Microstructure and tensile behavior of multiply needled C/SiC composite fabricated by chemical vapor infiltration

Nie, Jingjiang; Ye, Xu; Zhang, Litong; Cheng, Laifei; Ma, Jun

doi:10.1016/j.jmatprotec.2008.02.035

Cited by 62 publications

(18 citation statements)

References 18 publications

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“…8 Accumulated energy with strain and time 无机材料学报第 35 卷图 9 累积事件数随应变和时间的变化 Fig. 9 Accumulated number of AE events with strain and time 阶段 [25] , 但通过声发射研究方法, 即使在损伤起始阶段仍有明显的微观断裂事件。此阶段声发射事件以基体微裂纹扩展、热解炭界面损伤和单丝纤维断裂等低能声发射信号为主。C/SiC 复合材料在制备过程中会产生热应力, 同时微结构内的孔隙也会成为裂纹源 [30][31] , 并在较低应力下扩展。加载开始时, 材料残余热应力释放, 当局部应力超过 SiC 基体的承载能力后, SiC 基体孔隙作为裂纹源产生微裂纹并扩展, 同时随着应力的增大, 在低强度的 SiC 区域开始出现基体裂纹 [32] 。由于纤维对基体微裂纹扩展有阻隔作用, 裂纹沿着界面产生偏转, 发生界面脱粘 [30] , 如图 7(c)所示。同时纤维束中少量…”

Section: 材料损伤演化分析unclassified

Acoustic Emission Pattern Recognition on Tensile Damage Process of C/SiC Composites Using an Improved Genetic Algorithm

Zhang

Tong

Yao

et al. 2020

Journal of Inorganic Materials

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The acoustic emission data collected during room temperature tensile test of 2D-C/SiC composites were analyzed by hierarchical clustering and unsupervised pattern recognition method based on an improved genetic algorithm. Combined with the SEM observation on the fracture surface, five damage modes were identified and their typical acoustic emission characteristics were obtained. According to the analysis of energy distribution, cumulative event number and cumulative energy of different damage modes, the damage evolution process of C/SiC composites can be divided into four stages. The first stage (damage initiation stage) shows mainly matrix microcracks and interface debonding. In the second stage, matrix crack reaches saturated and then causes a considerable quantity of interlaminar delamination and fiber failure. The third stage is a gradual damage development stage and all kinds of damage keep occurring except the breakage of fiber bundles. In the last stage, a large amount of fiber bundles break and the sample eventually fails.

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Section: 材料损伤演化分析unclassified

Acoustic Emission Pattern Recognition on Tensile Damage Process of C/SiC Composites Using an Improved Genetic Algorithm

Zhang

Tong

Yao

et al. 2020

Journal of Inorganic Materials

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“…In the same work, stitched carbon fiber fabrics processed in the same way exhibited a Young's modulus of 62-64 GPa. Nie et al (2009) also found a Young's modulus of 75±4 GPa for a needled carbon fiber densified with a SiC matrix, obtained by the CVI technique. These properties can be compared with those shown in Table 5 and Table 6.…”

Section: From Input Parameters Frommentioning

confidence: 65%

Modeling elastic and thermal properties of 2.5D carbon fiber C/SiC hybrid matrix composites by homogenization method

Pardini¹,

Gregori²

2010

JATM

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Advanced carbon fiber hybrid carbon-ceramic matrix composites are realizing their potential in many thermostructural components for aerospace vehicles. This work presents ab-initio predictions of elastic constants and thermal properties for 2.5D carbon fiber reinforced carbon-silicon carbide hybrid matrix composites, by using the homogenization technique. The homogenization technique takes properties of individual components of the composites (fiber and matrix) and characteristics of the geometrical architecture of the preform to perform calculations. Ab-initio modeling of mechanical and thermal properties is very attractive, especially during the material development stage, when larger samples may be prohibitively expensive or impossible to fabricate. Modeling is also useful when bigger samples would be prohibitively expensive or impractical. Thermostructural composites made of 2.5D preforms are easy to manufacture in relation to 3D preforms. Besides, 2.5D preforms are also resistant to thermo cycling and have high resistance to crack propagation in relation to ply stacked composites such as unidirectional (1D) and bidirectional (2D) structures. The calculations were performed by setting an overall carbon fiber volume fraction at 40, 45 and 50 for a 2D stacked composite, and volume fraction in Z-direction of 2, 4 and 6.

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“…The reaction temperature of chemical vapor infiltration was 1100°C, the reaction time was 30 h, and the molar ratio of H 2 to CH 3 SiCl 3 was 1 : 10. The final density of C/SiC composites was 2.1 cm 3 / g. More details of the chemical vapor infiltration preparation process of unidirectional C/SiC composites can be obtained from literature [25]. The fibers were approximately cylindrical and the interface was obvious, Figure 2a.…”

Section: Materials Design and Preparationmentioning

confidence: 99%

Effect of fiber orientation on surface microscopic characteristics of surface grinding of unidirectional C/SiC composites

Zhang

Wang

Huo

et al. 2019

Materialwissenschaft Werkst

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Ceramic matrix composites have complex structures. For exploring the impact factors of machined surface quality and material removal mechanism, its internal structure must be decoupled, and then a unidirectional C/SiC composite was designed and fabricated in this paper. Through a series of representative surface grinding experiments, the machined surface of the composites was characterized by 3D profile test, and the microscopic characteristics and material removal mechanism of the grinding surface were discussed in detail. The results showed that the fiber orientation had a significant effect on the surface quality, and the order of 3D surface roughness was longitudinal > normal > transverse. On the basis of the systematic analysis of the microscopic characteristics of the machined surface, the brittle fracture was the dominant form of material removal in grinding process. Further, combined with 3D surface profile and surface micromorphology, the effect of fiber orientation on the removal mechanism of composites was revealed. The results not only enrich the machinability and improve the surface quality of unidirectional C/SiC composites, but also provide some guidance for grinding of the woven composites.

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Microstructure and tensile behavior of multiply needled C/SiC composite fabricated by chemical vapor infiltration

Cited by 62 publications

References 18 publications

Acoustic Emission Pattern Recognition on Tensile Damage Process of C/SiC Composites Using an Improved Genetic Algorithm

Acoustic Emission Pattern Recognition on Tensile Damage Process of C/SiC Composites Using an Improved Genetic Algorithm

Modeling elastic and thermal properties of 2.5D carbon fiber C/SiC hybrid matrix composites by homogenization method

Effect of fiber orientation on surface microscopic characteristics of surface grinding of unidirectional C/SiC composites

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