Microstructural Design Techniques of High Thermally Conductive Composites Using Fillers

2018 ◽  
Vol 55 (6) ◽  
pp. 334-339 ◽  
Author(s):  
Kazuaki Sanada
Keyword(s):  
Conductive Composites ◽  
Thermally Conductive ◽  
Microstructural Design ◽  
Design Techniques

Highly thermally conductive UHMWPE/NG composites with the segregated structure and their application for heat spreader

2020 ◽  
pp. 089270572096564
Author(s):  
Xiao Wang ◽  
Hui Lu ◽  
Jun Chen
Keyword(s):  
Thermal Conductivity ◽  
Laser Flash ◽  
Heating Process ◽  
X Ray Diffraction ◽  
Heat Spreader ◽  
Conductive Composites ◽  
Compression Direction ◽  
Thermal Analyzer ◽  
Thermally Conductive ◽  
Plane Direction

In this work, ultra-high molecular weight polyethylene (UHMWPE)/natural flake graphite (NG) polymer composites with the extraordinary high thermal conductivity were prepared by a facile mixed-heating powder method. Morphology observation and X-ray diffraction (XRD) tests revealed that the NG flakes could be more tightly coated on the surface of UHMWPE granules by mixed-heating process and align horizontally (perpendicular to the hot compression direction of composites). Laser flash thermal analyzer (LFA) demonstrated that the thermal conductivity (TC) of composites with 21.6 vol% of NG reached 19.87 W/(m·K) and 10.67 W/(m·K) in the in-plane and through-plane direction, respectively. Application experiment further demonstrated that UHMWPE/NG composites had strong capability to dissipate the heat as heat spreader. The obtained results provided a valuable basis for fabricating high thermal conductive composites which can act as advanced thermal management materials.

Thermal-Structural Performance of Orthotropic Pin Fin in Electronics Cooling Applications

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
A. F. M. Arif ◽  
Syed M. Zubair ◽  
S. Pashah
Keyword(s):  
Heat Sink ◽  
Structural Response ◽  
Electronics Cooling ◽  
Base Plate ◽  
Thermal Design ◽  
Heat Flow Rate ◽  
Thermal Interface ◽  
Conductive Composites ◽  
Thermally Conductive ◽  
As Stress

Thermally conductive composites as compared to metals have reduced density, decreased oxidation, and improved chemical resistance, as well as adjustable properties to fit a given application. However, there are several challenges that need to be addressed before they can be successfully implemented in heat sink design. The interface between the device and heat sink is an important factor in the thermal design of microelectronics cooling. Depending on the thermal interface conditions and material properties, the contact pressure and thermal stress level can attain undesirable values. In this paper, we investigate the effect of thermal interface between the fin and base plate on thermal-structural behavior of heat sinks. A coupled-field (thermal-structural) analysis using finite element method is performed to predict temperature as well as stress fields in the interface region. In addition temperature and heat flow rate predictions are supported through analytical results. effect of various interface geometrical (such as slot-depth, axial-gap, and radial-gap) and contact properties (such as air gap with surface roughness and gaps filled with interface material) on the resulting thermal-structural response is investigated with respect to four interface materials combinations, and it is found that the thermal performance is most sensitive to the slot-depth compared to any other parameter.

scholarly journals Measurements of Aluminum-Annealed Pyrolytic Graphite Composite Baseplates with Improved Thermal Conductivity

2021 ◽  
Vol 16 (2) ◽  
pp. 042-047
Author(s):  
Yanfei Bian ◽  
SHI Jian-zhou ◽  
XIE Ming-jun ◽  
CAI Meng
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Management ◽  
Pure Aluminum ◽  
Pyrolytic Graphite ◽  
Aluminum Plate ◽  
Graphite Composite ◽  
Conductive Composites ◽  
Thermal Potential ◽  
Thermally Conductive

Annealed pyrolytic graphite (APG) is a material with thermal conductivity of about 1500 W/(m·K). This property may enable the usage of APG’s thermal potential to develop highly thermally conductive composites for devices requiring effective thermal management. In this paper, APG has been encapsulated in aluminum by brazing, and the thermal properties of Al-APG composite baseplates were measured. The results show that the thermal conductivity of the Al-APG composite baseplates is about 620 W/(m·K), which is four times higher than the pure aluminum plate (152 W/(m·K)).

scholarly journals Practical PBT/PC/GNP composites with anisotropic thermal conductivity

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36316-36323 ◽  
Author(s):  
Xiaolei Zheng ◽  
Bianying Wen
Keyword(s):  
Thermal Conductivity ◽  
Polymer Blends ◽  
Preparation Method ◽  
Selective Distribution ◽  
Conductive Composites ◽  
Anisotropic Thermal Conductivity ◽  
Thermally Conductive ◽  
Conductive Fillers

The selective distribution of thermally conductive fillers in a co-continuous polymer blends provides an industrialized preparation method that takes into account both the properties and functions of thermally conductive composites.

Multifunctional Liquid Crystal Polymeric Composites Embedded With Graphene Nano Platelets

2011 ◽  
Author(s):  
Muhammad Omer Khan ◽  
Ellen Chan ◽  
Siu N. Leung ◽  
Hani Naguib ◽  
Francis Dawson ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Liquid Crystal ◽  
Heat Dissipation ◽  
Three Dimensional ◽  
Cost Effective ◽  
Polymeric Composites ◽  
Potential Cost ◽  
Conductive Composites ◽  
The Matrix ◽  
Thermally Conductive

This paper studies the development of new multifunctional liquid crystal polymeric composites filled with graphene nano platelets (GNPs) for electronic packaging applications. A series of parametric studies were conducted to study the effect of GNP content on the thermal conductivity of LCP-based nanocomposites. Graphene, ranging from 10 wt. % to 50 wt. %, were melt-compounded with LCP using a twin-screw compounder. The extrudates were ground and compression molded into small disc-shaped specimens. The thermal conductivity of LCP matrix was observed to have increased by more than 1000% where as the electrical conductivity increased by 13 orders of magnitude with the presence of 50 wt% GNP fillers. The morphology of the composites was analyzed using SEM micrographs to observe the dispersion of filler within the matrix. These thermally conductive composites represent potential cost-effective materials to injection mold three-dimensional, net-shape microelectronic enclosures with superior heat dissipation performance.

scholarly journals Hyperbolic graphene framework with optimum efficiency for conductive composites

2021 ◽  
Author(s):  
Xiaoting Liu ◽  
Kai Pang ◽  
Yingjun Liu ◽  
Chao Gao ◽  
Zhen Xu
Keyword(s):  
Thermal Management ◽  
Structural Design ◽  
Design Space ◽  
High Efficiency ◽  
Conductive Filler ◽  
Face To Face ◽  
Conductive Composites ◽  
Electrical Conductivities ◽  
Thermally Conductive ◽  
Multifunctional Nanocomposites

Abstract Constructing conductive filler networks with high efficiency is essential to fabricating functional polymer composites. Although two-dimensional (2D) sheets have prevailed in nanocomposites, their efficiency in enhancing conductive functions seems to reach the limit, as if merely addressing the dispersion homogeneity. Here, we exploit the unrecognized geometrical curvature of 2D sheets to break the efficiency limit of filler systems. The hyperbolic curvature meditates the incompatibility between 2D topology and 3D filler space and holds the efficient conductive path through face-to-face contact. The hyperbolic graphene framework exhibits the record efficiency in enhancing electrically and thermally conductive functions of nanocomposites. At volume loading of only 1.6%, the thermal and electrical conductivities reach 31.6 W/(mK) and 13,911 S/m, respectively. Nanocomposites with hyperbolic graphene framework exhibit great potentials in thermal management, sensing and electromagnetic shielding. Our work presents a geometrically optimal filler system to break the efficiency limit of multifunctional nanocomposites and broadens the structural design space of 2D sheets by curvature modulation to meet more applications.

RTA-Treated Carbon Fiber/Copper Core/Shell Hybrid for Thermally Conductive Composites

2014 ◽  
Vol 6 (10) ◽  
pp. 7498-7503 ◽  
Author(s):  
Seunggun Yu ◽  
Bo-In Park ◽  
Cheolmin Park ◽  
Soon Man Hong ◽  
Tae Hee Han ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Core Shell ◽  
Conductive Composites ◽  
Thermally Conductive ◽  
Treated Carbon

scholarly journals Surface modification and magnetic alignment of hexagonal boron nitride nanosheets for highly thermally conductive composites

RSC Advances ◽  
2017 ◽  
Vol 7 (69) ◽  
pp. 43380-43389 ◽  
Author(s):  
Feng Yuan ◽  
Weicheng Jiao ◽  
Fan Yang ◽  
Wenbo Liu ◽  
Zhonghai Xu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Thermoplastic Polyurethane ◽  
Magnetic Alignment ◽  
Polyurethane Elastomer ◽  
Conductive Composites ◽  
Boron Nitride Nanosheets ◽  
Thermally Conductive ◽  
Thermoplastic Polyurethane Elastomer

The highly ordered thermoplastic polyurethane elastomer (TPU)/BNNSs composites are successfully prepared by the combination of filler modification and magnetic alignment.

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