Effects of temperature on flexural behavior and flaw sensitivity of ZrB2-SiC-graphite composite

Kong, Dewen; Wang, Qiaoyan; She, Tingting; Wang, Lingling

doi:10.1016/j.jallcom.2018.09.319

Cited by 10 publications

(2 citation statements)

References 28 publications

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“…Thus, strengthening and toughening are among the most important research topics related to UHTCs, aiming to find an optimal balance between strength and toughness, with stable thermal shock resistance and oxidation resistance at the same time. Scientists and engineers investigated many approaches, such as particle toughening [31,32], soft graphite phase toughening [33,34], whisker toughening [35,36], and fiber toughening [37,38], to induce crack deflection and bifurcation and inhibit the crack tip propagation. Among these toughening phases, three-dimensional (3D) carbon fibers were considered the most promising material due to excellent room and high-temperature mechanical properties, continuously providing a strengthening and toughening skeleton.…”

Section: Introduction mentioning

confidence: 99%

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Cheng

Xun

et al. 2021

J Adv Ceram

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Finding the optimum balance between strength and toughness, as well as acquiring reliable thermal shock resistance and oxidation resistance, has always been the most concerned topic in the discussion of ultra-high temperature ceramic composites. Herein, PyC modified 3D carbon fiber is used to reinforce ultra-high temperature ceramic (UHTC). The macroscopic block composite with large size is successfully fabricated through low temperature sintering at 1300 °C without pressure. The prepared PyC modified 3D Cf/ZrC-SiC composites simultaneously possess excellent physical and chemical stability under the synergistic effect of PyC interface layer and low temperature sintering without pressure. The fracture toughness is increased in magnitude to 13.05 ± 1.72 MPa·m1/2 accompanied by reliable flexural strength of 251 ± 27 MPa. After rapid thermal shock spanning from room temperature (RT) to 1200 °C, there are no visible surface penetrating cracks, spalling, or structural fragmentation. The maximum critical temperature difference reaches 875 °C, which is nearly three times higher than that of traditional monolithic ceramics. The haunting puzzle of intrinsic brittleness and low damage tolerance are resolved fundamentally. Under the protection of PyC interface layer, the carbon fibers around oxide layer and matrix remain structure intact after static oxidation at 1500 °C for 30 min. The oxide layer has reliable physical and chemical stability and resists the erosion from fierce oxidizing atmosphere, ensuring the excellent oxidation resistance of the composites. In a sense, the present work provides promising universality in designability and achievement of 3D carbon fiber reinforced ceramic composites.

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Section: Introduction mentioning

confidence: 99%

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Cheng

Xun

et al. 2021

J Adv Ceram

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show abstract

mentioning

confidence: 99%

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Cheng

Xun

et al. 2021

Preprint

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To find the optimum balance between strength and toughness, as well as acquiring reliable thermal shock resistance and oxidation resistance, has always been the most concerned topic in the discussion of ultra-high temperature ceramic composites. Herein, PyC modified 3D carbon fiber is used to reinforce ultra-high temperature ceramic. The macroscopic block composite with large size is successfully fabricated through ultra-low temperature sintering at 1300°C without pressure. The prepared PyC modified 3D Cf/ZrC-SiC composites simultaneously possess excellent physical and chemical stability under the synergistic effect of PyC interface layer and ultra-low temperature sintering without pressure. The fracture toughness is increased in magnitude to 13.05 ± 1.72 MPa∙m1/2 accompanied by reliable flexural strength of 251 ± 27 MPa. After rapid thermal shock spanning from RT to 1200°C, there is no visible surface penetrating cracks, spalling or structural fragmentation. The maximum critical temperature difference reaches 875°C, which is nearly three times higher than that of traditional monolithic ceramics. The haunting puzzle of intrinsic brittleness and low damage tolerance are resolved fundamentally. Under the protection of PyC interface layer, the carbon fibers around oxide layer and matrix remain structure intact after static oxidation at 1500°C for 30 min. The oxide layer has reliable physical and chemical stability and resist the erosion from fierce oxidizing atmosphere, ensuring the excellent oxidation resistance of the composites. In a sense, the present work provides promising universality in designability and achievement of 3D carbon fiber reinforced ceramic composites.

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Synthesis of a new orthorhombic form of diamond in varying-C VN films: Microstructure, mechanical and tribological properties

Cai

Wang

et al. 2019

Applied Surface Science

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Effects of temperature on flexural behavior and flaw sensitivity of ZrB2-SiC-graphite composite

Cited by 10 publications

References 28 publications

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Synthesis of a new orthorhombic form of diamond in varying-C VN films: Microstructure, mechanical and tribological properties

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