Influence of the Porosity of C/C on the Characterization of C/C-SiC Composites Prepared by Reactive Melt Infiltration Method

2009 ◽  
Vol 620-622 ◽  
pp. 371-374 ◽  
Author(s):  
Ji Ping Wang ◽  
Min Lin ◽  
Yong Hui Zhang ◽  
Zhuo Xu ◽  
Zhi Hao Jin
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
The Matrix ◽  
Melt Infiltration ◽  
Lower Porosity ◽  
Sic Composites ◽  
Reactive Melt Infiltration ◽  
Reactive Melt ◽  
Infiltration Method

C/C-SiC composites were rapidly fabricated using C/C with four different porosities in the range of 12.4%~45.7% and silicon by reactive-melt-infiltrated (RMI) method. The influence of the C/C porosity on the Si infiltration during the processing and on the microstructure and mechanical properties of the resulting C/C-SiC were investigated. The results show that β-SiC was formed by Si/C reaction and free Si remained in the composites. A higher porosity of C/C leads more Si infiltrating to the preform and produces higher density of C/C-SiC with lower porosity. The flexural strength of the composites was strong influenced by the matrix content and the interface between different phases. C/C-SiC derived from C/C with 24.8% porosity has the highest flexural strength (325.1MPa).

Effect of Infiltration Temperature on the Composition and Mechanical Property of RMI C/C-SiC Composite

2015 ◽  
Vol 816 ◽  
pp. 71-77
Author(s):  
Jing Wang ◽  
Ying Bin Cao ◽  
Dong Lin ◽  
Rong Jun Liu ◽  
Chang Rui Zhang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Infiltration Process ◽  
Infiltration Temperature ◽  
Interfacial Bonding Strength ◽  
Melt Infiltration ◽  
Different Temperatures ◽  
Sic Composites ◽  
Reactive Melt Infiltration ◽  
Reactive Melt

C/C-SiC composites were prepared by reactive melt infiltration process at different temperatures. The composition, microstructures and mechanical properties of the composites were investigated. The results showed that infiltration temperature could affect composite’s properties through regulating the chemical composition and interfacial bonding strength of the composites. The C/C-SiC composite prepared at 1650°C exhibited the relatively highest performance with density of 2.24 g·cm-3 and SiC content of 31.44 vol.%. The flexural strength and the fracture toughness were 238MPa and 10.04 MPa·m1/2, respectively.

scholarly journals Fabrication of C/C–SiC–ZrB2 Ultra-High Temperature Composites through Liquid–Solid Chemical Reaction

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1352
Author(s):  
Qian Sun ◽  
Huifeng Zhang ◽  
Chuanbing Huang ◽  
Weigang Zhang
Keyword(s):  
High Temperature ◽  
Ceramic Composites ◽  
Dense Matrix ◽  
Ablation Resistance ◽  
The Matrix ◽  
Melt Infiltration ◽  
Reactive Melt Infiltration ◽  
Reactive Melt ◽  
Diffusion Precipitation ◽  
Ultra High Temperature

In this paper, we aimed to improve the oxidation and ablation resistance of carbon fiber-reinforced carbon (CFC) composites at temperatures above 2000 °C. C/C–SiC–ZrB2 ultra-high temperature ceramic composites were fabricated through a complicated liquid–solid reactive process combining slurry infiltration (SI) and reactive melt infiltration (RMI). A liquid Si–Zr10 eutectic alloy was introduced, at 1600 °C, into porous CFC composites containing two kinds of boride particles (B4C and ZrB2, respectively) to form a SiC–ZrB2 matrix. The effects and mechanism of the introduced B4C and ZrB2 particles on the formation reaction and microstructure of the final C/C–SiC–ZrB2 composites were investigated in detail. It was found that the composite obtained from a C/C–B4C preform displayed a porous and loose structure, and the formed SiC–ZrB2 matrix distributed heterogeneously in the composite due to the asynchronous generation of the SiC and ZrB2 ceramics. However, the C/C–SiC–ZrB2 composite, prepared from a C/C–ZrB2 preform, showed a very dense matrix between the fiber bundles, and elongated plate-like ZrB2 ceramics appeared in the matrix, which were derived from the dissolution–diffusion–precipitation mechanism of the ZrB2 clusters. The latter composite exhibited a relatively higher ZrB2 content (9.51%) and bulk density (2.82 g/cm3), along with lower open porosity (3.43%), which endowed this novel composite with good mechanical properties, including pseudo-plastic fracture behavior.

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