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Control of the properties of a binder pitch to enhance the density and strength of graphite blocks KCI 등재
This paper proposes the optimal molecular weight for a petroleum-based binder pitch to enhance the density and strength of the prepared graphite block. The effect of the molecular weight on the binder properties, which was quantified using solvent fractionation, was considered based on the evaluation of the coking and viscosity characteristics. The affinity of the pitch to coke influenced the carbonization yield of the block, and the proportion of closed pores was reduced via the use of a highaffinity binder pitch. In addition, the viscosity was found to influence the uniformity of the coke and pitch dispersions, and numerous open pores were formed in the graphite block under high-viscosity conditions. In terms of the molecular weight, a reduction in the content of the insoluble 1-methyl-2-pyrrolidone (NMP) fraction, which was the heaviest fraction present in the pitch, was found to reduce the affinity of the binder to coke while increasing its viscosity. Therefore, the density and strength of the prepared graphite block were reduced upon increasing the insoluble NMP content of the binder pitch. Consequently, it was necessary to control the content of this fraction within < 13.81 wt% to obtain high-density and high-strength graphite blocks.
Abstract
1 Introduction
2 Materials and methods
2.1 Materials
2.2 Methods
2.2.1 Pitch synthesis
2.2.2 Controlling the NMP insoluble fraction of pitch
2.2.3 Preparation of the graphite blocks
2.3 Characterization of the prepared binder pitch
2.3.1 Thermal properties
2.3.2 Chemical properties
2.3.3 Solvent fractionation
2.4 Characterization of the prepared graphite blocks
2.4.1 Density
2.4.2 Mechanical strength
3 Results and discussion
3.1 Characteristics of the prepared binder pitches
3.2 Effect of the pitch properties on the graphite block
4 Conclusions
Anchor 21
Acknowledgements
References
