scholarly journals One-Step Densification of Carbon/Carbon Composites Impregnated with Pyrolysis Fuel Oil-Derived Mesophase Binder Pitches

2020 ◽  
Vol 6 (1) ◽  
pp. 5
Author(s):  
Jae-Yeon Yang ◽  
Jong-Hyun Park ◽  
Yun-Su Kuk ◽  
Byoung-Suhk Kim ◽  
Min-Kang Seo
Keyword(s):  
Mechanical Properties ◽  
Chemical Vapor ◽  
High Viscosity ◽  
Chemical Vapor Infiltration ◽  
Fuel Oil ◽  
Carbon Composites ◽  
Phenolic Resins ◽  
Mesophase Formation ◽  
Pyrolysis Fuel Oil ◽  
One Step

Carbon/carbon (C/C) composites are conventionally manufactured by liquid-phase impregnation (LPI), in which the binder pitches and phenolic resins are impregnated into the composites, and by chemical vapor infiltration (CVI). However, CVI has certain limitations in that expensive gases, such as methane and propane, are used and a long reaction time is required. Therefore, LPI is more widely used, as it employs economical pitches. In this study, the effects of one-step preparation on mechanical properties of C/C composites impregnated with mesophase binder pitches and phenolic resins have been investigated. The C/C composites containing four types of 20 wt.% mesophase binder pitches had differences in softening point (SP) and quinoline insoluble (QI) contents. After conducting trials on mesophase formation using different heat treatment temperatures and times, the best density and mechanical properties of the C/C composites were achieved using the mesophase binder pitches with 170 °C SP. However, when SP 200 °C was used, the density of the C/C composites was not further improved. This is because the binder pitches were not properly impregnated into the composites due to the high viscosity and QI of the binder pitches. Furthermore, the C/C composites fabricated with 20 wt.% pitch 2 exhibited the highest mechanical properties.

Preparation and characterization of mesophase formation of pyrolysis fuel oil-derived binder pitches for carbon composites

2019 ◽  
Vol 165 ◽  
pp. 467-472 ◽  
Author(s):  
Jae-Yeon Yang ◽  
Byoung-Suhk Kim ◽  
Soo-Jin Park ◽  
Kyong Yop Rhee ◽  
Min-Kang Seo
Keyword(s):  
Fuel Oil ◽  
Carbon Composites ◽  
Mesophase Formation ◽  
Pyrolysis Fuel Oil

Microstructures and Mechanical Properties of Zirconium Dioxide Modified Carbon/Carbon Composites

2015 ◽  
Vol 1120-1121 ◽  
pp. 599-603
Author(s):  
Zhao Qian Li ◽  
Bo Hua Nan ◽  
Guan Xiang Feng ◽  
Dong Dong Hao
Keyword(s):  
Mechanical Properties ◽  
Zirconium Dioxide ◽  
Bending Strength ◽  
Sol Gel ◽  
Chemical Vapor ◽  
Carbon Matrix ◽  
Chemical Vapor Infiltration ◽  
Carbon Composites ◽  
Microstructures And Mechanical Properties ◽  
The Cost

To improve the preparation technology and mechanical properties of carbon/carbon composites, a kind of Zirconium dioxide modified Carbon/carbon (C/C–ZrO2) composites were prepared by Sol-Gel Process combined with isothermal chemical vapor infiltration (ICVI) method. This method could shorten preparation cycle greatly to reduce the cost. The microstructures and mechanical properties of the C/C–ZrO2 composites were investigated. The results indicate that the ZrO2 modified phase is uniformly distributed in the carbon matrix, the bending strength and modulus of C/C–ZrO2 composites are much higher than unmodified C/C composites due to its particle toughening and fiber toughening.

Characterization of interfaces in CVD-coated nicalon fiber-reinforced SiC

1989 ◽  
Vol 47 ◽  
pp. 556-557
Author(s):  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Pull Out ◽  
Carbon Coated ◽  
Fiber Matrix

The mechanical properties of fiber-reinforced composites are directly related to the nature of the fiber-matrix bond. Fracture toughness is improved when debonding, crack deflection, and fiber pull-out occur which in turn depend on a weak interfacial bond. The interfacial characteristics of fiber-reinforced ceramics can be altered by applying thin coatings to the fibers prior to composite fabrication. In a previous study, Lowden and co-workers coated Nicalon fibers (Nippon Carbon Company) with silicon and carbon prior to chemical vapor infiltration with SiC and determined the influence of interfacial frictional stress on fracture phenomena. They found that the silicon-coated Nicalon fiber-reinforced SiC had low flexure strengths and brittle fracture whereas the composites containing carbon coated fibers exhibited improved strength and fracture toughness. In this study, coatings of boron or BN were applied to Nicalon fibers via chemical vapor deposition (CVD) and the fibers were subsequently incorporated in a SiC matrix. The fiber-matrix interfaces were characterized using transmission and scanning electron microscopy (TEM and SEM). Mechanical properties were determined and compared to those obtained for uncoated Nicalon fiber-reinforced SiC.

MECHANICAL PROPERTIES PREDICTION OF PHENOLIC RESIN: A MOLECULAR DYNAMICS STUDY

2021 ◽  
Author(s):  
IVAN GALLEGOS ◽  
JOSHUA KEMPPAINEN ◽  
SAGAR U. PATIL ◽  
PRATHAMESH DESHPANDE ◽  
JACOB GISSINER ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Phenolic Resin ◽  
Mass Density ◽  
Carbon Composites ◽  
Mechanical And Thermal Properties ◽  
Phenolic Resins ◽  
Suitable Candidate ◽  
Mechanical Properties Prediction ◽  
Experimental Values

Carbon-carbon composites (CCCs) widely used in the aerospace and automotive industries due to their excellent mechanical and thermal properties. Phenolic resins have a relatively high carbon yield, which makes them a suitable candidate for CCCs manufacturing. Molecular Dynamics (MD) can further reduce costs by predicting properties of a material before manufacturing and testing. In the present work, a Molecular Dynamics (MD) model of a crosslinked phenolic resin was developed to predict mechanical properties by implementing the fix bond/react algorithm in LAMMPS. The predicted mass density (ρ) and Young’s Modulus (E) agree well with experimental values and highlights the validity of the topologybased approach to building stable molecular models of phenolic resins.

Microwave assisted chemical vapor infiltration for the rapid fabrication of carbon/carbon composites

Carbon ◽  
2009 ◽  
Vol 47 (8) ◽  
pp. 2144
Author(s):  
Xie-Rong Zeng ◽  
Ji-Zhao Zou ◽  
Hai-Xia Qian ◽  
Xin-Bo Xiong ◽  
Xiao-Hua Li ◽  
...  
Keyword(s):  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Carbon Composites ◽  
Microwave Assisted ◽  
Rapid Fabrication ◽  
Vapor Infiltration
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