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High-entropy silicide ceramics developed from (TiZrNbMoW)Si2 formulation doped with aluminum

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journal contribution
posted on 2020-03-04, 11:54 authored by Yuan Qin, Jin-Cheng Wang, Ji-Xuan Liu, Xiao-Feng Wei, Fei Li, Guo-Jun Zhang, Chengxi JingChengxi Jing, Jiawei Zhao, Houzheng Wu
We report a success in synthesizing high entropy silicides (HES) compounds and manufacturing well-densified HES ceramics through spark plasma sintering. For a designed chemical formula as (Ti0.2Zr0.2Nb0.2Mo0.2W0.2)Si2, the as-synthesized HES showed a formula as (Ti0.22Zr0.06Nb0.29Mo0.22W0.21)Si2 with zirconium partially oxidized into zirconia. Doping with aluminum resulted in a HES with the same composition, promoted formation of ZrSi2 and Al2O3. XRD analysis of as-synthesized HES is well supported by the calculated diffraction data based on a 2 × 3x1 supercell with HCP crystal structure and experimental chemical composition. The cations in this HES crystal structure can occupy their positions randomly with little change of its lattice parameters and formation enthalpy.

Funding

National Natural Science Funds (No. 51873103, 51532009)

Capacity Building Project of Some Local Colleges and Universities in Shanghai (No. 17030501200)

Talent Program of Shanghai University of Engineering Science (No. 2017RC422017)

First-rate Discipline Construction of Applied Chemistry (No. 2018xk-B-06)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of the European Ceramic Society

Volume

40

Issue

8

Pages

2752 - 2759

Publisher

Elsevier BV

Version

  • AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Journal of the European Ceramic Society and the definitive published version is available at https://doi.org/10.1016/j.jeurceramsoc.2020.02.059.

Acceptance date

2020-02-27

Publication date

2020-02-28

Copyright date

2020

ISSN

0955-2219

Language

  • en

Depositor

Dr Houzheng Wu. Deposit date: 3 March 2020

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