Effect of titanium carbide coating on the microstructure and thermal conductivity of short graphite fiber/copper composites

Liu, Qian; He, Xinbo; Ren, Shan; Liu, Tingting; Kang, Qiping; Qu, Xuanhui

doi:10.1007/s10853-013-7373-y

Cited by 31 publications

(16 citation statements)

References 19 publications

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“…Thermal properties of Gr f /Al composites In order to evaluate the TC of Gr f /Al composites, the Maxwell-Garnett EMA was applied, which proved to be accurate for TC predictions of anistropic composites with short fiber reinforcements [27,28]. It could be expressed by the following equations: …”

Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

“…Nevertheless, it is hard to have an accurate description for the fiber distribution. For simplicity, fiber alignment distribution in all samples is assumed to fit a uniform distribution in this study, i.e., q(h) = 1, hcos 2 hi = 0.083, which has been reported as reasonable [28]. K e 11 and K e 33 are, respectively, the transversal and longitudinal equivalent TCs of fiber reinforcement in which the Kaptiza interfacial thermal resistance (R k ) is taken into account.…”

Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

“…However, the region of interfacial roughness on a microscopic level may effectively take a weighted-average crystallographic direction for energy propagation across the interface [29]. Thus, it is reasonable to assume a weighted-average phonon velocity of Gr f and a constant value of R k between the Gr f and aluminum matrix for simplified calculation [28]. In this case, K e 11 and K e 33 can be expressed as [30] K e 11 ¼ However, for the Cr 7 C 3 -coated Gr f /Al composites in which the interfacial structure includes three layers of reinforcement/coating interface, coating layer, and coating/matrix interface, the additional thermal resistance should be considered.…”

Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

“…This can be explained by the fact that the enhancement in TC due to the addition of Gr f is comprised by the much lower TC of Gr f in the transverse direction (10 W m -1 K -1 ). When heat flow travels along the fiber transversal direction, the fiber is more like a heat blocker in the matrix, and thus the major factor that influences the TCs in Z direction of the composites is not the interfacial thermal resistance, but the low TC of Gr f in transversal direction [28]. Therefore, in order to improve the TC of Gr f /Al composite, the Cr 7 C 3 layer thickness should be strictly controlled.…”

Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

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Effect of chromium carbide coating on thermal properties of short graphite fiber/Al composites

Liu

et al. 2014

J Mater Sci

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A chromium carbide coating was synthesized onto graphite fibers by molten salts method to improve the interfacial bonding and thermal properties of short graphite fiber/Al composites which were fabricated by vacuum pressure infiltration technique. The graphite fiber/Al composites with different thicknesses of chromium carbide coatings were prepared through varying plating times to investigate the influence of chromium carbide layer on the microstructures and thermal properties of the composites. The combined Maxwell-Garnett effective medium approach and acoustic mismatch model schemes were used to theoretically predict thermal conductivities of the composites. The results indicated that the chromium carbide coating formed on graphite fiber surface in molten salts consists mainly of the Cr 7 C 3 phase. The Cr 7 C 3 -coating layer with plating time of 60 min and thickness of 0.5 lm was found to be most effective in improving the interfacial bonding and decreasing the interfacial thermal resistance between graphite fiber and aluminum matrix. The 40 vol% Cr 7 C 3 -coated graphite fiber/Al composite with Cr 7 C 3 thickness of 0.5 lm exhibited 45.4 % enhancement in inplane thermal conductivity of 221 W m -1 K -1 compared to that of uncoated composite, as well as the coefficient of thermal expansion of 9.4 9 10 -6 K -1 , which made it as very interesting material for thermal management applications.

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Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

Section: Microstructure Of Gr F /Al Compositesmentioning

confidence: 99%

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Effect of chromium carbide coating on thermal properties of short graphite fiber/Al composites

Liu

et al. 2014

J Mater Sci

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“…The Maxwell -Garnett-type effective medium approach was applied to evaluate the TCs of Grf/Cu composites. The effective TCs perpendicular to the pressing direction, Kxy, and parallel to the pressing direction, KZ, of the composite can be expressed as [10,11] where f is the volume fraction of the Grf; m K is the thermal conductivity of metal matrix; 11 L and 33 L are the geometrical factors, when aspect ratio p ( / L d ) 10 the value of 11 L =0.5 , and 33 L =0; 2 cos is a fiber orientation function, based on the assumption that fibers are uniform distributed in the matrix. is the angle between Z direction and the axis of the fiber symmetric [12].…”

Section: Table 1 Measured Thermophysical Properties For Gr/cu Compositesmentioning

confidence: 99%

Fabrication and thermophysical properties of short graphite fiber/Cu composites with Mo<inf>2</inf>C coating by vacuum pressure infiltration

Zhang¹,

He²,

Liu³

2014

2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction M

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High-performance mesophase pitch-based graphite fiber reinforced metal matrix composites offer a good thermal conductivity and tailorable coefficient of thermal expansion. These composites are regarded as a promising heat dissipation materials for electronic packaging application.It is reported that short graphite fiber/Al composites were fabricated by vacuum pressure infiltration, which is a suitable procedure for the fabrication of complex shaped components at high production rates and low cost. The thermal conductivity of short fiber/Al composites is lower than 230 W m -1 K -1 .It is expected that the composites using copper as the matrix, which has a higher thermal conductivity and lower coefficient of thermal expansion than aluminum, may have a better thermal properties. However, there is few investigation on fabrication of graphite fiber/Cu composites since copper does not wet graphite. This work focuses on the fabrication of short graphite fiber/Cu composites for thermal management application by vacuum pressure infiltration technique.A Mo2C coating was synthesized on the surface of graphite fiber through molten salts method for improving the wetting between graphite fibers and copper. Certain Grfs reacted with molybdenum oxides powders in a molten salts mixture composed of NaCl-KCl at 1000 for 30 min under a flowing argon atmosphere. The obtained coating is compact and homogenous with the thickness of 0.3 m. Copper was infiltrated into Mo2C-coated graphite preform at 1150with low pressure and Cu matrix composites with 20 vol% -40 vol% fibers were fabricated. Due to the unidirectional compression in the perform and infiltration process, the fibers were uniform distribution in the plane perpendicular to the press direction (X-Y plane) and showed a two dimensional orientation. The interface of composites was examined by EDS line-scan. Results show that there was copper infiltrated into the Mo2C interlayer. A good adhesion was observed in composites in which the Mo2C interlayer tightly adhered to both fiber and Cu matrix.The obtained composites present high relative density above 99.5%. With increasing volume fraction of fiber from 20% to 40%, the thermal conductivity of composites in X-Y plane slightly decreased from 356 W m -1 K -1 to 311 W m -1 K -1 . The coefficient of thermal expansion in X-Y plane decreased from 14× 10 -6 to 7 × 10 -6 K -1 . The experimental values of thermal conductivities of composites were compared with the theoretical calculation. With the introduction of Mo2C interlayer, the interface thermal conductance of graphite fiber/Mo2C interlayer/copper matrix had to be taken into consideration. So the effective thermal conductivity of coated fiber was firstly calculated by using the acoustic mismatch model (AMM). Then, a model of Maxwell-Garnett effective medium approach on the anisotropic short fiber reinforcement was used to estimate the thermal conductivity of composites. The result showed that the theoretical predictions are in good agreement with the experimental values. The thermal c...

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Preparation and Thermal Conductivity of Spark Plasma Sintered Aluminum Matrix Composites Reinforced with Titanium‐Coated Graphite Fibers

Liu

et al. 2014

Adv Eng Mater

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Short graphite fiber/Al composites are fabricated by spark plasma sintering technique. A titanium coating synthesized on the graphite fiber surface through vacuum microdeposition is proposed to improve the interfacial bonding between graphite fibers and aluminum matrix. The influences of surface modification, sintering temperature, and graphite fiber volume fraction on relative density and thermal conductivity (TC) of the composites are systematically investigated. The results indicate that compared to uncoated graphite fiber/Al composites, the densification, interfacial bonding, and TC of titanium-coated composites are greatly enhanced. The in-plane TC of 50 vol% titanium-coated graphite fiber/Al composites sintered at 610°C is 238 W m À1 K À1 , nearly twice as high as that of uncoated composites. From the calculation based on the experimental TC by Maxwell-Garnett effective medium approach, the interfacial thermal resistance is evidently decreased by above 1 order of magnitude with the introduction of titanium nanolayer. Fig. 5. FE-SEM images of the interface and XRD patterns of (a and d) uncoated; (b and e) Ti-coated Gr f /Al composite; (c) element line distributions at the interface of Ti-coated Gr f /Al composite. T. Liu et al./Preparation and Thermal Conductivity of Aluminum Matrix Composites … ADVANCED ENGINEERING MATERIALS 2015, 17, No. 4

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Effect of titanium carbide coating on the microstructure and thermal conductivity of short graphite fiber/copper composites

Cited by 31 publications

References 19 publications

Effect of chromium carbide coating on thermal properties of short graphite fiber/Al composites

Effect of chromium carbide coating on thermal properties of short graphite fiber/Al composites

Fabrication and thermophysical properties of short graphite fiber/Cu composites with Mo<inf>2</inf>C coating by vacuum pressure infiltration

Preparation and Thermal Conductivity of Spark Plasma Sintered Aluminum Matrix Composites Reinforced with Titanium‐Coated Graphite Fibers

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