability of high‐entropy RE 2 (Y 0.2 Yb 0.2 Nb 0.2 Ta 0.2 Ce 0.2 ) 2 O 7 oxides under high‐temperature and long‐term thermal exposure conditions.…”

Section: Resultsmentioning

confidence: 99%

Phase evolution and thermophysical properties of high‐entropy RE₂(Y_0.2Yb_0.2Nb_0.2Ta_0.2Ce_0.2)₂O₇ oxides

Wang

et al. 2022

J Am Ceram Soc.

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Pursuing novel thermal barrier–coating materials with lower thermal conductivity and high‐temperature stability can simultaneously improve the working efficiency and service temperature of a gas turbine. In this study, a series of high‐entropy RE2(Y0.2Yb0.2Nb0.2Ta0.2Ce0.2)2O7 (RE = La, Nd, Sm, Gd, Dy, and Er) oxides were prepared though solid‐state reaction. Through tuning the rare‐earth cations, an order–disorder transition occurs from certain partially ordered weberite structure (C2221) to disordered defective fluorite structure (Fm3¯$\bar{3}$m). All the high‐entropy RE2(Y0.2Yb0.2Nb0.2Ta0.2Ce0.2)2O7 oxides possess low thermal conductivity in the range of 0.91–1.34 W m−1 K−1 at room temperature, which can be attributed to increased lattice anharmonicity and disorder, resulting in additional phonon scattering. Herein, we proved that the incorporation of heterovalent cations at B‐sites in high‐entropy A2B2O7 crystals is an effective strategy to reduce the thermal conductivity without compromising the decrease of oxygen vacancy. Moreover, the high‐entropy RE2(Y0.2Yb0.2Nb0.2Ta0.2Ce0.2)2O7 oxides show the relatively higher thermal expansion coefficients of 10.3–10.7 × 10−6°C−1 and excellent phase stability at elevated temperatures.

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“…Currently, the state‐of‐the‐art TBC is zirconia partially stabilized with 7‐8 wt% yttria (7‐8 YSZ) . However, when the service temperatures are above 1200°C, the 7‐8 YSZ coating will undergo the phase change and detrimental microstructures . These changes might lead to a volume increase and deteriorating thermophyiscal performances, and also promote the formation of microcrack at the same time, which finally result in the coating peeling .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is essential to explore new TBC materials with excellent heat insulation performance and stability at higher temperatures. Since the advantages of high melting point, low thermal conductivity, high coefficient of thermal expansion, and outstanding phase and thermal stability up to at least 1600°C, the magnetoplumbite‐type LnMgAl 11 O 19 (LnMA, Ln = La, Ce, Pr, Nd, Sm, Eu, Gd) materials have been proposed as promising candidates for the novel TBCs …”

Section: Introductionmentioning

confidence: 99%

Dependence of crystal structure on mechanical and thermophysical properties of magnetoplumbite‐type LnMgAl₁₁O₁₉ ceramics with substitution of Ln³⁺ Ions

Zhao¹,

Min²,

Fang³

et al. 2019

Int J Applied Ceramic Tech

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Lanthanum hexaaluminate is a promising candidate to establish yttria partially stabilized zirconia as a thermal barrier coating material for super alloy due to their remarkable stability and thermophysical performance. In order to understand the relationship between the structure and properties and gain new low thermal conducting materials, the LnMgAl11O19 (LnMA, Ln: La, Pr, Nd, Sm, Eu, Gd) materials were synthesized firstly and further used to produce the LnMA ceramics. With the increasing relative atomic mass of the replaced Ln3+ ions from La to Gd, the lattice parameters and grain sizes of the LnMA platelets decrease, while the mechanical properties increase, and the thermal physic properties decrease. The GdMgAl11O19 ceramics obtain the lowest thermal conductivity with the value of 1.91‐1.78 W/m K in the range from room temperature to 800°C, which could be considered as a promising candidate for application in thermal barrier coating materials. These results could further provide reference for developing novel materials lower thermal conductivity.

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Mechanical and thermal properties of LaMgAl11O19

Cited by 39 publications

References 14 publications

Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Phase evolution and thermophysical properties of high‐entropy RE₂(Y_0.2Yb_0.2Nb_0.2Ta_0.2Ce_0.2)₂O₇ oxides

Dependence of crystal structure on mechanical and thermophysical properties of magnetoplumbite‐type LnMgAl₁₁O₁₉ ceramics with substitution of Ln³⁺ Ions

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Mechanical and thermal properties of LaMgAl11O19

Cited by 39 publications

References 14 publications

Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Phase evolution and thermophysical properties of high‐entropy RE2(Y0.2Yb0.2Nb0.2Ta0.2Ce0.2)2O7 oxides

Dependence of crystal structure on mechanical and thermophysical properties of magnetoplumbite‐type LnMgAl11O19 ceramics with substitution of Ln3+ Ions

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Phase evolution and thermophysical properties of high‐entropy RE₂(Y_0.2Yb_0.2Nb_0.2Ta_0.2Ce_0.2)₂O₇ oxides

Dependence of crystal structure on mechanical and thermophysical properties of magnetoplumbite‐type LnMgAl₁₁O₁₉ ceramics with substitution of Ln³⁺ Ions