Effect of pore structure on the thermophysical and frictional properties of high-density graphite

被引：22
作者：
Liu, Ben [1 ,2 ]
Zhao, Hongchao [1 ]
Li, Xiangfen [1 ]
Yang, Zonghe [1 ,2 ]
Zhang, Dongqing [1 ]
Liu, Zhanjun [1 ]
机构：
[1] Chinese Acad Sci, Inst Coal Chem, Key Lab Carbon Mat, Taiyuan 030001, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2022年 / 330卷
关键词：
High-density graphite; Pore structure; Graphitization degree; Friction coefficient; Wear rate; THERMAL-CONDUCTIVITY; CARBON; MICROSTRUCTURE; GRAPHITIZATION; COMPOSITES; CONTACT; PITCH; SIZE;
D O I：
10.1016/j.micromeso.2021.111613
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
High density graphite is widely used in friction and sealing area. The pore structure inside, which were mainly affected by molding method, has a great effect on its thermophysical properties and friction performance. Herein, isostatic pressing, compression molding and hot molding method were utilized in our work to prepare high density graphite with different pore structure in order to study the relationship between pore structure and the comprehensive property. The results showed that the properties of graphite vary significantly in different directions, which was mainly affected by porosity, pore size distribution, the specific surface area, pore shape and fractal dimension. The influence mechanism of three graphite materials with different pore structures on thermophysical properties was delved, and the correlation between the comprehensive properties of graphite materials and their pore structures was verified. The in-plane comprehensive properties of hot molding graphite were the best, the graphitization degree was the highest (75.4%) and the total porosity was the lowest (15.08%). Especially, according to the pore structure analysis of the graphite, we found a positive correlation between the fractal dimension and the friction and wear properties of the graphite materials. Furthermore, research of pore structure explained the properties of graphite materials and proved the potential application of graphite in friction and sealing fields.
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页数：9
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