Oxidation behaviour of laminated BN/ZrB2–SiC ceramics

Liu, Xinchao; Wei, Chuncheng; Ji, Wenyi; Li, Shuang; Wang, Peng; Zhou, Lijuan

doi:10.1016/j.ceramint.2018.02.029

Cited by 9 publications

(5 citation statements)

References 32 publications

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“…This improvements may be attributed to the defect-healing effect of the SiO 2 layer formed during the oxidation process though porous structure is formed on the surface. 19,20 S3 has almost similar flexural strength (998 MPa) and fracture toughness (12.2 MPaÁm 1/2 ) in contrast with S1. Thus, it is believed that the formation of porous Ca 2 Al 2 SiO 7 coating has limited influences on the flexural strength and fracture toughness of Al 2 O 3 -ZrO 2 -SiC composite.…”

Section: Resultsmentioning

confidence: 99%

“…18 Moreover, SiC could be oxidized to SiO 2 during annealing process in air, which may heal the surface defects. 19,20 More importantly, SiO 2 can be used as Si source to generate silicate substance (e.g., gehlenite (Ca 2 Al 2 SiO 7 )) coating via solid state reaction, 21 which was believed to improve the adhesion strength by forming a thin reaction layer between the coating and ceramic substrates. 22 In addition, Ca 2 Al 2 SiO 7 possesses a medium thermal expansion coefficient of 7.9 × 10 À6 /°C 23 that is very close to that of ZTA (8.35 × 10 À6 /°C), 11 suggesting a good match between Ca 2 Al 2 SiO 7 and ZTA substrate.…”

Section: Introductionmentioning

confidence: 99%

“…It can be seen that the flexural strength and fracture toughness of S2 are higher than those of S1 (Figure4(a)). This improvements may be attributed to the defect-healing effect of the SiO 2 layer formed during the oxidation process though porous structure is formed on the surface 19,20. S3 has almost similar flexural strength (998 MPa) and fracture toughness (12.2 MPaÁm 1/2 ) in contrast with S1.…”

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Fabrication of porous gehlenite coating on Al₂O₃–ZrO₂–SiC composite ceramics and its in vitro biological activities

Chen

et al. 2022

J Biomater Appl

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Porous gehlenite coatings on Al2O3–ZrO2–SiC composite ceramics were prepared by electro-spraying technique combined with reactive sintering method. The influences of gehlenite coating on the mechanical property of the ceramics and biological activity of the coating were investigated. The results indicated that the gehlenite coating has limited influences on flexural strength and fracture toughness of the ceramics, and the coating has elastic modulus of 82 GPa, hardness of 2.2 GPa, and adhesive strength of 1512 mN, suggesting its potential application in load-bearing ceramic implants. Simulated body fluid soaking test, CCK-8 and alkaline phosphatase activity assay demonstrated that the porous gehlenite coating has strong mineralization ability, which promotes proliferation and differentiation of MC3T3-E1 cells. These excellent biological performances can be attributed to the synergistic effect of the porous surface of the coating and its release of Ca2+ and Si4+.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Fabrication of porous gehlenite coating on Al₂O₃–ZrO₂–SiC composite ceramics and its in vitro biological activities

Chen

et al. 2022

J Biomater Appl

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“…Liu et al [36] studied the oxidation and mechanical behavior of laminated ZrB2-SiC/BN materials manufactured by tape casting and hot-pressing. The fracture toughness and flexural strength were improved by oxidation for 30 min at 1300 °C, due to the healing effect of the imperfections of the oxidation-induced glassy SiO2 layer.…”

Section: Introductionmentioning

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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“…However, these weak interfacial materials have poor thermal stability, ablation resistance, and strength retention in hightemperature and oxidative environments, which severely degrade the high-temperature properties and oxidation resistance of ceramic materials. Furthermore, polymers, 25 carbon materials (graphite), 31 and BN 32 generate large amounts of gas (CO, CO 2 , B 2 O 3 , and N 2 ) during oxidative ablation, and many pores remain in the weak interface, which may lead to the deterioration of the oxidation ablation performance of ceramics. Therefore, it is necessary to select a weak interface phase with better ablation resistance and a high content of ceramic to suppress the formation of oxide channels and avoid further erosion of the internal materials.…”

Section: Introductionmentioning

confidence: 99%

ZrB₂-Based “Brick-and-Mortar” Composites Achieving the Synergy of Superior Damage Tolerance and Ablation Resistance

Cheng

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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The intrinsic brittleness and poor damage tolerance of ultrahigh-temperature ceramics are the key obstacles to their engineering applications as nonablative thermal protection materials. Biomimetic layered or “brick-and-mortar” hybrid composites composed of alternative strong/weak interfaces exhibit excellent strength and high toughness; however, the commonly used interfacial materials are weak and have poor thermal stability and ablation resistance, which strictly limit their use in high-temperature and oxidative environments. In this work, ZrB2-based “brick-and-mortar” hybrid ceramics were constructed with a hierarchical biomimetic design to improve the fracture resistance and damage tolerance. ZrB2–20vol %SiC ceramics containing 30 vol % reduced graphene oxide nanosheets were used as the weak interface to increase crack growth resistance without destroying the excellent ablation resistance. Finally, the ZrB2-based “brick-and-mortar” composites achieve the synergy of superior damage tolerance and ablation resistance.

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Oxidation behaviour of laminated BN/ZrB2–SiC ceramics

Cited by 9 publications

References 32 publications

Fabrication of porous gehlenite coating on Al₂O₃–ZrO₂–SiC composite ceramics and its in vitro biological activities

Fabrication of porous gehlenite coating on Al₂O₃–ZrO₂–SiC composite ceramics and its in vitro biological activities

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

ZrB₂-Based “Brick-and-Mortar” Composites Achieving the Synergy of Superior Damage Tolerance and Ablation Resistance

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Oxidation behaviour of laminated BN/ZrB2–SiC ceramics

Cited by 9 publications

References 32 publications

Fabrication of porous gehlenite coating on Al2O3–ZrO2–SiC composite ceramics and its in vitro biological activities

Fabrication of porous gehlenite coating on Al2O3–ZrO2–SiC composite ceramics and its in vitro biological activities

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

ZrB2-Based “Brick-and-Mortar” Composites Achieving the Synergy of Superior Damage Tolerance and Ablation Resistance

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Fabrication of porous gehlenite coating on Al₂O₃–ZrO₂–SiC composite ceramics and its in vitro biological activities

Fabrication of porous gehlenite coating on Al₂O₃–ZrO₂–SiC composite ceramics and its in vitro biological activities

ZrB₂-Based “Brick-and-Mortar” Composites Achieving the Synergy of Superior Damage Tolerance and Ablation Resistance