Designable density defect influencing the mechanical property of 3D needled C/SiC composites

Mei, Hui; Tan, Yuanfu; Chen, Ting; Huang, Wenjie; Cheng, Laifei

doi:10.1016/j.jallcom.2019.07.163

Cited by 20 publications

(3 citation statements)

References 18 publications

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“…The tensile strength changes slightly, and the strength after heat‐treated at 1900°C is lower than that at 1700°C. This indicates that the post‐heat‐treatment tensile strengths of C/SiC composites are closely related to initial strength and increasing HTT 11,12 …”

Section: Resultsmentioning

confidence: 79%

“…This indicates that the post-heat-treatment tensile strengths of C/SiC composites are closely related to initial strength and increasing HTT. 11,12 In fact, the initial strengths of 2D C/SiC composites are determined by the thickness of PyC interface layer. The strength of sample S1 with thinner PyC increases gradually with the increase of HTT, while the strength of sample S2 with thicker PyC does not change significantly.…”

Section: Resultsmentioning

confidence: 99%

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The effect of heat treatment on tensile properties of 2D C/SiC composites

Mei

Lü

Zhou

et al. 2020

Int J Applied Ceramic Tech

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Two-dimensional (2D) carbon fiber reinforced silicon carbide (C/SiC) composites with different initial strength were prepared by chemical vapor infiltration (CVI). After tensile property testing, results exhibited that as the heat-treatment temperature (HTT) increases to 1900°C, the tensile strength and toughness of the low strength specimen (LSS) increased by 110% and 530%, while the high strength specimen (HSS) increased by 5.4% and 550%, respectively. As observed from morphologies, the heat treatment increases the graphitization of the amorphous PyC interphase, which leads to the weakening of interfacial bonding strength (IBS). Meanwhile, the defects arising from heat treatment cause thermal residual stress relaxation. Therefore, the tensile strength and toughness of LSS with relatively high initial IBS increase significantly as HTT increases. For HSS with moderate initial IBS, the heat treatment slightly improves the tensile strength, but significantly improves the toughness. Consequently, the post-heat-treatment tensile properties of 2D C/SiC composites can be regulated by varying HTTs and different initial strength.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

The effect of heat treatment on tensile properties of 2D C/SiC composites

Mei

Lü

Zhou

et al. 2020

Int J Applied Ceramic Tech

Self Cite

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show abstract

“…Meanwhile, such multiple layered structures enable the concentrated loads to be transferred and dispersed, thereby protecting the composites from damage. In addition, as one of the important preparation techniques, chemical vapor infiltration (CVI) exhibits such advantages of near‐net‐shape, high purity of matrix, low process temperature, and less damage to fibers, which is attractive for fabricating high‐performance ceramic helical spring towards practical applications 6,17,18 . Therefore, the combination of carbon fiber preforms with great flexibility and SiC ceramics with high hardness, is expected to provide both tough and strong springs.…”

Section: Introductionmentioning

confidence: 99%

Fiber reinforced SiC ceramic helical spring for high elasticity and large deformation at high temperature

Yang

Zhao

Chang

et al. 2021

Int J Applied Ceramic Tech

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Ceramic spring devices play a significant role in mechanical systems, developing advanced ceramic helical spring with combination of high toughness and good elasticity still remains challenging. Herein, C/SiC composite helical springs with good elastic response to temperatures were fabricated by chemical vapor infiltration method. The C/SiC springs with rectangular and circular coil structures show high densities of 2.04 ± 0.162 and 1.96 ± 0.132 g/cm3, respectively. In contrast, C/SiC spring with circular coil structure can achieve high toughness of 0.92 ± 0.004 N/mm and low energy loss of 9.13 × 10−3 J at room temperature, while also exhibit an ideal spring constant of 0.35 N/mm and low energy loss of 7.82 × 10−2 J at 1000°C, which are highly comparable with those reported traditional ceramic springs. Furthermore, through finite element simulations, the stress distribution shows that both springs generate residual stresses at different temperatures after several cycles. The more uniform stress distribution and small irreversible deformation can be responsible for the superior elasticity of C/SiC spring with circular coil structure. The proposed strategy holds promising potential for developing C/SiC composite helical spring for future elastic devices used in complex and extreme service environments.

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Effects of non-uniform needled microstructure on failure mechanisms of 3D needled composites thick-walled cylinder under axial compression and internal pressure

Wang

Jiang

et al. 2023

J Mater Sci

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Designable density defect influencing the mechanical property of 3D needled C/SiC composites

Cited by 20 publications

References 18 publications

The effect of heat treatment on tensile properties of 2D C/SiC composites

The effect of heat treatment on tensile properties of 2D C/SiC composites

Fiber reinforced SiC ceramic helical spring for high elasticity and large deformation at high temperature

Effects of non-uniform needled microstructure on failure mechanisms of 3D needled composites thick-walled cylinder under axial compression and internal pressure

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