Mechanical behaviour of chemical vapour infiltration-processed two- and three-dimensional nicalon/SiC composites

1991 ◽  
Vol 26 (11) ◽  
pp. 2954-2960 ◽  
Author(s):  
J. -M. Yang ◽  
W. Lin ◽  
C. J. Shih ◽  
W. Kai ◽  
S. M. Jeng ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Three Dimensional ◽  
Chemical Vapour ◽  
Chemical Vapour Infiltration ◽  
Sic Composites

scholarly journals Thermomechanical Behaviour of 2D-SiC/Sic Composites with Nanoscale-Multilayered (PyC/SiC)n Interphases

1999 ◽  
Vol 8 (6) ◽  
pp. 096369359900800 ◽  
Author(s):  
S. Bertrand ◽  
F. Germain ◽  
R. Pailler ◽  
J. Lamon
Keyword(s):  
Mechanical Behaviour ◽  
Room Temperature ◽  
Chemical Vapour ◽  
Cyclic Fatigue ◽  
Thermomechanical Behaviour ◽  
Chemical Vapour Infiltration ◽  
Sic Composites ◽  
20 Nm

2D woven SiC/SiC composites, with nanoscale-multilayered (PyC/SiC)n interphases, have been made via chemical vapour infiltration of a preform of either Nicalon or Hi-Nicalon fibres. The nanoscale-multilayered (PyC/SiC)n interphases consist of n successive PyC-SiC sequences. In the present paper n = 10 and the thickness of the PyC and SiC sublayers was about 20 nm and 50 nm respectively. The influence of Hi-Nicalon fibres and multilayered interphases on the mechanical behaviour at room temperature and the lifetime in cyclic fatigue at 600°C and 1200°C was investigated. The Hi-Nicalon fibre and the multilayered interphases are shown to lead to improved 2D-SiC/SiC composites.

scholarly journals Tensile Behaviour and Damage Evolution of a C/SiC Minicomposite Fabricated by Chemical Vapour Infiltration

2010 ◽  
Vol 19 (2) ◽  
pp. 096369351001900 ◽  
Author(s):  
Yiqiang Wang ◽  
Litong Zhang
Keyword(s):  
Damage Evolution ◽  
Chemical Vapour ◽  
Tensile Behaviour ◽  
Nonlinear Behaviour ◽  
Processing Conditions ◽  
Extension Matrix ◽  
Complex Architectures ◽  
Chemical Vapour Infiltration ◽  
Sic Composites ◽  
Short Time

The tensile behaviour of a C/SiC minicomposite fabricated by chemical vapour infiltration was examined and the associated damage evolution was monitored by using acoustic emission (AE) technique. The microstructure of minicomposite can be characterized by a uniformly thick SiC sheath, the thin fibre coatings, and large pores due to the tendency of fibres to cluster in the minicomposite. The load-displacement curves of minicomposite show a greatly nonlinear behaviour with four distinct regimes: initial self-alignment due to relaxation of fibres followed by preexisting microcrack extension, matrix macrocrack multiplication and then saturation. All these regimes can be well characterized by the corresponding AE activities. Therefore, it is believed that such experimental results would be beneficial to the optimization of processing conditions and derivation of parameters necessary for further modelling of the thermomechanical behaviours of real C/SiC composites with more complex architectures by fabricating minicomposites in a short time.

Pulsed chemical vapour infiltration of SiC to three-dimensional carbon fibre preforms

1992 ◽  
Vol 27 (22) ◽  
pp. 6022-6028 ◽  
Author(s):  
K. Itoh ◽  
M. Imuta ◽  
A. Sakai ◽  
J. Gotoh ◽  
K. Sugiyama
Keyword(s):  
Carbon Fibre ◽  
Three Dimensional ◽  
Chemical Vapour ◽  
Chemical Vapour Infiltration

scholarly journals Modification of C/SIC Composites using Partial Boron Carbide Self-Sealing Matrix by ICVI

2008 ◽  
Vol 17 (2) ◽  
pp. 096369350801700
Author(s):  
Yongsheng Liu ◽  
Litong Zhang ◽  
Laifei Cheng ◽  
Wenbin Yang ◽  
Yongdong Xu
Keyword(s):  
Boron Carbide ◽  
Chemical Vapour ◽  
Strength Increase ◽  
Fracture Roughness ◽  
Pull Out ◽  
Micro Cracks ◽  
Infiltration Technique ◽  
Chemical Vapour Infiltration ◽  
Sic Composites ◽  
Sic Coatings

C/SiC composites were modified using partial boron carbide (BCx) as matrix by isothermal chemical vapour infiltration technique (ICVI). SEM results showed that the multilayer SiC-BCx matrix exist among fibre bundles, nevertheless there were still SiC matrix among monofilaments. The modified composites hold better fracture roughness than the conventional C/SiC composites, although the other mechanic properties of the two kinds of composites were similar. The pull-out of multilayer matrix was the main factor of the increase of fracture toughness. Compared with the C/SiC composites coated with SiC/SiC/SiC, SiC/B-C/SiC or SiC/B/SiC coatings, the lower weight loss and higher residual strength of the modified composites were demonstrated. Furthermore, the weight gain and strength increase of the modified composites were found after oxidation at 1000°C and 1300oC due to the self-sealing of the micro-cracks and pores as shown in SEM results.

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