AI Chat Paper
Discover the SciOpen Platform and Achieve Your Research Goals with Ease.
Search articles, authors, keywords, DOl and etc.
{{expandStatus?'Exit ':''}}Advanced Search
CrTaO4 (or Cr0.5Ta0.5O2) has been unexpectedly found to play a decisive role in improving the oxidation resistance of Cr and Ta-containing refractory high-entropy alloys (RHEAs). This rarely encountered complex oxide can effectively prevent the outward diffusion of metal cations from the RHEAs. Moreover, the oxidation kinetics of CrTaO4-forming RHEAs is comparable to that of the well-known oxidation resistant Cr2O3- and Al2O3-forming Ni-based superalloys. However, CrTaO4 has been ignored and its mechanical and thermal properties have yet to be studied. To fill this research gap and explore the untapped potential for its applications, here we report for the first time the microstructure, mechanical and thermal properties of CrTaO4 prepared by hot-press sintering of solid-state reaction synthesized powders. Using the HAADF and ABF-STEM techniques, rutile crystal structure was confirmed and short range ordering was directly observed. In addition, segregation of Ta and Cr was identified. Intriguingly, CrTaO4 exhibits elastic/mechanical properties similar to those of yttria stabilized zirconia (YSZ) with Young’s modulus, shear modulus, and bulk modulus of 268, 107, and 181 GPa, respectively, and Vickers hardness, flexural strength, and fracture toughness of 12.2±0.44 GPa, 142±14 MPa, and 1.87±0.074 MPa·m1/2. The analogous elastic/mechanical properties of CrTaO4 to those of YSZ has spurred inquiries to lucrative leverage it as a new thermal barrier material. The measured melting point of CrTaO4 is 2103±20 K. The anisotropic thermal expansion coefficients are αa = (5.68±0.10)×10−6 K−1, αc = (7.81±0.11)×10−6 K−1, with an average thermal expansion coefficient of (6.39±0.11)×10−6 K−1. The room temperature thermal conductivity of CrTaO4 is 1.31 W·m−1·K−1 and declines to 0.66 W·m−1·K−1 at 1473 K, which are lower than most of the currently well-known thermal barrier materials. From the perspective of matched thermal expansion coefficient, CrTaO4 pertains to an eligible thermal barrier material for refractory metals such as Ta, Nb, and RHEAs, and ultrahigh temperature ceramics. As such, this work not only provides fundamental microstructure, elastic/mechanical and thermal properties that are instructive for understanding the protectiveness displayed by CrTaO4 on top of RHEAs but also outreaches its untapped potential as a new thermal barrier material.
Dimiduk DM, Perepezko JH. Mo–Si–B alloys: Developing a revolutionary turbine-engine material. MRS Bull 2003, 28: 639–645.
Ye YF, Wang Q, Lu J, et al. High-entropy alloy: Challenges and prospects. Mater Today 2016, 19: 349–362.
Senkov ON, Wilks GB, Miracle DB, et al. Refractory high-entropy alloys. Intermetallics 2010, 18: 1758–1765.
Senkov ON, Miracle DB, Chaput KJ, et al. Development and exploration of refractory high entropy alloys—A review. J Mater Res 2018, 33: 3092–3128.
Miracle DB, Tsai MH, Senkov ON, et al. Refractory high entropy superalloys (RSAs). Scripta Mater 2020, 187: 445–452.
Liu CM, Wang HM, Zhang SQ, et al. Microstructure and oxidation behavior of new refractory high entropy alloys. J Alloys Compd 2014, 583: 162–169.
Gorr B, Mueller F, Christ HJ, et al. High temperature oxidation behavior of an equimolar refractory metal-based alloy 20Nb–20Mo–20Cr–20Ti–20Al with and without Si addition. J Alloys Compd 2016, 688: 468–477.
Müller F, Gorr B, Christ HJ, et al. On the oxidation mechanism of refractory high entropy alloys. Corros Sci 2019, 159: 108161.
Gorr B, Müller F, Schellert S, et al. A new strategy to intrinsically protect refractory metal based alloys at ultra high temperatures. Corrosion 2020, 166: 108475.
Lo KC, Chang YJ, Murakami H, et al. An oxidation resistant refractory high entropy alloy protected by CrTaO4-based oxide. Sci Rep 2019, 9: 7266.
Ren WL, Ouyang FF, Ding B, et al. The influence of CrTaO4 layer on the oxidation behavior of a directionally-solidified nickel-based superalloy at 850–900℃. J Alloys Compd 2017, 724: 565–574.
Roebben G, Bollen B, Brebels A, et al. Impulse excitation apparatus to measure resonant frequencies, elastic moduli, and internal friction at room and high temperature. Rev Sci Instrum 1997, 68: 4511–4515.
He LF, Zhou YC, Bao YW, et al. Synthesis, physical, and mechanical properties of bulk Zr3Al3C5 ceramic. J Am Ceram Soc 2007, 90: 1164–1170.
Zhao ZF, Xiang HM, Dai FZ, et al. Preparation and mechanical properties of β-Zr2O(PO4)2: A soft and damage tolerant ceramic with machinability and good thermal shock resistance. J Eur Ceram Soc 2020, 40: 155–164.
Liu JX, Shen XQ, Wu Y, et al. Mechanical properties of hot-pressed high-entropy diboride-based ceramics. J Adv Ceram 2020, 9: 503–510.
Tilley R. Understanding solids; the science of materials. Mater Technol 2004, 19: 256.
Li YW, Liu YX, Öchsner PE, et al. Temperature dependent fracture toughness of KNN-based lead-free piezoelectric ceramics. Acta Mater 2019, 174: 369–378.
Leitner J, Voňka P, Sedmidubský D, et al. Application of Neumann–Kopp rule for the estimation of heat capacity of mixed oxides. Thermochim Acta 2010, 497: 7–13.
Leitner J, Chuchvalec P, Sedmidubský D, et al. Estimation of heat capacities of solid mixed oxides. Thermochim Acta 2002, 395: 27–46.
Dai RQ, Cheng RF, Wang JM, et al. Tunnel-structured willemite Zn2SiO4: Electronic structure, elastic, and thermal properties. J Adv Ceram 2022, 11: 1249–1262.
Young DJ, Pint BA. Chromium volatilization rates from Cr2O3 scales into flowing gases containing water vapor. Oxid Met 2006, 66: 137–153.
Androš Dubraja L, Pajić D, Vrankić M, et al. Single-step preparation of rutile-type CrNbO4 and CrTaO4 oxides from oxalate precursors–characterization and properties. J Am Ceram Soc 2019, 102: 6697–6704.
Rietveld HM. A profile refinement method for nuclear and magnetic structures. J Appl Cryst 1969, 2: 65–71.
Donnay JDH, Harke D. A new law of crystal morphology extending the law of Bravais. Am Mineral 1937, 22: 446–467.
Findlay SD, Shibata N, Ikuhara Y, et al. Annular bright-field scanning transmission electron microscopy: Direct and robust atomic-resolution imaging of light elements in crystalline materials. Micros Today 2017, 25: 36–41.
Chen XF, Wang Q, Cheng ZY, et al. Direct observation of chemical short-range order in a medium-entropy alloy. Nature 2021, 592: 712–716.
Panina ES, Yurchenko NY, Zherebtsov SV, et al. Structures and mechanical properties of Ti−Nb−Cr−V−Ni−Al refractory high entropy alloys. Mater Sci Eng A 2020, 786: 139409.
Mu YK, Liu HX, Liu YH, et al. An ab initio and experimental studies of the structure, mechanical parameters and state density on the refractory high-entropy alloy systems. J Alloys Compd 2017, 714: 668–680.
Wang XF, Xiang HM, Sun X, et al. Mechanical properties and damage tolerance of bulk Yb3Al5O12 ceramic. J Mater Sci Technol 2015, 31: 369–374.
Wang JY, Zhou YC. Recent progress in theoretical prediction, preparation, and characterization of layered ternary transition-metal carbides. Annu Rev Mater Res 2009, 39: 415–443.
Barsoum MW. The M n +1AX n phases: A new class of solids; thermodynamically stable nanolaminates. Prog Solid State Chem 2000, 28: 201–281.
Zhou YC, Xiang HM, Dai FZ, et al. Electrical conductive and damage-tolerant nanolaminated MAB phases Cr2AlB2, Cr3AlB4 and Cr4AlB6. Mater Res Lett 2017, 5: 440–448.
Zhou YC, Xiang HM, Hu CF. Extension of MAX phases from ternary carbides and nitrides (X = C and N) to ternary borides (X = B, C, and N): A general guideline. Int J Appl Ceram Technol 2023, 20: 803–822.
Anderson OL. A simplified method for calculating the debye temperature from elastic constants. J PhysChem Solids 1963, 24: 909–917.
Liu B, Liu YC, Zhu CH, et al. Advances on strategies for searching for next generation thermal barrier coating materials. J Mater Sci Technol 2019, 35: 833–851.
Cvetkovic K. Periodic table of the oxides. Am Cream Soc Bull 2000, 79: 67–72.
Zhao ZF, Xiang HM, Chen H, et al. High-entropy (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)4Al2O9 with good high temperature stability, low thermal conductivity, and anisotropic thermal expansivity. J Adv Ceram 2020, 9: 595–605.
Zhao XH, Zhao M, Ren XR, et al. Thermal conductivity prediction in air plasma sprayed thermal barrier coatings containing multifarious defects. J Am Ceram Soc 2021, 104: 4788–4802.
Sun ZQ, Zhou YC, Wang JY, et al. Thermal properties and thermal shock resistance of γ-Y2Si2O7. J Am Ceram Soc 2008, 91: 2623–2629.
Bruls RJ, Hintzen HT, Metselaar R. A new estimation method for the intrinsic thermal conductivity of nonmetallic compounds. J Eur Ceram Soc 2005, 25: 767–779.
Kingery WD. Thermal conductivity: XII, temperature dependence of conductivity for single-phase ceramics. J Am Ceram Soc 1955, 38: 251–255.
Clarke DR, Levi CG. Materials design for the next generation thermal barrier coatings. Annu Rev Mater Res 2003, 33: 383–417.
Liu B, Wang JY, Li FZ, et al. Theoretical elastic stiffness, structural stability and thermal conductivity of La2T2O7 (T = Ge, Ti, Sn, Zr, Hf) pyrochlore. Acta Mater 2010, 58: 4369–4377.
Wang XF, Xiang HM, Sun X, et al. Thermal properties of a prospective thermal barrier material: Yb3Al5O12. J Mater Res 2014, 29: 2673–2681.
Zhou YC, Xiang HM, Lu XP, et al. Theoretical prediction on mechanical and thermal properties of a promising thermal barrier material: Y4Al2O9. J Adv Ceram 2015, 4: 83–93.
Goretta KC, Park ET, Koritala RE, et al. Thermomechanical response of polycrystalline BaZrO3. Phys C Supercond 1998, 309: 245–250.
Hirata Y, Itoh S, Shimonosono T, et al. Theoretical and experimental analyses of Young’s modulus and thermal expansion coefficient of the alumina–mullite system. Ceram Int 2016, 42: 17067–17073.
Fernández-Carrión AJ, Allix M, Becerro AI. Thermal expansion of rare-earth pyrosilicates. J Am Ceram Soc 2013, 96: 2298–2305.
Sun ZQ, Wu L, Li MS, et al. Preparation of Y2Si2O7/ZrO2 composites and their composition–mechanical properties–tribology relationships. J Am Ceram Soc 2013, 96: 3228–3238.
Kassem R, Al Nasiri N. A comprehensive study on the mechanical properties of Yb2SiO5 as a potential environmental barrier coating. Surf Coat Technol 2021, 426: 127783.
Elliott RO, Kempter CP. Thermal expansion of some transition metal carbides. J Phys Chem 1958, 62: 630–631.
Zhao M, Ren XR, Yang J, et al. Low thermal conductivity of rare-earth zirconate-stannate solid solutions (Yb2Zr2O7)1– x (Ln2Sn2O7) x (ln = Nd, Sm). J Am Ceram Soc 2016, 99: 293–299.
Yang J, Wan CL, Zhao M, et al. Effective blocking of radiative thermal conductivity in La2Zr2O7/LaPO4 composites for high temperature thermal insulation applications. J Eur Ceram Soc 2016, 36: 3809–3814.
Hu WP, Lei YM, Zhang J, et al. Mechanical and thermal properties of RE4Hf3O12 (RE = Ho, Er, Tm) ceramics with defect fluorite structure. J Mater Sci Technol 2019, 35: 2064–2069.
Wei ZY, Meng GH, Chen L, et al. Progress in ceramic materials and structure design toward advanced thermal barrier coatings. J Adv Ceram 2022, 11: 985–1068.
Clarke DR, Phillpot SR. Thermal barrier coating materials. Mater Today 2005, 8: 22–29.
Tian ZL, Zheng LY, Li ZJ, et al. Exploration of the low thermal conductivities of γ-Y2Si2O7, β-Y2Si2O7, β-Yb2Si2O7, and β-Lu2Si2O7 as novel environmental barrier coating candidates. J Eur Ceram Soc 2016, 36: 2813–2823.
Sun ZQ, Li MS, Zhou YC. Thermal properties of single-phase Y2SiO5. J Eur Ceram Soc 2009, 29: 551–557.
Liu B, Wang JY, Zhou YC, et al. Theoretical elastic stiffness, structure stability and thermal conductivity of La2Zr2O7 pyrochlore. Acta Mater 2007, 55: 2949–2957.
Zhao M, Pan W, Wan CL, et al. Defect engineering in development of low thermal conductivity materials: A review. J Eur Ceram Soc 2017, 37: 1–13.
1517
Views
483
Downloads
1
Crossref
2
Web of Science
2
Scopus
0
CSCD
Altmetrics
This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).
京公网安备11010802044758号