scholarly journals Effect of pyrolytic carbon interphase on mechanical properties of mini T800-C/SiC composites

2021 ◽  
Author(s):  
Donglin Zhao ◽  
Tong Guo ◽  
Xiaomeng Fan ◽  
Chao Chen ◽  
Yue Ma
Keyword(s):  
Mechanical Properties ◽  
Weibull Modulus ◽  
Chemical Vapor ◽  
Pyrolytic Carbon ◽  
Chemical Vapor Infiltration ◽  
Matrix Composites ◽  
Average Strength ◽  
Gas Source ◽  
Maximum Value ◽  
Sic Composites

AbstractThe effect of pyrolytic carbon (PyC) thickness on the tensile property of mini T800 carbon fiber reinforced SiC matrix composites (C/SiC) was studied. PyC interphase was prepared by chemical vapor infiltration (CVI) process using C3H6–Ar as gas source, the PyC thickness was adjusted from 0 to 400 nm, and then the SiC matrix was prepared by CVI process using methyltrichlorosilane (MTS)–H2–Ar as precursor and gas source. The results showed that the tensile strength of mini T800-C/SiC increased first and then decreased with the increase of the PyC thickness. When the thickness of PyC was 100 nm, the average strength reached the maximum value of 393 ± 70 MPa. The Weibull modulus increased from 2.0 to 8.06 with the increase of PyC thickness, and the larger the Weibull modulus, the smaller the dispersion, which indicated that the regulation of PyC thickness was conducive to improve tensile properties.

scholarly journals Effect of Pyrolytic Carbon Interphase on Mechanical Properties of mini T800-C/SiC Composites

2020 ◽  
Author(s):  
Donglin Zhao ◽  
Tong Guo ◽  
X.M. Fan ◽  
Chao Chen ◽  
Yue Ma
Keyword(s):  
Mechanical Properties ◽  
Weibull Modulus ◽  
Chemical Vapor ◽  
Pyrolytic Carbon ◽  
Chemical Vapor Infiltration ◽  
Matrix Composites ◽  
Average Strength ◽  
Gas Source ◽  
Maximum Value ◽  
Sic Composites

Abstract The effect of pyrolytic carbon (PyC) thickness on the tensile property of mini T800-carbon fiber reinforced SiC matrix composites (mini-C/SiC) was studied in this work. PyC interphase was prepared by chemical vapor infiltration (CVI) process using C3H6-Ar as gas source, and the PyC thickness was adjusted from 0 to 400 nm, then the SiC matrix was prepared by CVI process using methyltrichlorosilane (MTS)-H2-Ar as precursor and gas source. The results showed that the tensile strength of mini-C/SiC increased first and then decreased with the increase of the PyC thickness. When the thickness of PyC was 100 nm, the average strength reached the maximum value of 393±70 MPa. The Weibull modulus increased from 2.0 to 8.06 with the increase of PyC thickness, the larger the Weibull modulus, the smaller the dispersion, which indicated that the regulation of PyC thickness is conducive to improve tensile properties.

scholarly journals Effect of Pyrolytic Carbon Interphase on Mechanical Properties of mini T800-C/SiC Composites

2020 ◽  
Author(s):  
Donglin Zhao ◽  
Tong Guo ◽  
X.M. Fan ◽  
Chao Chen ◽  
Yue Ma
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Carbon Fiber ◽  
Tensile Property ◽  
Weibull Modulus ◽  
Pyrolytic Carbon ◽  
Matrix Composites ◽  
Average Strength ◽  
Maximum Value ◽  
Sic Composites

Abstract The effect of pyrolytic carbon (PyC) thickness on the tensile property of mini T800-carbon fiber reinforced SiC matrix composites (mini-C/SiC) was studied in this work. PyC interphase was prepared by CVI process, and the PyC thickness was adjusted from 0 to 400 nm. The results showed that the tensile strength of mini-C/SiC first increased and then decreased with the increase of the PyC thickness. When the thickness of PyC was 100 nm, the average strength reached the maximum value of 393±70 MPa. Weibull modulus increased from 2.0 to 8.06 with the increase of PyC thickness, indicating that the increase of PyC thickness is conducive to reducing the dispersion of mechanical properties.

Fabrication and Characteristics of Carbon Fiber Reinforced C–SiC Dual Matrix Composites

2007 ◽  
Vol 334-335 ◽  
pp. 145-148 ◽  
Author(s):  
Dong Mei Zhu ◽  
Fa Luo ◽  
Hong Na Du ◽  
Wan Cheng Zhou
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Final Density ◽  
Carbon Fiber Reinforced ◽  
Sic Composites ◽  
Xylene Solution

A series of carbon fiber reinforced C-SiC dual matrix composites (C/C-SiC composites) were developed through precursor infiltration of polycarbosilane (PCS) and pyrolysis (PIP), using porous C/C composites with different density from chemical vapor infiltration (CVI) as the preform. The density, mechanical properties, and microstructure of the composites were investigated and the effects of the preform density and the PCS concentration of the infiltration solution on the final density and the mechanical properties of the composites were discussed in detail. The results show that the final density of the C/C-SiC composites prepared at the infiltration concentration of 50% is the highest, indicating that 50% is the proper PCS concentration of the PCS/ Xylene solution to prepare the C/C-SiC composites. The final densities of C/C-SiC composites were closely related to the preform density and the highest final density corresponds to the highest original preform density. For the composites prepared using infiltration solution of 50% PCS, the C/C-SiC composite whose preform density is 1.23 g/cm3 possesses the best mechanical properties while that whose preform density is 1.49 g/cm3 the worst mechanical properties.

The Stability of BN Interfacial Coatings in CFCC Systems During Oxidation and Exposure to Moisture

1997 ◽  
Vol 3 (S2) ◽  
pp. 729-730
Author(s):  
K.S. Ailey ◽  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Elevated Temperatures ◽  
Impurity Content ◽  
Chemical Vapor ◽  
Ceramic Matrix Composites ◽  
Chemical Vapor Infiltration ◽  
Forced Flow ◽  
Crystallographic Structure ◽  
Matrix Composites ◽  
Sic Composites ◽  
The Stability

The mechanical reliability of ceramic matrix composites (CMCs) at elevated temperatures in oxidative environments is primarily dependent upon the chemical and structural stability of the fiber/matrix interface. Graphitic carbon coatings have traditionally been used to control the interfacial properties in CMCs, however, their use is limited in high temperature oxidative environments due to the loss of carbon and subsequent oxidation of the fiber and matrix. Thus, BN is being investigated as an alternative interfacial coating since it has comparable room temperature properties to carbon with improved oxidation resistance. The stability of BN interfaces in SiC/SiC composites is being investigated at elevated temperatures in either flowing oxygen or environments containing water vapor. The effect of several factors on BN stability, including crystallographic structure, extent of BN crystallization, and impurity content, are being evaluated.Nicalon™ fiber preforms were coated with ≈ 0.4 μm of BN by CVD using BCl3, NH3, and H2 at 1373 K. The coated preforms were densified using a forced-flow chemical vapor infiltration (FCVI) technique developed at ORNL.

Microstructure, mechanical properties and oxidation resistance of SiCf/SiC composites incorporated with boron nitride nanotubes

RSC Advances ◽  
2016 ◽  
Vol 6 (86) ◽  
pp. 83482-83492 ◽  
Author(s):  
Guangxiang Zhu ◽  
Shaoming Dong ◽  
Dewei Ni ◽  
Chengying Xu ◽  
Dengke Wang
Keyword(s):  
Mechanical Properties ◽  
Chemical Vapor ◽  
Boron Nitride Nanotubes ◽  
Chemical Vapor Infiltration ◽  
Raw Material ◽  
Boron Powder ◽  
Hierarchical Composites ◽  
Sic Composites ◽  
Polymer Impregnation

SiCf/BNNTs–SiC hierarchical composites were fabricated via firstly in situ growth of BNNTs on SiC fibers using boron powder as a raw material and then matrix densification by chemical vapor infiltration and polymer impregnation/pyrolysis methods.

scholarly journals Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

2020 ◽  
Author(s):  
Jing Wang ◽  
Liyang Cao ◽  
Yunhai Zhang ◽  
Yongsheng Liu ◽  
Hui Fang ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Chemical Vapor ◽  
Ceramic Matrix Composites ◽  
Strengthening Mechanism ◽  
Chemical Vapor Infiltration ◽  
Matrix Composites ◽  
Transfer Channel ◽  
Dense Band ◽  
Sic Composites ◽  
Transfer Channels

Abstract In this work, femtosecond laser assisted-chemical vapor infiltration (LA-CVI) was employed to produce C/SiC composites with 1, 3, and 5 rows of mass transfer channels. The effects of laser machining power on the quality of produced holes were investigated. The results showed that the increase in power yielded complete hole structures. The as-obtained C/SiC composites with different mass transfer channels displayed higher densification degrees with flexural strengths reaching 546±15 MPa for row mass transfer channel of 3. The strengthening mechanism of the composites was linked to the increase in densification and formation of “dense band” during LA-CVI process. Multiphysics finite element simulations of the dense band and density gradient of LA-CVI C/SiC composites revealed C/SiC composites with improved densification and lower porosity due to the formation of “dense band” during LA-CVI process. In sum, LA-CVI method looks promising for future preparation of ceramic matrix composites with high densities.

scholarly journals Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

2021 ◽  
Vol 10 (2) ◽  
pp. 227-236
Author(s):  
Jing Wang ◽  
Liyang Cao ◽  
Yunhai Zhang ◽  
Yongsheng Liu ◽  
Hui Fang ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Femtosecond Laser ◽  
Chemical Vapor ◽  
Ceramic Matrix Composites ◽  
Strengthening Mechanism ◽  
Chemical Vapor Infiltration ◽  
Matrix Composites ◽  
Dense Band ◽  
Sic Composites ◽  
Transfer Channels

AbstractIn this study, femtosecond laser assisted-chemical vapor infiltration (LA-CVI) was employed to produce C/SiC composites with 1, 3, and 5 rows of mass transfer channels. The effect of laser machining power on the quality of produced holes was investigated. The results showed that the increase in power yielded complete hole structures. The as-obtained C/SiC composites with different mass transfer channels displayed higher densification degrees with flexural strengths reaching 546 ± 15 MPa for row mass transfer channel of 3. The strengthening mechanism of the composites was linked to the increase in densification and formation of “dense band” during LA-CVI process. Multiphysics finite element simulations of the dense band and density gradient of LA-CVI C/SiC composites revealed C/SiC composites with improved densification and lower porosity due to the formation of “dense band” during LA-CVI process. In sum, LA-CVI method is promising for future preparation of ceramic matrix composites with high densities.

Microstructure and Mechanical Property of 3D Textile C/SiC Composites Fabricated by Chemical Vapor Infiltration

2006 ◽  
Vol 11-12 ◽  
pp. 81-84 ◽  
Author(s):  
Dong Lin Zhao ◽  
Hong Feng Yin ◽  
Fa Luo ◽  
Wan Cheng Zhou
Keyword(s):  
Mechanical Property ◽  
Silicon Carbide ◽  
Carbon Fiber ◽  
Interfacial Layer ◽  
Chemical Vapor ◽  
Pyrolytic Carbon ◽  
Chemical Vapor Infiltration ◽  
Sic Composites ◽  
Microstructure And Mechanical Property ◽  
Vapor Infiltration

Three dimensional textile carbon fiber reinforced silicon carbide (3D textile C/SiC) composites with pyrolytic carbon interfacial layer were fabricated by chemical vapor infiltration. The microstructure and mechanical property of 3D textile C/SiC composites were investigated. A thin pyrolysis carbon layer (0.2 ± μm) was firstly deposited on the surface of carbon fiber as the interfacial layer with C3H6 at 850°C and 0.1 MPa. Methyltrichlorosilane (CH3SiCl3 or MTS) was used for the deposition of the silicon carbide matrix. The conditions used for SiC deposition were 1100°C, a hydrogen to MTS ratio of 10 and a pressure of 0.1 MPa. The density of the composites was 2.1 g cm-3. The flexural strength of the 3D textile C/SiC composites was 438 MPa. The 3D textile C/SiC composites with pyrolytic carbon interfacial layer exhibit good mechanical properties and a typical failure behavior involving fibers pull-out and brittle fracture of sub-bundle. The real part (ε′) and imaginary part (ε″) of the complex permittivity of the 3D-C/SiC composites are 51.53-52.44 and 41.18-42.08 respectively in the frequency range from 8.2 to 12.4 GHz. The 3D-C/SiC composites would be a good candidate for microwave absorber.

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