Microstructural control of pitch matrix carbon-carbon composite by iodine treatment

1998 ◽  
Vol 13 (2) ◽  
pp. 302-307 ◽  
Author(s):  
H. Kajiura ◽  
Y. Tanabe ◽  
E. Yasuda ◽  
A. Kaiho ◽  
I. Shiota ◽  
...  
Keyword(s):  
Coal Tar ◽  
Carbon Composite ◽  
Coal Tar Pitch ◽  
Microstructural Development ◽  
Carbon Yield ◽  
Graphitic Structure ◽  
Matrix Microstructure ◽  
Iodine Treatment ◽  
Matrix Precursor ◽  
Microstructural Control

Matrix microstructure of a pitch-based carbon-carbon composite was controlled by an iodine treatment. Coal-tar pitch having the softening point of 101 °C was used as a matrix precursor. The iodine treatment was carried out on a pitch-impregnated specimen at 90 °C for 3–20 h. The specimen was carbonized at 800 °C and graphitized at 2000–3000 °C. The carbon yield increased from 73% to 93% by the iodine treatment. Microstructures of carbonized specimens changed from a flow type texture to a mosaic type one by the iodine treatment. The microstructural development to graphitic structure was suppressed by the iodine treatment.

scholarly journals Study of the phase transition ability of coal tar pitch and their coke products under the influence of temperature used to synthesise carbon composite materials

2021 ◽  
Vol 63 (11) ◽  
pp. 56-59
Author(s):  
The Nam Dao ◽  
◽  
Minh Thanh Vu ◽  
Tuan Anh Doan ◽  
Thi Thao Vu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Coal Tar ◽  
Amorphous State ◽  
Carbon Composite ◽  
Coal Tar Pitch ◽  
Carbon Fabric ◽  
Scanning Calorimetry ◽  
Pitch Sample ◽  
Carbon Composite Material ◽  
Carbon Composite Materials

Using differential scanning calorimetry and thermogravimetric analysis showed the marking temperature of coal tar pitch is 107.8°C. The thermal decomposition of the pitch is divided into three main stages, corresponding to three phases α, β, γ, with a coke yield of 47% at 800°C. The change in the XRD diagram showed a clear transition from the amorphous state of carbon to the highly ordered crystalline structure of graphite after treatment at 2,200 and 2,700°С. The purity of the pitch sample and the structure of the CCC carbon-carbon composite material after heat treatment at 2,700°C were studied using scanning electron microscopy and energy-dispersive X-ray spectroscopy methods. The results showed that after heat treatment, the C content in the sample reached more than 99.5%, and the coke residues after graphitization were bound and connected to the carbon fabric into a mass of graphite material.

Microstructure of Carbon Fiber/Carbon Composites Carbonized under Pressure with Coal-Tar-Pitch as Matrix Precursor

TANSO ◽  
1986 ◽  
Vol 1986 (125) ◽  
pp. 62-68 ◽  
Author(s):  
Shiushichi Kimura ◽  
Eiichi Yasuda ◽  
Kouichi Yasuda ◽  
Yasuhiro Tanabe ◽  
Kazuro Kawamura ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Coal Tar ◽  
Coal Tar Pitch ◽  
Carbon Composites ◽  
Matrix Precursor

Study on the Variety of Rheological Properties and Thermal Analysis of Modified Coal Tar Pitch with 1,4-Benzenedimethanol

2014 ◽  
Vol 602-603 ◽  
pp. 304-307 ◽  
Author(s):  
Wu Chao Shi ◽  
Li Min Dong ◽  
Qiang Li ◽  
Chen Wang ◽  
Tong Xiang Liang
Keyword(s):  
Rheological Properties ◽  
Apparent Viscosity ◽  
Sulfonic Acid ◽  
Carbon Materials ◽  
Coal Tar ◽  
Coaxial Cylinder ◽  
Coal Tar Pitch ◽  
Carbon Yield ◽  
Toluene Sulfonic Acid ◽  
Cylinder Viscometer

Coal tar pitch (CTP) as carbon material was studied using 1,4-Benzenedimethanol (PXG) as modifier by p-toluene sulfonic acid (PTS) catalyst and the variety of rheological properties of modified coal tar pitch (MTP) was discussed. The apparent viscosity of CTP and MTP were measured using rotating coaxial-cylinder viscometer, and the relations between the apparent viscosity and temperature were studied. Thermal behaviors of CTP and MTP were analyzed with TG-DSC. The results showed that the viscosity of the MTP gradually decreased with the temperature rising and the viscous activation energy of the MTP is 72.92 kJ·mol-1, which was beneficial to the process for producing carbon materials and the carbon yield was greatly improved. Therefore, coal tar pitch modified with PXG was qualified to be an excellent carbon precursor.

Effect of iodine treatment on carbonization of coal tar pitch

Carbon ◽  
1996 ◽  
Vol 34 (5) ◽  
pp. 690
Author(s):  
Eiichi Yasuda ◽  
Hisashi Kajiura ◽  
Yasuhiro Tanabe
Keyword(s):  
Coal Tar ◽  
Coal Tar Pitch ◽  
Iodine Treatment

Preparation of Mesophase Pitch from Coal Tar Pitch for C/C Composites

2007 ◽  
Vol 334-335 ◽  
pp. 165-168 ◽  
Author(s):  
Yong Bing Ji ◽  
Tie Hu Li ◽  
Qi Lang Lin ◽  
Chan Ging Fang ◽  
Xiao Xian Wang
Keyword(s):  
Functional Groups ◽  
Coal Tar ◽  
Optical Microscope ◽  
Side Chain ◽  
Coal Tar Pitch ◽  
Mesophase Pitch ◽  
High Carbon ◽  
Carbon Yield ◽  
Chemical Structures ◽  
Xrd Patterns

Mesophase pitch (MPP) has a high carbon yield and excellent graphitizability, compared with commercial coal tar pitch (CTP), which make it suitable for the preparation of C/C composites. In this paper, two MPP were prepared by heat-treatment of two coal tar pitches (CTP and modified coal tar pitch (MCTP)) in the presence of nitrogen. Elemental analysis and FTIR were used to monitor the change of chemical structures of MPP transition from CTP and MCTP. The pyrolysis behaviors of CTP and MCTP were studied by means of thermal analysis (TG and DSC). The morphologies of MPP were inspected by optical microscope. The structures of the MPP were characterized by XRD. The results show that there are more alkyl functional groups existing in CTP and MCTP than in MPP, and MPP has a higher C/H ratio than CTP and MCTP, which indicate MPP formation predominantly polycondense aromatic and release the alkyl functional groups. An endothermic band due to volatilize light compounds around 290 °C, two exothermic peaks at 430°C and 490 °C were characteristic of polymerization reactions, exothermic peaks of MCTP are higher than that of CTP because the former has a higher reaction active for its more alkyl side chain. The optical texture of MPP from CTP is mosaics texture, while from the MCTP is flow domains texture. (002), (101) peaks of graphite occur on XRD patterns, the peaks of MPP from MCTP are higher and narrower than MPP from CTP, which indicates the former is more graphitizability than the latter.

Coal-tar pitch as a matrix precursor for 2-D C/C composites

Carbon ◽  
1996 ◽  
Vol 34 (5) ◽  
pp. 639-644 ◽  
Author(s):  
P.D. Matzinos ◽  
J.W. Patrick ◽  
A. Walker
Keyword(s):  
Coal Tar ◽  
Coal Tar Pitch ◽  
Matrix Precursor

scholarly journals Effect of Iodine Treatment on Carbonization of Coal Tar Pitch

TANSO ◽  
1995 ◽  
Vol 1995 (170) ◽  
pp. 286-289 ◽  
Author(s):  
Eiichi Yasuda ◽  
Hisashi Kajiura ◽  
Yasuhiro Tanabe
Keyword(s):  
Coal Tar ◽  
Coal Tar Pitch ◽  
Iodine Treatment

Microstructural Control and the Properties of C/C Composites

1992 ◽  
Author(s):  
Eiichi Yasuda ◽  
Yasuhiro Tanabe ◽  
Shiushichi Kimura
Keyword(s):  
Heat Treatment ◽  
Carbon Composite ◽  
Preparation Condition ◽  
Treatment Temperature ◽  
Raw Material ◽  
Composite Matrix ◽  
Fine Powders ◽  
Matrix Microstructure ◽  
The Matrix ◽  
Microstructural Control

A Carbon/Carbon composite (C/C composite) consists of reinforced fibers, matrices and interfaces. Each of them plays an important role to dominate the properties of the C/C composite. Matrix microstructure of a C/C composite can be changed during its preparation, i.e., by its preparation condition. In this paper, we discuss methods for changing matrix microstructure of a C/C composite and the dependency on its properties: Young’s modulus, strength and thermal conductivity. The matrix microstructure depends primarily on the initial raw material (precursor) of the matrix. Secondary, it depends on the heat-treatment temperature. It also can be controlled by addition of fine powders and surface-treatment on fibers. All the properties measured strongly depend on the matrix microstructure of the C/C composite. To make a tailored C/C composite, it is necessary to control the matrix microstructure precisely.

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