A novel high-entropy (Sm0.2Eu0.2Tb0.2Dy0.2Lu0.2)2Zr2O7 ceramic aerogel with ultralow thermal conductivity
Source abstract
Abstract
Abstract Here, we report a novel high-entropy rare earth zirconate (HE-REZ) (Sm0.2Eu0.2Tb0.2Dy0.2Lu0.2)2Zr2O7 ceramic aerogel prepared through a sol-gel template method and high-temperature calcination followed by 3-D-structure reconstruction. The structural evolution and crystallisation behaviour of the prepared aerogel were characterised through scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The results indicated that the as-prepared HE-REZ ceramic aerogels had a typical nanoporous structure. The HE-REZ ceramic aerogels thermally treated at 900 °C presented an ultralow room temperature thermal conductivity of 0.031 W/(m·K), high specific surface areas of 443.26 m2/g and a relatively high strength of 12.95 MPa. The effects of different calcination temperatures on the microstructure of the samples were also investigated. Therefore, the excellent insulation performance of these unique HE-REZ ceramic aerogels indicate that they can be used as high-temperature insulators for hypersonic vehicles in the future.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Catalysis and Oxidation Reactions · Glass properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
Show source-provided references
1. The evolution of thermal barrier coatings-status and upcoming solutions for today's key issues10.1016/S0257-8972(99)00342-4 ↗
2. Bose · 2007 · 155
3. Analysis and testing of high temperature fibrous insulation for reusable launch vehicles
4. Aerogels as promising thermal insulating materials: an overview
5. Ultralow density silica aerogels by alcohol supercritical drying10.1016/S0022-3093(98)00322-6 ↗
6. Cluster structure of silica aerogel investigated by laser ablation10.1016/S0965-9773(98)00129-9 ↗
7. High strength SiO2 aerogel insulation10.1016/S0022-3093(98)00106-9 ↗
8. Applications for silica aerogel products10.1016/S0022-3093(98)00054-4 ↗
9. Chemical engineering of aerogel morphology formed under nonsupercritical conditions for thermal insulation10.1021/cm9903428 ↗
10. High‐strength mullite fibers reinforced ZrO2- SiO2 aerogels fabricated by rapid gel method10.1007/s10853-015-9308-2 ↗
11. Preparation and characterization of high surface area ZrO2 aerogel modified by SiO210.1007/s10934-015-9971-3 ↗
12. Novel Al2O3‐SiO2 composite aerogels with high specific surface area at elevated temperatures with different alumina/silica molar ratios prepared by a non-alkoxide sol-gel method10.1039/C5RA19764C ↗
13. Novel self-reinforcing ZrO2-SiO2 aerogels with high mechanical strength and ultralow thermal conductivity10.1016/j.ceramint.2018.05.199 ↗
14. Oxidation resistance of (Hf-Ta-Zr-Nb)C high entropy carbide powders compared with the component monocarbides and binary carbide Powders10.1016/j.scriptamat.2020.10.038 ↗
15. Deep eutectic solvent-induced high-entropy structures in boron nitride for boosted initiation of aerobic oxidative desulfurization of diesel10.1016/j.apsusc.2020.146980 ↗
16. Structure and magnetic properties of a class of spinel high-entropy oxides10.1016/j.jmmm.2021.168063 ↗
17. Thermo-physical properties of rare earth stabilized irconia and zirconate pyrochlore surrogates for actinide doped zirconia
18. Review of high entropy ceramics: design, synthesis, structure and properties10.1039/C9TA05698J ↗
19. A step forward from high-entropy ceramics to compositionally-complex ceramics: a new perspective10.1007/s10853-020-04583-w ↗
20. High-entropy thermal barrier coating of rare-earth zirconate: a case study on (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 prepared by atmospheric plasma spraying10.1016/j.jeurceramsoc.2020.07.061 ↗
21. Multicomponent high-entropy zirconates with comprehensive properties for advanced thermal barrier coating10.1016/j.scriptamat.2019.12.006 ↗
22. High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials10.1007/s40145-019-0342-4 ↗
23. La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7: a novel high-entropy ceramic with low thermal conductivity and sluggish grain growth rate10.1016/j.jmst.2019.05.054 ↗
24. High-entropy ceramics: present status, challenges, and a look forward10.1007/s40145-021-0477-y ↗
25. Advances on strategies for searching for next generation thermal barrier coating materials10.1016/j.jmst.2018.11.016 ↗
26. Materials selection guidelines for low thermal conductivity thermal barrier coatings10.1016/S0257-8972(02)00593-5 ↗
27. Structure and conductivity of pyrochlore and fluorite type solid solutions10.1016/0167-2738(81)90306-4 ↗
28. New entropy-stabilized oxide with pyrochlore structure: Dy2(Ti0.2Zr0.2Hf0.2Ge0.2Sn0.2)2O7, J. Alloy
29. The pyrochlore to ‘defect fluorite’ transition in the Y2(ZryTi1y)2O7 system and its underlying crystal chemistry10.1016/j.jssc.2004.09.014 ↗
30. A resol‐assisted cationic coordinative Co‐assembly approach to mesoporous ABO3 perovskite oxides with rich oxygen vacancy for enhanced hydrogenation of furfural to furfuryl alcohol10.1002/ange.202012416 ↗
31. Order-disorder transition and unconventional thermal conductivities of the (Sm1-xYbx)2Zr2O7 series10.1111/j.1551-2916.2010.04113.x ↗
32. Heavy-ion irradiation effects in Gd2(Ti2-xZrx)O7 pyrochlores10.1016/S0022-3115(00)00696-6 ↗
33. The structural transformation from the pyrochlore structure, A2B2O7, to the fluorite structure, AO2, studied by Raman spectroscopy and defect chemistry modeling10.1006/jssc.2000.9142 ↗
34. Investigating the local structure of lanthanoid hafnates Ln2Hf2O7 via diffraction and spectroscopy10.1021/jp311329q ↗
35. Rare-earth zirconate Ln2Zr2O7 (ln: La, Nd, Gd, and Dy) powders, xerogels, and aerogels: preparation, structure, and properties10.1021/acs.inorgchem.9b01965 ↗
36. Highly porous multicomponent (Hf1/3Ta1/3Nb1/3)C ultra-high temperature ceramic with low thermal conductivity
37. Thermal conductivity of highly porous ceramic foams with different agar concentrations10.1016/j.matlet.2014.08.096 ↗
38. Porous Y2SiO5 ceramic with low thermal conductivity10.1016/S1005-0302(12)60133-9 ↗
39. YSZ fiber reinforced highly porous γ-(Y0.8Ho0.2)2Si2O7 ceramic with multifunctional thermal insulation and microwave-transmitting property10.1016/j.matlet.2020.128894 ↗
40. Multiple thermal resistance induced extremely low thermal conductivity in porous SiC-SiO2 ceramics with hierarchical porosity10.1016/j.jeurceramsoc.2020.10.004 ↗
41. One-step synthesis of monolithic micro-nano yttria stabilized ZrO2-Al2O3 composite aerogel10.1016/j.micromeso.2017.09.025 ↗
42. Polyvinylidene fluoride aerogel with high thermal stability and low thermal conductivity10.1016/j.matlet.2019.126890 ↗
43. Rapid synthesis of dual-mesoporous silica aerogel with excellent adsorption capacity and ultra-low thermal conductivity10.1016/j.jnoncrysol.2020.120547 ↗
44. Evidence for percolation-controlled conductivity in amorphous AsxTe1x films10.1103/PhysRevLett.33.1042 ↗
45. Microstructure and properties of highly porous Y2SiO5 ceramics produced by a new water-based freeze casting10.1016/j.matdes.2012.11.020 ↗
46. Alloy design strategies and future trends in high-entropy alloys10.1007/s11837-013-0761-6 ↗
47. Mechanical properties of NbMoTaW and VNbMoTaW refractory high entropy alloys10.1016/j.intermet.2011.01.004 ↗
48. Microstructure and mechanical properties of porous Si3N4 ceramics prepared by freeze-casting10.1016/j.matdes.2011.06.023 ↗
49. Novel high‐temperature‐resistant Y2SiO5 aerogel with ultralow thermal conductivity10.1111/ijac.13258 ↗