Preparation of Cf/SiC Composites by Chemical Liquid-Vapor Deposition Process

2012 ◽  
Vol 512-515 ◽  
pp. 804-807
Author(s):  
Min Mei ◽  
Xin Bo He ◽  
Xuan Hui Qu ◽  
Hai Feng Hu ◽  
Yu Di Zhang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Vapor Deposition ◽  
Fracture Behavior ◽  
Deposition Process ◽  
Xrd Pattern ◽  
Sic Ceramics ◽  
The Matrix ◽  
Sic Composites ◽  
Load Deflection Curve ◽  
Liquid Vapor

The conversion of the liquid polycabosilane (LPCS) into silicon carbide was investigated by IR, XRD, which indicated the feasibility of the transition from LPCS to SiC ceramics above 900°C. The FTIR spectra and XRD Pattern of the Cf/SiC composites show that the matrix deposited at 1200°C has silicon carbide structure with the crystallite size of β-SiC phase of about 41 nm, while the SiC phase is amorphous at 900°C. The carbon fiber reinforced silicon carbide composites (Cf/SiC) were hereby prepared at 900°C and 1200°C, through chemical liquid-vapor deposition (CLVD) process using LPCS as precursor. Flexural strength of 224 MPa for Cf/SiC specimen with density of 1.81g·cm-3was obtained after being prepared at 1200°C for 30 minutes. The load-deflection curve has shown that the fracture behavior of the Cf/SiC composites is a typical non-brittleness. The results indicate that the CLVD process has a great advantage and prospect to prepare Cf/SiC composites in future.

Preparation and Properties of 2D C/SiC Composites by CLVD Processing

2011 ◽  
Vol 675-677 ◽  
pp. 779-782 ◽  
Author(s):  
Si’an Chen ◽  
Hai Feng Hu ◽  
Chang Rui Zhang ◽  
Yu Di Zhang ◽  
Xin Bo He ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Induction Heating ◽  
Vapor Deposition ◽  
Flexural Modulus ◽  
Fiber Bundles ◽  
Xrd Pattern ◽  
Carbon Fiber Cloth ◽  
The Matrix ◽  
Sic Composites

Chemical liquid-vapor deposition (CLVD) process is a new style of fast densification, which combines the advantages of PIP process and CVI process. 2D C/SiC composites were prepared at 800~1200°C for 3~4 hours with liquid polycarbosilane and carbon fiber cloth by CLVD process with induction heating, and had the density of 1.7 g/cm3, the flexural strength of 84.6MPa, and the flexural modulus of 20GPa. XRD pattern of the sample proved that the matrix was β-SiC. It was found that SiC deposited mainly around single fiber instead of among fiber bundles and layers.

Preparation of C/SiC composites by pulse chemical liquid–vapor deposition process

2012 ◽  
Vol 82 ◽  
pp. 36-38 ◽  
Author(s):  
Min Mei ◽  
Xinbo He ◽  
Xuanhui Qu ◽  
Haifeng Hu ◽  
Yudi Zhang ◽  
...  
Keyword(s):  
Vapor Deposition ◽  
Deposition Process ◽  
Sic Composites ◽  
Vapor Deposition Process ◽  
Liquid Vapor

scholarly journals Effect of Structure on the Thermal-Mechanical Performance of Fully Ceramic Microencapsulated Fuel

Computation ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 13 ◽  
Author(s):  
Yi Zhou ◽  
Zhong Xiao ◽  
Shichao Liu ◽  
Ping Chen ◽  
Hua Pang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Hoop Stress ◽  
Mechanical Performance ◽  
Maximum Temperature ◽  
Sic Ceramics ◽  
Decomposition Point ◽  
The Matrix ◽  
Maximum Hoop Stress ◽  
Triso Particles ◽  
Effect Of Structure

The effect of non-fuel part size on the thermal-mechanical performance of fully ceramic microencapsulated (FCMTM) Fuel was investigated, and the non-fuel part size was selected according to integrity maintaining of non-fuel part and silicon carbide (SiC) layers. The non-fuel part size can affect the FCMTM temperature and stress distribution greatly by changing the distance between tristructural isotropic (TRISO) particles. The maximum temperature of SiC matrix increased from 1220 K to 1450 K with the non-fuel part size increasing from 100 μm to 500 μm, and the matrix temperature of all the samples was lower than the decomposition point of SiC ceramics. The maximum hoop stress decreased with non-fuel part size, but the inner part exhibiteda crosscurrent trend. The inner part of the SiC matrix lost structure integrity because of the large hoop stress caused by the deformation of TRISO particles, however, the non-fuel parts of FCMTM pellet may maintain their integrity when the non-fuel part size was larger than 300 μm. SiC layers hoop stress increased with non-fuel part size, and the failure probability of SiC layer was lower than 2.2 × 10−4 for the FCMTM pellet with small non-fuel part size. The integrity of non-fuel and SiC layers can be maintained for the FCMTM pellet with the non-fuel part size from 300 μm to 400 μm.

Fabrication of Two Dimensional Silicon Carbide Fiber-Reinforced Silicon Carbide Composite by Electrophoretic Deposition and Hot-Pressing

2007 ◽  
Vol 352 ◽  
pp. 77-80 ◽  
Author(s):  
Katsumi Yoshida ◽  
Hideki Matsumoto ◽  
Masamitsu Imai ◽  
Kazuaki Hashimoto ◽  
Yoshitomo Toda ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Electrophoretic Deposition ◽  
Hot Pressing ◽  
Fracture Behavior ◽  
Fiber Volume Fraction ◽  
Bending Strength ◽  
Volume Fraction ◽  
Fiber Volume ◽  
The Difference ◽  
Sic Composites

In this study, Tyranno SA fiber cloth was coated with carbon black and SiC powder containing sintering aids by means of electrophoretic deposition method, and SiC/SiC composites with three different fiber volume fractions were fabricated using the Tyranno SA cloth by hot-pressing at 1700oC. The sufficient formation of the SiC matrix between each fiber could be observed. The composite fractured in non-brittle manner, and bending strength decreased with increasing fiber volume fraction. The crack propagation and fracture behavior depended on the fiber volume fraction. These differences in bending strength and fracture behavior would be caused by the difference in the interfacial bonding between fiber cloth and the matrix.

Preparation of High Performance SiCf/SiC Composites through PIP Process

2013 ◽  
Vol 544 ◽  
pp. 43-47 ◽  
Author(s):  
Ming Wei Chen ◽  
Hai Peng Qiu ◽  
Jian Jiao ◽  
Xiu Qian Li ◽  
Yu Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Carbon Coating ◽  
Fracture Behavior ◽  
Pyrolytic Carbon ◽  
Sic Fiber ◽  
The Matrix ◽  
Sic Composites ◽  
Polymer Impregnation ◽  
External Loads

SiC fiber reinforced SiC matrix (SiCf-SiC) composites with and without pyrolytic carbon interphase were prepared by polymer impregnation pyrolysis (PIP) progress. The effect of pyrolytic carbon interphase on the fracture behavior and mechanical properties of SiCf/SiC composites was studied. The results show that pyrolytic carbon interphase weakened the bonding between the matrix and the fibers. The mechanical properties of SiCf-SiC composites with carbon coating were improved effectively via fiber debonding and pulling-out from matrix under external loads. The flexural strength and fracture toughness of the above composites reached up to 498.52MPa and 24.09MPa•m1/2, respectively.

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