Improving the mechanical properties of a high density carbon block from mesocarbon microbeads according to oxidative stabilization

Abstract

In this study, a high density carbon block without binder was manufactured by mesocarbon microbeads (MCMB) from coal tar pitch. To develop the high density carbon block without a binder, MCMBs were oxidized at different levels of temperature. To verify the effect of oxygen content in the carbonized carbon block (CCB), an elementary analysis (EA) and X-ray photoelectron spectroscopy (XPS) were performed. The morphological and mechanical properties of the CCBs were investigated by using scanning electron microscopy (SEM), a shore hardness test, and a flexural strength evaluation. The results revealed that the oxygen content increased with stabilization temperature and the physical properties of the CCBs were considerably improved via oxidative stabilization. Small cracks between MCMB particles were observed in the CCBs that were stabilized over 250 °C. From the results of this study, the CCB from MCMBs stabilized at 200 °C for 1 h showed optimum mechanical properties and high density.

Mechanical and electrical properties of MCMB/Chopped carbon fiber composite with different bead size

“…On the other hand, mesocarbon microbeads (MCMB) used as a precursor of artificial graphite blocks have an excellent self-sintering property, and are relatively easy to manufacture as an artificial graphite block 8–12 . Furthermore, this block made of MCMB exhibits high mechanical properties without the impregnation process 10,11,13–15 .…”

Microstructure and Tribological Performance of Mesocarbon Microbead–Silicon Carbide Composites

“…As shown in Figure 2f, after sintering, the aromatic layers of MCMBs were split; the split also hindered the densification process. However, the relative density of M-30 was a little higher than that of M-20, which was due to the self-sintering property of MCMBs [19,31]. As shown in Figure 2, the phase distribution of M-30 was MCMB-dominant during sintering; the shrinkage of MCMBs can fill some pores.…”

“…As a new carbon source, mesocarbon microbeads (MCMBs) have recently attracted attention as an active electrode material in lithium and sodium cells due to their excellent electrochemical properties [15,16]. Due to their good self-sintering ability, easy graphitization, and special structure—which is a regular sphere assembled by aromatic layers—MCMBs have been studied as precursors to graphite artifacts [17,18,19]. According to previous reports, MCMBs can graphitize when sintered at high temperature [17,20], possessing similar properties as graphite, such as good lubrication and good thermal shock resistance.…”

Manufacture of high density carbon blocks by self-sintering coke produced via a two-stage heat treatment of coal tar

“…The slopes in the Fig. 5 are clearly divided into 3 sections: over 620 °C, 450–620 °C and 150–450 °C [ 1 , 11 , 21 ]. The weight loss ratio from 150 °C to 620 °C of the 2S-Cs that manufactured at 500 °C for 1 h in the 2 nd stage treatment was significantly greater than that of the 2S-Cs that was manufactured at 500 °C for 3 h in the 2 nd stage treatment.…”

“…The sintering process of MCMB and mesophase powders was reported as consisting of two stages: a sintering step in the fluid phase in which the heaviest fractions fill the voids and cause adhesion, and a sintering step in the solid phase in which shrinkage and densification take place [ 11 , 13 , 19 , 21 ]. Thus, petroleum residues have been mainly studied as raw materials for fluids since they allow easy control of the heaviest fractions.…”