Binding natural graphite with mesophase pitch: A promising route to future carbon blocks

作者：Zhong, B.; Zhao, G. L.; Huang, X. X.^*; Liu, J.; Chai, Z. F.; Tang, X. H.; Wen, G. W.; Wu, Y.

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2014, 610: 250-257.

DOI：10.1016/j.msea.2014.05.038

• Ceramics
• Bonding
• Sintering
• Electron microscopy
• X-ray diffraction
• Mechanical characterization

Carbon blocks with relatively high graphitization degree ( > 92%) were prepared by simply binding natural graphite flakes with mesophase pitch at 1300-1500 degrees C without the traditionally used high-temperature graphitization process (similar to 3000 degrees C). The influences of pitch content, molding pressure and heat-treatment temperature on the volume density and open porosity, mechanical property, and electrical resistivity of the carbon blocks were systematically investigated. The thermal conductivity and frictional property for typical carbon blocks were tested. The microstructure of the carbon blocks was characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Results showed that carbon blocks with excellent comprehensive properties could be manufactured. Carbon blocks with bending strength up to 41.98 MPa were obtained when the mesophase pitch content was 25 wt%, the molding pressure 40 MPa, and heat-treatment temperature 1300 degrees C. The electrical resistivity and thermal conductivity of the carbon blocks (parallel to the graphite layers) were in the range of 10-15 mu Omega m and 50-60 W/(m K), respectively. The frictional coefficient of the carbon blocks was below 0.1.

• 出版日期2014-7-29
• 单位哈尔滨工业大学