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Research Article | Open Access

Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W)

Dong-Li Hua,b, Hui Gua( ), Ji Zouc, Qiang Zhengd, Guo-Jun Zhange
School of Materials Sciences and Engineering, Materials Genome Institute, Shanghai University, Shanghai, 200444, China
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
School of Metallurgy and Materials, University of Birmingham, B15 2TT, UK
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Research Institute of Function Materials, Donghua University, Shanghai, 201620, China

Peer review under responsibility of The Chinese Ceramic Society.

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Highlights

• Core-rim structures are common in UHTCs and associated with bisolubility of dopants by solution-reprecipitation.

• Sharp boundary between core/rim leads to intra-phase relation, evaluated by g-point in the sintering schedule.

• Core-rim structures contain strain energy for self-strengthening; metal diffusion can strengthen grain boundary.

Graphical Abstract

Abstract

Core‒rim structures were identified as a common feature in hot-pressed ZrB2‒SiC‒MC ceramics (M = Nb, Hf, Ta and W) by a combination of X-ray diffraction, scanning and transmission electron microscopies. Quantitative analyses associate them with the bi-solubility of M in ZrB2 phase, in which transition of solubility across the core/rim boundary is abrupted, signifying their creation via dissolution‒reprecipitation process facilitated by transient liquid-phase. The cores were retained from starting powder after surface melting and the rims were grown from the liquid-phase to incorporate more solutes, leaving the residual liquid to turn into ZrC phase with higher solubility of M. We propose g-point scheme in the ZrB2‒MB2 diagrams to combine the bi-solubility and the core‒rim structures into an intra-phase relationship created by sintering, leading further to a hierarchical phase relationship. The temperature dependence of flexural strength in the ZrB2‒SiC‒MC ceramics varies with MC additions, which can be respectively strengthened by the strain energy created in the core‒rim structures and metal segregation to grain boundaries.

Keywords

Ultra-high-temperature ceramicsCore‒rim structuresBi-solubilitySolution‒reprecipitation process

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Journal of Materiomics
Volume 7 Issue 1,
January 2021
Pages 69-79
DOI: 10.1016/j.jmat.2020.07.005
Cite this article:
Hu D-L, Gu H, Zou J, et al. Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W). Journal of Materiomics, 2021, 7(1): 69-79. https://doi.org/10.1016/j.jmat.2020.07.005

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Received: 13 March 2020
Revised: 14 June 2020
Accepted: 08 July 2020
Published: 16 August 2020
© 2020 The Chinese Ceramic Society.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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