ZrB2 – SiC ceramics: Residual stresses and mechanical properties

Grigoriev, O. N.; Stepanenko, A. V.; Vinokurov, V. B.; Neshpor, I. P.; Mosina, T. V.; Silvestroni, L.

doi:10.1016/j.jeurceramsoc.2021.02.053

Cited by 21 publications

(3 citation statements)

References 22 publications

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“…Hence, the introduction of SiC accelerates diffusion during sintering and promotes the densification of diboride-based ceramics. [19][20][21][22][23][24][25][26][27] SiC could also increase the fracture toughness of diboridebased ceramics, due to the mismatch of thermal and mechanical properties between dispersed SiC particles and diboride matrix, which results in residual stress at the interface and crack deflection or bridging at or near the MB 2 /SiC interface, consuming more energy during the fracture process. 1,2,4,24 At the same time, the addition of SiC could refine the grain of MB 2 , leading to fine grain strengthening and higher fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

“…By far, SiC is the most commonly used additive, which promotes densification and reduces the sintering temperature by removing oxide impurities on the surface of diborides through a chemical reaction. Hence, the introduction of SiC accelerates diffusion during sintering and promotes the densification of diboride‐based ceramics 19–27 . SiC could also increase the fracture toughness of diboride‐based ceramics, due to the mismatch of thermal and mechanical properties between dispersed SiC particles and diboride matrix, which results in residual stress at the interface and crack deflection or bridging at or near the MB 2 /SiC interface, consuming more energy during the fracture process 1,2,4,24 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of refractory metal additives on diboride‐based ultra‐high temperature ceramics: A review

Meng

Fang

Wang³

et al. 2023

Int J Applied Ceramic Tech

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Diboride-based ultra-high temperature ceramics (UHTCs) are a special class of ceramics with excellent comprehensive properties, which have extensive potential applications in extreme environments. However, their practical applications are limited, mainly due to the poor fracture toughness and thermal shock resistance. Refractory metals have high melting points, good ductility, and high toughness, which have huge potential to improve the properties of diboridebased ceramics. As a special class of additives, they have been adopted to promote densification, improve microstructure, and properties. However, diboride-based ceramics containing refractory metals have not received adequate attention due to relatively weak practical effects on property improvement. The present review highlights the progress and existing problems of transition metal diborides with refractory metal additives, including W, Ta, Mo, Nb, Hf, V, Cr, and Zr, focusing mainly on the microstructure change and property improvements, followed by challenges and possible future development strategies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of refractory metal additives on diboride‐based ultra‐high temperature ceramics: A review

Meng

Fang

Wang³

et al. 2023

Int J Applied Ceramic Tech

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“…Wu et al [33] reported that ZrB2 and SiC have average thermal expansion coefficients of 5.2×10 -6 °C -1 and 3.3×10 -6 °C -1 , respectively. Due to such a great thermal expansion mismatch between these phases, Watts et al [38] approximated tensile stress of ~450 MPa in ZrB2 grains and compressive stress of ~880 MPa in SiC grains, which were generated during the cooling process in the ZrB2-SiC composite materials [39].…”

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confidence: 99%

Pressureless sinterability study of ZrB2–SiC composites containing hexagonal BN and phenolic resin additives

2021

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This research is dedicated to the role of different amounts of hexagonal BN (hBN: 0, 1.5, 3, and 4.5 wt%) on the pressureless sinterability of ZrB2–25 vol% SiC ceramics. Phenolic resin (5 wt%) with a carbon yield of ~40 % was incorporated as a binder to the powder mixtures and after initial cold pressing, the final sintering process was performed at 1900 °C for 100 min in a vacuum furnace. The as-sintered specimens were characterized by X-ray diffractometry, field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results disclosed that the incorporation of 1.5 wt% hBN could increase the relative density to ~92%, while the sample with zero hBN content just reached ~81% of full densification. Appropriate hBN content not only facilitated the particle rearrangement during the cold pressing, but also removed the harmful oxide impurities during the final sintering. Nevertheless, the addition of higher amounts of hBN remarkably lessened the densification because of more delamination of the non-reacted hBN flakes and release and entrapment of more gaseous by-products induced by the reacted hBN phases.

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Ultrahigh-Temperature HfB2-Based Ceramics: Structure, High-Temperature Strength, and Oxidation Resistance

Vedel

Grigoriev

Mazur

et al. 2022

Powder Metall Met Ceram

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ZrB2 – SiC ceramics: Residual stresses and mechanical properties

Cited by 21 publications

References 22 publications

Effects of refractory metal additives on diboride‐based ultra‐high temperature ceramics: A review

Effects of refractory metal additives on diboride‐based ultra‐high temperature ceramics: A review

Pressureless sinterability study of ZrB2–SiC composites containing hexagonal BN and phenolic resin additives

Ultrahigh-Temperature HfB2-Based Ceramics: Structure, High-Temperature Strength, and Oxidation Resistance

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