Influence of pyrolysis and melt infiltration temperatures on the mechanical properties of SiCf/SiC composites

Four kinds of raw C/C composites with a density between 1.25~1.66g/㎤ were used in order to investigate the effect of the initial porosity of C/C composites on mechanical properties of liquid silicon infiltrated C/SiC composites. The microstructure observation, image analysis and flexural strength test of the composites were performed. The density and microstructural changes with the variation of the initial porosity was discussed in the terms of the infiltration behavior of liquid silicon and the reaction between liquid silicon and matrix carbon.

Download Full-text

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.816.71 ◽

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.

Download Full-text

Effect of C/C preform density on microstructure and mechanical properties of C/C–SiC composites prepared by alloyed reactive melt infiltration

Materials Science and Technology ◽

10.1179/1743284712y.0000000077 ◽

2012 ◽

Vol 28 (12) ◽

pp. 1505-1512 ◽

Cited By ~ 4

Author(s):

Y G Tong ◽

S X Bai ◽

H Zhang ◽

Y C Ye

Keyword(s):

Mechanical Properties ◽

Microstructure And Mechanical Properties ◽

Melt Infiltration ◽

Sic Composites ◽

Reactive Melt Infiltration ◽

Reactive Melt

Download Full-text

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.620-622.371 ◽

2009 ◽

Vol 620-622 ◽

pp. 371-374 ◽

Cited By ~ 2

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).

Download Full-text