Development of mesophase pitch derived high thermal conductivity graphite foam using a template method

Carbon ◽  
2011 ◽  
Vol 49 (11) ◽  
pp. 3622-3630 ◽  
Author(s):  
Abhay Yadav ◽  
Rajeev Kumar ◽  
Gopal Bhatia ◽  
G.L. Verma
Keyword(s):  
Thermal Conductivity ◽  
High Thermal Conductivity ◽  
Template Method ◽  
Mesophase Pitch ◽  
Graphite Foam

Thermal Properties of Graphite Foam: Experiments and Modeling

Volume 1 ◽  
2004 ◽  
Author(s):  
N. Yu ◽  
C. C. Tee ◽  
H. Li
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Mesophase Pitch ◽  
Cooling Fluid ◽  
Open Cell ◽  
Manufacturing Technique ◽  
Fluid Properties ◽  
Transfer Properties ◽  
Graphite Foam

Mesophase pitch-derived open-cell graphite foams with excellent heat transfer properties have been developed by using a relatively simple manufacturing technique [1]. The specific thermal conductivity of the graphite foam is more than seven times greater than that of copper and six times greater than that of aluminum. The present work focuses on the interactions between the effective heat transfer properties and foam microstructure, temperature, and cooling fluid properties.

Microstructure of high thermal conductivity mesophase pitch-based carbon fibers

2021 ◽  
Vol 36 (5) ◽  
pp. 980-985
Author(s):  
Chong Ye ◽  
Huang Wu ◽  
Shi-peng Zhu ◽  
Zhen Fan ◽  
Dong Huang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fibers ◽  
High Thermal Conductivity ◽  
Mesophase Pitch

An electron microscopy study of high-thermal-conductivity ribbon-shape carbon fibers

1993 ◽  
Vol 51 ◽  
pp. 618-619
Author(s):  
Kerry E. Robinson
Keyword(s):  
Electron Microscopy ◽  
Thermal Conductivity ◽  
Liquid Crystalline ◽  
Structural Information ◽  
Low Cost ◽  
Microscopy Study ◽  
High Thermal Conductivity ◽  
Mesophase Pitch ◽  
Thermal Conductivities ◽  
Shaped Fibers

In an effort to develop a low-cost high thermal conductivity carbon fiber, ribbon-shaped fibers were meltspun from a liquid crystalline, mesophase pitch precursor. Initial tests indicated that the ribbon-shaped fibers could be processed more easily and exhibited improved thermal conductivities when compared to commercial round fibers. Evidently, it is the more linear, polycrystalline structure within these fibers that accounts for their improved thermal conductivities. Thus, studies using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were conducted to fully analyze the transverse and longitudinal structure of these high thermal conductivity fibers.Ribbon-shaped fibers, melt-spun from a synthetic mesophase pitch and then heat treated, were tested to determine their tensile strengths, tensile moduli and thermal conductivities. A Jeol JSM-I C848 SEM at an accelerating voltage of 20 kV was used to obtain general structural information, such as extent and texture of lamellar organization of the graphitic layers within the fibers, and the microstructure of the fibers was studied by TEM.

Carbon Foam with High Strength and High Thermal Conductivity Doped by Nano-Titanium

2008 ◽  
Vol 47-50 ◽  
pp. 566-569
Author(s):  
Yong Wang ◽  
Ling Ling Cao ◽  
Yi Min Wang
Keyword(s):  
Thermal Conductivity ◽  
Cell Walls ◽  
High Strength ◽  
Carbon Foam ◽  
High Thermal Conductivity ◽  
Mesophase Pitch ◽  
Test Results ◽  
Titanium Concentration ◽  
Titanium Particle ◽  
Scanning Electron

A carbon foam with high strength and high thermal conductivity was prepared through the incorporation of nano-titanium particle into mesophase pitch precursor. Results show that titanium act as catalysts to accelerate the graphitization of carbon, promote more perfect and larger crystallites and enhance the conductive and mechanical properties. Test results reveal that titanium doped carbon foam (TDCF) has excellent compressive strength and high thermal conductivity, with highest values reaching 29.6 MPa and 117.8 Wm-1 K-1 for a titanium concentration of 12 wt% in the precursor materials. More compact struts and cell walls stacked by more uniform were observed by scanning electron microscope in carbon foam. Correlation between the content of dopant and the properties and microstructure of TDCF was discussed.

scholarly journals Microstructure of high thermal conductivity mesophase pitch-based carbon fibers

Carbon ◽  
2022 ◽  
Vol 186 ◽  
pp. 738-739
Author(s):  
Chong Ye ◽  
Huang Wu ◽  
Shi-peng Zhu ◽  
Zhen Fan ◽  
Dong Huang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fibers ◽  
High Thermal Conductivity ◽  
Mesophase Pitch

High Strength and High Thermal Conductivity Carbon Foam Reinforced with Graphite Nanoparticles

2007 ◽  
Vol 26 (5) ◽  
pp. 305-312 ◽  
Author(s):  
Yong Wang ◽  
Zhi Xu ◽  
Qingqing An ◽  
Yimin Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
High Pressure ◽  
Coal Tar ◽  
High Strength ◽  
Carbon Foam ◽  
High Thermal Conductivity ◽  
Mesophase Pitch ◽  
High Pressure And Temperature ◽  
Graphite Nanoparticles

A novel carbon foam with high strength and high thermal conductivity was prepared through the incorporation of graphite nanoparticles into coal tar based mesophase pitch precursor. Carbon foam was obtained after carbonization and graphitication of pitch foam formed by the pyrolysis of coal tar based mesophase pitch mixed with graphite nanoparticles in a high pressure and temperature chamber. The foam had possessed high strength and exceptional high thermal conductivity. SEM observation showed that less micro cracking appeared on the cell wall of foam by the addition of graphite nanoparticles. The test of thermal conductivity and mechanical properties shows that the thermal conductivity of modified carbon foam could reach 195 W/m.K. The mechanical properties were improved markedly, and compressive strength was increased from 2 MPa to 18.8 MPa when the additive amount of graphite nanoparticles was 8%.

High-thermal-conductivity, mesophase-pitch-derived carbon foams: effect of precursor on structure and properties

Carbon ◽  
2000 ◽  
Vol 38 (7) ◽  
pp. 953-973 ◽  
Author(s):  
James Klett ◽  
Rommie Hardy ◽  
Ernie Romine ◽  
Claudia Walls ◽  
Tim Burchell
Keyword(s):  
Thermal Conductivity ◽  
High Thermal Conductivity ◽  
Mesophase Pitch ◽  
Structure And Properties ◽  
Carbon Foams

A Vapor Chamber Using Graphite Foams as Wicks for Cooling High Heat Flux Electronics

2005 ◽  
Author(s):  
Minhua Lu ◽  
Larry Mok ◽  
R. J. Bezama
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
High Heat ◽  
High Thermal Conductivity ◽  
Working Fluid ◽  
High Heat Flux ◽  
Vapor Chamber ◽  
Capillary Limit ◽  
Wick Structure ◽  
Graphite Foam

A vapor chamber using high thermal conductivity and permeability graphite foam as a wick has been designed, built and tested. With ethanol as the working fluid, the vapor chamber has been demonstrated at a heat flux of 80 W/cm2. The effects of the capillary limit, the boiling limit, and the thermal resistance in restricting the overall performance of a vapor chamber have been analyzed. Because of the high thermal conductivity of the graphite foams, the modeling results show that the performance of a vapor chamber using a graphite foam is about twice that of one using a copper wick structure. Furthermore, if water is used as the working fluid instead of ethanol, the performance of the vapor chamber will be increased further. Graphite foam vapor chambers with water as the working fluid can be made by treating the graphite foam with an oxygen plasma to improve the wetting of the graphite by the water.

A Graphite Foams Based Vapor Chamber for Chip Heat Spreading

2005 ◽  
Vol 128 (4) ◽  
pp. 427-431 ◽  
Author(s):  
Minhua Lu ◽  
Larry Mok ◽  
R. J. Bezama
Keyword(s):  
Thermal Conductivity ◽  
Oxygen Plasma ◽  
High Thermal Conductivity ◽  
Working Fluid ◽  
Vapor Chamber ◽  
Capillary Limit ◽  
Wick Structure ◽  
Overall Performance ◽  
Heat Spreading ◽  
Graphite Foam

A vapor chamber using high thermal conductivity and permeability graphite foam as a wick has been designed, built, and tested. With ethanol as the working fluid, the vapor chamber has been demonstrated at a heat flux of 80W∕cm2. The effects of the capillary limit, the boiling limit, and the thermal resistance in restricting the overall performance of a vapor chamber have been analyzed. Because of the high thermal conductivity of the graphite foams, the modeling results show that the performance of a vapor chamber using a graphite foam is about twice that of one using a copper wick structure. Furthermore, if water is used as the working fluid instead of ethanol, the performance of the vapor chamber will be increased further. Graphite foam vapor chambers with water as the working fluid can be made by treating the graphite foam with an oxygen plasma to improve the wetting of the graphite by the water.

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