Properties and structural evaluation of fine-grained isostatic-pressing graphite
Fine-grained isostatic-pressing graphites were prepared by liquid mixing method and self-sintering method,respectively.G1 and G2 graphites were prepared by liquid mixing method using the calcined pitch coke aggregates with the average diameters of 10 μm and 5 μm,respectively.G3 graphite was fabricated by mesocarbon microbeads with the average diameters of 5 μm using self-sintering method.Microstructure,porosity,pore size distribution,crystal structure and thermophysical properties of the obtained graphites were systematically studied.Results indicate that the mean pore size of graphite could be adjusted by changing the filler particle size distribu-tion.G2 graphite possesses excellent properties such as high bending strength of 84 MPa,compressive strength of 142 MPa and an aver-age pore diameter of 0.527 μm.However,with the decrease of coke fillers size,both the graphitization degree and crystallite diameter La are decreased.The bending strength and pore size distribution of G3 graphite are 96 MPa and 0.071 μm,respectively.Due to the lower graphitization degree(71.5%)and smaller crystallite diameter(La=38.8 nm)of MCMBs,the thermal conductivity of G3 graphite is limited to 47 W/(m·K),much lower than those of other graphites.
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