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Aluminum nitride reinforced graphite-based composite material and preparation process thereof
The present invention discloses an aluminum nitride reinforced graphite-based composite material and a preparation process thereof. The aluminum nitride reinforced graphite-based composite material is characterized in that flake graphite is adopted as a substrate, and aluminum nitride is adopted as a reinforcing phase and is uniformly distributed between the graphite laminas so as to form a three-dimensional network nitrogen aluminum skeleton and directionally-arranged graphite lamina combined anisotropic structure. According to the process, flake graphite particles, aluminum nitride powder and an appropriate amount of a sintering aid are used, material mixing is performed through a ball mill, drying screening is performed, pre-pressing molding is performed, discharge plasma sintering is performed at a temperature of 1500-1700 DEG C, axial pressure is applied during the sintering process to make the graphite laminas be directionally arranged, and the three-dimensional network ceramic skeleton is formed after sintering the aluminum nitride powder, such that the strength of the graphite substrate can be significantly increased, and the thermal expansion of the graphite can be restrained so as to form the compact and uniform anisotropic composite material with characteristics of high thermal conductivity along the lamina direction and low thermal expansion along the vertical lamina direction, wherein the excellent comprehensive performance of the composite material has wide application prospects in the field of heat transfer, heat dissipating and the like of electronic devices.
Aluminum nitride reinforced graphite-based composite material and preparation process thereof
The present invention discloses an aluminum nitride reinforced graphite-based composite material and a preparation process thereof. The aluminum nitride reinforced graphite-based composite material is characterized in that flake graphite is adopted as a substrate, and aluminum nitride is adopted as a reinforcing phase and is uniformly distributed between the graphite laminas so as to form a three-dimensional network nitrogen aluminum skeleton and directionally-arranged graphite lamina combined anisotropic structure. According to the process, flake graphite particles, aluminum nitride powder and an appropriate amount of a sintering aid are used, material mixing is performed through a ball mill, drying screening is performed, pre-pressing molding is performed, discharge plasma sintering is performed at a temperature of 1500-1700 DEG C, axial pressure is applied during the sintering process to make the graphite laminas be directionally arranged, and the three-dimensional network ceramic skeleton is formed after sintering the aluminum nitride powder, such that the strength of the graphite substrate can be significantly increased, and the thermal expansion of the graphite can be restrained so as to form the compact and uniform anisotropic composite material with characteristics of high thermal conductivity along the lamina direction and low thermal expansion along the vertical lamina direction, wherein the excellent comprehensive performance of the composite material has wide application prospects in the field of heat transfer, heat dissipating and the like of electronic devices.
Aluminum nitride reinforced graphite-based composite material and preparation process thereof
SHI ZHONGQI (Autor:in) / ZHANG XIA (Autor:in) / ZHANG XIAOYU (Autor:in) / XIA HONGYAN (Autor:in) / WANG JIPING (Autor:in) / WANG BO (Autor:in) / WANG HONGJIE (Autor:in) / YANG JIANFENG (Autor:in)
13.01.2016
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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