Influence of hydrothermal carbon coating on the properties of CF/ZrB2/SiBCN prepared by slurry injection

Cheng, Fang; Hu, Ping; Dong, Shun; Feng, Jia; Xun, Liancai; Zhang, Xinghong

doi:10.1016/j.jeurceramsoc.2020.08.019

Cited by 15 publications

(5 citation statements)

References 40 publications

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“…The diffraction abilities of transition metal atoms can be described by their atomic scattering factor, which is proportional to the corresponding atomic order numbers [34]. The higher diffraction intensity of the (100) plane could be attributed to the substitution of Zr and Hf atoms with higher atomic order numbers, such as Nb and Ta [35]. The elemental mapping diagrams (Fig.…”

Section: Preparation Of Heb and Heb-sic Ceramicsmentioning

confidence: 99%

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Huang,

Wang,

Fang

et al. 2024

Journal of Advanced Ceramics

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High-entropy diborides (HEBs) are considered as promising high-temperature structure materials owing to their high melting point and excellent thermal stability. However, the intrinsic brittleness is the main obstacle that seriously limits their practical applications. To overcome with this obstacle, carbon fibers (C f ) with outstanding mechanical properties are used in the present work as a first attempt to improve the damage tolerance of HEBs. The as-prepared C f /(Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 -SiC composite (C f /HEB-SiC) shows high relative density (97.9%) and good mechanical properties with flexural strength of 411±3 MPa and fracture toughness of 6.15±0.11 MPa•m 1/2 . More importantly, the damage tolerance parameter (D t ) has increased from 0.10 m 1/2 for HEB-SiC to 0.29 m 1/2 for C f /HEB-SiC. Through microstructural analysis and Vickers indentation of the composite, the toughening mechanisms are disclosed. The carbon fibers coated with carbon coatings demonstrate unique capacity for prolonging the crack propagation path, which promotes the reliability of the composite effectively. Moreover, the C f /(Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 -SiC composite also exhibits good static oxidation resistance in the temperature range of 1100-1500 ℃ in air due to the formation of the protective oxide layer constituting of multicomponent oxides (Zr)HfTiO 4 and (Zr)Hf 6 Ta 2 O 17 embedded in a continuous SiO 2 glass. These results are promising, and this primary work can be used as a reference to the synthesis of C f /HEBs for thermal protection materials under hightemperature serving conditions.

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Section: Preparation Of Heb and Heb-sic Ceramicsmentioning

confidence: 99%

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Huang,

Wang,

Fang

et al. 2024

Journal of Advanced Ceramics

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“…Therefore, the fracture surface of C0.5 after heat treatment at 1900 °C was flat (figure 7(c)), and it showed somewhat brittle fracture behavior (figure 8). mechanical properties can be maintained even at 1900 °C, which is promising for applications involving microwave absorption [25], high-temperature ablation resistance [26], and structural components [27].…”

Section: Microstructures and Properties Of Composites After Heat Trea...mentioning

confidence: 99%

Effects of pyrocarbon interphase on microstructure and properties of C/SiBCN composites

Cheng

Chen

2023

Mater. Res. Express

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C/SiBCN composites are expected to have widespread application in aerospace applications due to the excellent high-temperature stability. However, the interfacial reactions between the carbon fibers and the SiBCN matrix at high temperatures have significantly limited the practical application of these composites in the aerospace field. In this paper, different thicknesses of pyrocarbon (PyC) interphase (0.1 μm, 0.25 μm, and 0.5 μm) were introduced by chemical vapor deposition (CVD) process. The interface bonding of C/SiBCN composites with 0.1 μm and 0.25 μm interphase was relatively weak and the composites with 0.5 μm interphase exhibited strong interface bonding strength. After heat treatment at 1600 °C, the mechanical properties of the C/SiBCN composites with the 0.5-μm-thick interphase was maintained at 131 MPa, and at 105 MPa even after heat treatment at 1900 °C, which indicated their excellent high-temperature mechanical properties. In short, 0.5-μm-thick PyC interphase can effectively improve the interfacial reaction of the C/SiBCN composites, which contributed to the application of the composites in high temperature environment.

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“…In spite of the promising property of multiphase ceramics, 24–26 the improvement mechanisms on mechanical properties of metal‐SiBCN remain unclear. To date, few deductions have been previously reported.…”

Section: Introductionmentioning

confidence: 99%

“…10,16,17 Typically, multiphase ceramics with metals are commonly employed as aeronautical materials, due to their excellent performance under extreme thermal shock. [18][19][20][21][22][23] In spite of the promising property of multiphase ceramics, [24][25][26] the improvement mechanisms on mechanical properties of metal-SiBCN remain unclear. To date, few deductions have been previously reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zr on the solid sintering process of SiBCN ceramics: Diffusion couple method experiment and DFT calculation

Zhang,

Chen

et al. 2023

J Am Ceram Soc.

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The impact of Zr addition on the solid sintering process of SiBCN multiphase ceramics was investigated under high temperatures. To gain deep insight, SiBCN‐Zr diffusion couple method (sample preparation at 1500–1800°C) was utilized in conjunction with first‐principles calculations. Significantly, the results demonstrated the formation of SiC and BN as well as ZrC/ZrB2 at the interface of the diffusion couples. Possible mechanisms have been analyzed and proposed. On the one hand, the extensive generations of defects are supposed to facilitate the formation of SiC and ZrC during the preparation of SiBCN amorphous powders. On the other hand, the presence of distinctive BN(C) structures in SiBCN hindered the formation of ZrB2, thus causing a delay in its formation. Through first‐principles calculations, remarkable variations in interatomic bonding strengths have been revealed among the different phases at the interface. Specifically, interfaces of ZrC/ZrB2 and SiC exhibit stronger bonding strengths compared to BN and SiC, implying that Zr, and its compounds may act as binding agents.

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Influence of hydrothermal carbon coating on the properties of CF/ZrB2/SiBCN prepared by slurry injection

Cited by 15 publications

References 40 publications

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Effects of pyrocarbon interphase on microstructure and properties of C/SiBCN composites

Effect of Zr on the solid sintering process of SiBCN ceramics: Diffusion couple method experiment and DFT calculation

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Influence of hydrothermal carbon coating on the properties of CF/ZrB2/SiBCN prepared by slurry injection

Cited by 15 publications

References 40 publications

Improved damage tolerance and oxidation resistance of (Ti 0.2Zr 0.2Hf 0.2Nb 0.2Ta 0.2)B 2–SiC by introducing chopped carbon fibers

Improved damage tolerance and oxidation resistance of (Ti 0.2Zr 0.2Hf 0.2Nb 0.2Ta 0.2)B 2–SiC by introducing chopped carbon fibers

Effects of pyrocarbon interphase on microstructure and properties of C/SiBCN composites

Effect of Zr on the solid sintering process of SiBCN ceramics: Diffusion couple method experiment and DFT calculation

Contact Info

Product

Resources

About

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers