Porous high entropy (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)B2: A novel strategy towards making ultrahigh temperature ceramics thermal insulating

doi:10.1016/j.jmst.2019.05.059

Abstract

Heng Chen, Huimin Xiang, Fu-Zhi Dai, Jiachen Liu, Yanchun Zhou. Porous high entropy (Zr_0.2Hf_0.2Ti_0.2Nb_0.2Ta_0.2)B₂: A novel strategy towards making ultrahigh temperature ceramics thermal insulating[J]. J. Mater. Sci. Technol., 2019, 35(10): 2404-2408.

Figures/Tables 6

Fig. 1. (a) Linear shrinkage and linear shrinkage rate curves and (b) TG and DTG curves recorded during the heating of a green body of porous HE (Zr0.2Hf0.2Nb0.2Ta0.2Ti0.2)B2.

Table 1 Porosity, sintered density, theoretical density and compressive strength of porous HE (Zr0.2Hf0.2Nb0.2Ta0.2Ti0.2)B2.

Porous HE UHTCs	Porosity (%)	Sintered density (g cm^-3)	Theoretical density (g cm^-3)	Compressive strength (MPa)
(Zr_0.2Hf_0.2Nb_0.2Ta_0.2Ti_0.2)B₂	75.67	2.01	8.26	3.93

Fig. 2. (a) XRD pattern of as-synthesized HE (Zr0.2Hf0.2Nb0.2Ta0.2Ti0.2)B2 together with simulated XRD patterns of ZrB2, HfB2, TiB2, TaB2 and NbB2 and (b) surface SEM image of as-prepared porous HE (Zr0.2Hf0.2Nb0.2Ta0.2Ti0.2)B2 with porosity of 75.67%.

Fig. 3. (a) SEM image of as-prepared porous HE (Zr0.2Hf0.2Nb0.2Ta0.2Ti0.2)B2 and (b-f) corresponding EDS mappings of Zr, Hf, Nb, Ta and Ti elements.

Table 2 Thermal diffusivity (α), specific heat capacity (Cp) and thermal conductivity (κ) of porous HE (Zr0.2Hf0.2Nb0.2Ta0.2Ti0.2)B2..

Temperature (K)	Porous HE (Zr_0.2Hf_0.2Nb_0.2Ta_0.2Ti_0.2)B₂
Temperature (K)	α (mm² s^-1)	C_p (J g^-1 K^-1)	κ (W m^-1 K^-1)
298	0.74	0.34	0.51
350	0.75	0.39	0.59
400	0.74	0.42	0.62
450	0.75	0.44	0.66
500	0.77	0.45	0.70

Fig. 4. Thermal conductivity vs. porosity for dense and porous UHTCs.

References

[1]	E. Wuchina, E. Opila, M. Opeka, W. Fahrenholtz, I. Talmy, Electrochem. Soc. Interf., 16(2007) 30-36 .
[2]	Y.C. Zhou, H.M. Xiang, Z.H. Feng, Z.P. Li, J. Am. Ceram. Soc., 99(2016) 2110-2119 .
[3]	J.F. Justin, A. Jankowiak AerospaceLab, 3(2011) 1-11 .
[4]	F. Monteverde, A. Bellosi, L. Scatteia, Mat. Sci. Eng. A, 485(2008) 415-421 .
[5]	W.G. Fahrenholtz, E.J. Wuchina, W.E. Lee, Y.C. Zhou, Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications, John Wiley & Sons, Inc., New Jersey (2014) 1-5.
[6]	X. Zhang, L. Xu, W. Han, L. Weng, J. Han, S. Du, Solid States Sci., 11(2009) 156-161.
[7]	A. Bellosi, F. Monteverde, D. BSciti, Int. J. Appl. Ceram. Technol., 3(2006) 32-40 .
[8]	E. Wuchina, M. Opeka, S. Causey, K. Buesking, J. Spain, A. Cull, J. Routbort, F. Guitierrez-Mora, J. Mater. Sci., 39(2004) 5939-5949 .
[9]	M. Gasch, S. Johnson, J. Marschall, J. Am. Ceram. Soc., 91(2008) 1423-1432 .
[10]	J.W. Zimmermann, G.E. Hilmas, W.G. Fahrenholtz, R.B. Dinwiddie, W.D. Porter, H. Wang, J. Am. Ceram. Soc., 91(2008) 1405-1411 .
[11]	H. Xiang, J. Wang, Y. Zhou, J. Eur. Ceram. Soc., 39(2019) 2982-2988 .
[12]	X.L. Yan, L. Constantin, Y.F. Lu, J.F. Silvain, M. Nastasi, B. Cui, J. Am. Ceram. Soc., 101(2018) 4486-4491 .
[13]	J.L. Braun, C.M. Rost, M. Lim, A. Giri, D.H. Olson, G.N. Kotsonis, G. Stan, D.W. Brenner, J.P. Maria, P.E. Hopkins, Adv. Mater., 30(2018), 1805004 .
[14]	H. Chen, H. Xiang, F.Z. Dai, J. Liu, Y. Lei, J. Zhang, Y. Zhou, J. Mater. Sci. Technol., 35(2019) 1700-1705 .
[15]	J. Francl, W.D. Kingery, J. Am. Ceram. Soc., 37(1954) 99-107 .
[16]	J. Gild, Y.Y. Zhang, T. Harrington, S. Jiang, T. Hu, M.C. Quinn, W.M. Mellor, N.X. Zhou, K. Vecchio, J. Luo, Sci. Rep., 6(2016), p. 37946.
[17]	G. Tallarita, R. Licheri, S. Garroni, R. Orrù, G. Cao, Scr. Mater., 158(2019) 100-104 .
[18]	Y. Zhang, W.M. Guo, Z.B. Jiang, Q.Q. Zhu, S.K. Sun, Y. You, K. Plucknett, H.T. Lin, Scr. Mater., 164(2019) 135-139 .
[19]	P.H. Mayrhofer, A. Kirnbauer, P. Ertelthaler, C.M. Koller, Scr. Mater., 149(2018) 93-97 .
[20]	X.F. Wang, H.M. Xiang, X. Sun, J.C. Liu, F. Hou, Y.C. Zhou, J. Am. Ceram. Soc., 98(2015) 2234-2239 .
[21]	H. Chen, H.M. Xiang, F.Z. Dai, J.C. Liu, Y.C. Zhou, J. Mater. Sci. Technol.(2019) .
[22]	Q.Q. Guo, H.M. Xiang, X. Sun, X.H. Wang, Y.C. Zhou, J. Eur. Ceram. Soc., 35(2015) 3411-3418 .
[23]	Y. Zhou, H. Xiang, Z. Feng, Z. Li, J. Mater. Sci. Technol., 31(2015) 285-294 .
[24]	J.H. She, T. Ohji, Mater. Chem. Phys., 80(2003) 610-614 .
[25]	N. Claussen, S. Wu, D. Holz, J. Eur. Ceram. Soc., 14(1994) 97-109 .
[26]	D.D. Jayaseelan, N. Kondo, M.E. Brito, T. Ohji, J. Am. Ceram. Soc., 85(2002) 267-269 .
[27]	Y. Yang, Y. Wang, W. Tian, Z. Wang, C.G. Li, Y. Zhao, H.M. Bian, Scr. Mater., 60(2009) 578-581 .
[28]	H.P. Yuan, J.G. Li, Q. Shen, L.M. Zhang, Int. J. Refract. Met. Hard Mater., 36(2013) 225-231 .
[29]	M.M. Opeka, I.G. Talmy, E.J. Wuchina, J.A. Zaykoski, S.J. Causey, J. Eur. Ceram. Soc., 19(1999) 2405-2414 .
[30]	J.M. Lonergan, D.L. McClane, W.G. Fahrenholtz, G.E. Hilmas, J. Am. Ceram. Soc., 98(2015) 2689-2691.

Porous high entropy (Zr_0.2Hf_0.2Ti_0.2Nb_0.2Ta_0.2)B₂: A novel strategy towards making ultrahigh temperature ceramics thermal insulating

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 6

References

Related Articles 0

Recommended Articles

Metrics

Comments