Densification, mechanical and thermal properties of ZrC1− ceramics fabricated by two-step reactive hot pressing of ZrC and ZrH2 powders

Wei, Boxin; Chen, Lei; Wang, Yujin; Zhang, Haibin; Peng, Shuming; Ouyang, Jia‐Hu; Wang, Dong; Zhou, Yu

doi:10.1016/j.jeurceramsoc.2017.09.027

Cited by 45 publications

(56 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…equation is superimposed upon the experimental data of lattice parameter versus C/Zr from old literature (1960s-1970s) 13,14 , recent literature 8,11,12,17,20,26,36,37 and the experimental data presented in this work. Figure 5 deliberately combines experimental data from zirconium carbide ZrC x 8,[11][12][13][14]26,[36][37][38] and oxycarbide ZrC x O y 17,20,21,38 studies. Recent data on oxycarbide production were not reported in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Recent studies 8,11,12,20,25 have shown a linear relationship or polynomial relationships between lattice parameter and C/Zr atomic ratio and it is remarkable that the authors presenting this new correlations were working on either ZrC x 8,11,12 or ZrC x O y 20,25 . Zhou et al 26 discuss the difficulties encountered for the determination of carbon and nitrogen inclusions in ZrC x using XRD and they confirmed the expected usefulness of neutron diffraction to determine accurately carbon and oxygen stoichiometries.…”

mentioning

confidence: 98%

“…Zhou et al 26 discuss the difficulties encountered for the determination of carbon and nitrogen inclusions in ZrC x using XRD and they confirmed the expected usefulness of neutron diffraction to determine accurately carbon and oxygen stoichiometries. However, neutron diffraction could not or was not used for the characterization of ZrC x specimens in other literature 8,[11][12][13][14]20,25 , obviously because this technique is quite difficult to access (only ~20 facilities worldwide having an external users program 27 ). Other techniques such as Raman spectroscopy that could be used to detect the presence of microcrystalline carbon or amorphous carbon in carbide systems 28,29 , or X-ray photoelectron spectroscopy (XPS) that can also help distinguish the nature of bonds present in the sample, if the metal in the carbide is bonded with carbon, oxygen 30 or nitrogen 31 , are not often used within the ceramic processing community.…”

mentioning

confidence: 99%

See 2 more Smart Citations

On the stoichiometry of zirconium carbide

Gasparrini

Rana

Brun

et al. 2020

Sci Rep

View full text Add to dashboard Cite

the dependencies of the enhanced thermomechanical properties of zirconium carbide (Zrc x) with sample purity and stoichiometry are still not understood due to discrepancies in the literature. Multiple researchers have recently reported a linear relation between the carbon to zirconium atomic ratio (c/Zr) and the lattice parameter, in contrast with a more established relationship that suggests that the lattice parameter value attains a maximum value at a C/Zr ~ 0.83. In this study, the relationship between C/Zr atomic ratio and the lattice parameter is critically assessed: it is found that recent studies reporting the thermophysical properties of Zrc x have unintentionally produced and characterised samples containing zirconium oxycarbide. to avoid such erroneous characterization of Zrc x thermophysical properties in the future, we propose a method for the accurate measurement of the stoichiometry of ZrC x using three independent experimental techniques, namely: elemental analysis, thermogravimetric analysis and nuclear magnetic resonance spectroscopy. Although a large scatter in the results (Δc/Zr = 0.07) from these different techniques was found when used independently, when combining the techniques together consistent values of x in Zrc x were obtained. Zirconium carbide (ZrC) is a much-promising material, it has received increased interest recently as an alternative material to silicon carbide (SiC) in nuclear fuel applications 1,2 , in next-generation nuclear fusion reactors 3 , and also as an ultra-high-temperature ceramic to be used in ceramic-metal composite heat exchangers in concentrated solar power (CSP) plants 4,5. ZrC (here denoted as ZrC x) is typically non-stoichiometric as it can contain up to 50% of unoccupied carbon sites 6,7 , it has been found that deviations in the stoichiometry of ZrC x can severely affect its thermal and mechanical properties 8,9. Given its potential in high-temperature applications, it is extremely important to define a method that robustly determines its stoichiometry and purity. The purity of ZrC x should always be assessed as the presence of contaminants such as nitrogen or oxygen is detrimental for its performance. For example, if ZrC x is to be used as a nuclear fuel coating in a nuclear reactor, any nitrogen contamination should be avoided due to the production of radioactive 14 C from nitrogen 14 N inside the reactor 10. There are two common methods for defining the stoichiometry of ZrC x. The first one is to evaluate the C/Zr atomic ratio from the lattice parameter measured by X-ray diffraction (XRD) using the correlation published in Jackson & Lee 6. The second one is to quantify through the inert-gas fusion technique the carbon content in ZrC x and calculate the C/Zr atomic ratio assuming that the sample is free from impurities. Both techniques, however, have limitations and when used in standalone approaches can lead to erroneous stoichiometry estimations, as we will proceed to demonstrate later in this paper. The need for an established robust method to measure ...

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 98%

mentioning

confidence: 99%

See 1 more Smart Citation

On the stoichiometry of zirconium carbide

Gasparrini

Rana

Brun

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Several studies have attempted to improve the sinterability, microstructure, and mechanical properties of ZrC ceramics. Some studies have used secondary phases such as SiC, MoSi 2 , TaSi 2 , Si, Zr, ZrH 2 , C, MC (M = V, Nb, and Ta) as sintering additives . The addition of SiC is attractive because of its high temperature strength, wear and corrosion resistance, and thermal shock resistance .…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have used secondary phases such as SiC, MoSi 2 , TaSi 2 , Si, Zr, ZrH 2 , C, MC (M = V, Nb, and Ta) as sintering additives. 5,[9][10][11][12][13][14][15][16][17][18][19] The addition of SiC is attractive because of its high temperature strength, wear and corrosion resistance, and thermal shock resistance. 2 As a result, SiC is routinely added to ultra-high temperature ceramics to improve their microstructure and properties as well as resistance to oxidation, thermal shock, and ablation.…”

mentioning

confidence: 99%

Densification, microstructure, and mechanical properties of ZrC–SiC ceramics

Fahrenholtz

Watts

et al. 2019

J Am Ceram Soc

View full text Add to dashboard Cite

ZrC–SiC ceramics were fabricated by high‐energy ball milling and reactive hot pressing of ZrH2, carbon black, and varying amounts of SiC. The ceramics were composed of nominally pure ZrC containing 0 to 30 vol% SiC particles. The relative density increased as SiC content increased, from 96.8% for nominally pure ZrC to 99.3% for ZrC‐30 vol% SiC. As SiC content increased from 0 to 30 vol%, Young's modulus increased from 404 ± 11 to 420 ± 9 GPa and Vickers hardness increased from 18.5 ± 0.7 to 23.0 ± 0.5 GPa due to a combination of the higher relative density of ceramics with higher SiC content and the higher Young's modulus and hardness of SiC compared to ZrC. Flexure strength was 308 ± 11 MPa for pure ZrC, but increased to 576 ± 49 MPa for a SiC content of 30 vol%. Fracture toughness was 2.3 ± 0.2 MPa·m1/2 for pure ZrC and increased to about 3.0 ± 0.1 MPa·m1/2 for compositions containing SiC additions. The combination of high‐energy ball milling and reactive hot pressing was able to produce ZrC–SiC ceramics with sub‐micron grain sizes and high relative densities with higher strengths than previously reported for similar materials.

show abstract

A Highly Deficient Medium‐Entropy Perovskite Ceramic for Electromagnetic Interference Shielding under Harsh Environment

Liu,

Tuo,

Dai

et al. 2024

Advanced Materials

View full text Add to dashboard Cite

Materials that can provide reliable electromagnetic interference (EMI) shielding in highly oxidative atmosphere at elevated temperature are indispensable in the fast‐developing aerospace field. However, most of conductor‐type EMI shielding materials such as metals can hardly withstand the high‐temperature oxidation, while the conventional dielectric‐type materials cannot offer sufficient shielding efficiency in gigahertz (GHz) frequencies. Here, we demonstrate a highly deficient medium‐entropy (ME) perovskite ceramic as an efficient EMI shielding material in harsh environment. The synergistic effect of entropy stabilization and aliovalent substitution on A‐site generate abnormally high concentration of Ti and O vacancies that is stable under high‐temperature oxidation. Due to the clustering of vacancies, the highly deficient perovskite ceramic exhibits giant complex permittivity and polarization loss in GHz, leading to the specific EMI shielding effectiveness above 30 dB/mm in X‐band even after 100 hours of annealing at 1000 °C in air. Along with the low thermal conductivity, the aliovalent ME perovskite can serve as a bifunctional shielding material for applications in aircraft engines and reusable rockets.This article is protected by copyright. All rights reserved

show abstract

Densification, mechanical and thermal properties of ZrC1− ceramics fabricated by two-step reactive hot pressing of ZrC and ZrH2 powders

Cited by 45 publications

References 34 publications

On the stoichiometry of zirconium carbide

On the stoichiometry of zirconium carbide

Densification, microstructure, and mechanical properties of ZrC–SiC ceramics

A Highly Deficient Medium‐Entropy Perovskite Ceramic for Electromagnetic Interference Shielding under Harsh Environment

Contact Info

Product

Resources

About