Crystallinity dependence of high-temperature oxidation of silicoboron carbonitride monoliths

Liang, Bin; Zhu, Qunyi; Liao, Xingqi; Liu, Kangwei; Yang, Zhihua; Jia, Dechang; Zhou, Yu

doi:10.1016/j.corsci.2021.109473

Cited by 4 publications

(2 citation statements)

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“…Silicoboron carbonitride (SiBCN) metastable ceramic is a new type of high-temperature structural-functional ceramic, which has long-range disordered and shortrange ordered amorphous state at low temperature and nanocapsule-like structure characteristics at high temperature. 1,2 Due to its unique microstructure, SiBCN ceramics have more excellent performance characteristics at high-temperature than traditional silicon-based ceramics, [3][4][5] such as lowest oxidation coefficient among nonoxide ceramics, lower thermal expansion coefficient, and excellent high temperature mechanical properties, 6,7 and can even meet the service requirements at high temperature of 2000 • C. 8,9 However, like most ceramics, the brittleness and poor thermal shock resistance of SiBCN ceramics hinder its practical application. The toughness can be improved by adding reinforcements such as fibers, whiskers, particles, graphenes, and carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal shock properties of C_f/SiBCN composite: Effect of sintering densification and fiber coating

et al. 2022

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In this work, resin-derived carbon coating was prepared on carbon fibers by polymer impregnation pyrolysis method, then silicoboron carbonitride powder was prepared by mechanical alloying, and finally carbon fiber-reinforced silicoboron carbonitride composites were prepared by hot-pressing process. The effects of sintering densification and fiber coating on microstructure, mechanical properties, thermal shock resistance, and failure mechanisms of the composites were studied. Fiber bridging hinders the sintering densification, causing more defects in fiber-dense area and lower strength. However, higher sintering temperature (1800-2000 • C) can improve mechanical properties significantly, including bending strength, vickers hardness, and elastic module, because further sintering densification enhances matrix strength and fiber/matrix bonding strength, while the change of fracture toughness is not obvious (2.24-2.38 MPa⋅m 1/2 ) due to counteraction of higher debonding resistance and less pull-out length. However, fiber coating improves fracture toughness greatly via protecting carbon fibers from chemical corrosion and damage of thermal stress and external stress. Due to lower coefficient of thermal expansion, lower fiber loading ratio, less stress concentration at the fiber/matrix interface, and better defect healing effect, lower sintering temperature favors thermal shock resistance of composites, and thermal shock recession mechanisms are the damage of interface.

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Section: Introductionmentioning

confidence: 99%

Mechanical and thermal shock properties of C_f/SiBCN composite: Effect of sintering densification and fiber coating

et al. 2022

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“…Traditional silicon-based ceramics and their composites such as SiO 2 , SiC, Si 3 N 4 and their composites have excellent properties such as low density, high speci c strength, and high chemical stability, which are widely used in various high temperature structural components, such as high temperature engines, turbines, catalyst heat exchangers, combustion systems, high temperature sensors, etc [1][2][3][4]. However, when the service temperature is higher than 1500℃, their strength and oxidation resistance will decrease sharply.…”

Section: Introductionmentioning

confidence: 99%

Mechanical /thermal Shock Properties and Failure Mechanisms of Cf/SiBCN Composites Effect of Sintering Densification and Fiber Coating

Niu

Wang

Pan

et al. 2021

Preprint

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In this work, resin derived carbon coating was prepared on carbon fibers by polymer impregnation pyrolysis method (PIP), and then Cf/SiBCN composites were prepared by hot pressing process. The effects of sintering densification and fiber coating on microstructure, mechanical properties, thermal shock resistance, and failure mechanisms of the composites were studied. Fiber bridging hinders the sintering densification, causing more defects in fiber-dense area and lower strength. However, higher sintering temperature (1800-2000℃) can improve mechanical properties significantly, including bending strength, vickers hardness, and elastic module, because further sintering densification enhances matrix strength and fiber/matrix bonding strength, while the change of fracture toughness is not obvious (2.24-2.38 MPa·m1/2) due to counteraction of higher debonding resistance and less pull-out length. However, fiber coating improves fracture toughness greatly via protecting carbon fibers from chemical corrosion and damage of thermal stress and external stress. Due to lower coefficient of thermal expansion, lower fiber loading ratio, less stress concentration at the fiber/matrix interface and better defect healing effect, lower sintering temperature favor thermal shock resistance of composites and thermal shock recession mechanisms are the damage of interface.

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Introduction

Li,

Jia,

Yang

et al. 2024

SiBCN Ceramics and Composites Prepared by Mechanical Alloying

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Crystallinity dependence of high-temperature oxidation of silicoboron carbonitride monoliths

Cited by 4 publications

References 28 publications

Mechanical and thermal shock properties of C_f/SiBCN composite: Effect of sintering densification and fiber coating

Mechanical and thermal shock properties of C_f/SiBCN composite: Effect of sintering densification and fiber coating

Mechanical /thermal Shock Properties and Failure Mechanisms of Cf/SiBCN Composites Effect of Sintering Densification and Fiber Coating

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Crystallinity dependence of high-temperature oxidation of silicoboron carbonitride monoliths

Cited by 4 publications

References 28 publications

Mechanical and thermal shock properties of Cf/SiBCN composite: Effect of sintering densification and fiber coating

Mechanical and thermal shock properties of Cf/SiBCN composite: Effect of sintering densification and fiber coating

Mechanical /thermal Shock Properties and Failure Mechanisms of Cf/SiBCN Composites Effect of Sintering Densification and Fiber Coating

Introduction

Contact Info

Product

Resources

About

Mechanical and thermal shock properties of C_f/SiBCN composite: Effect of sintering densification and fiber coating

Mechanical and thermal shock properties of C_f/SiBCN composite: Effect of sintering densification and fiber coating