Effect of raw materials structure on the properties of isostatic graphite with high strength and high density
The isostatic pressed graphite with high density and high strength was prepared with different types of calcined coke as ag-gregate and medium coaltar pitch as binder.The effect of raw material structure on the properties of isotropic graphite products was in-vestigated.The microstructure and morphology of raw materials and finished products were characterized by scanning electron microsco-py.The graphitization degree of the product was characterized by X-ray diffraction.The mechanical,electrical and thermal properties of the finished products were measured and characterized by universal mechanical testing machine,resistivity tester and thermal expansion coefficient tester,respectively.The results show that the mechanical properties of granular raw materials are higher than those of flake and fibrous raw materials.Under the same process conditions,the performance of products from C raw coke is the best with the bulk density of 1.913 g/cm3,the bending strength of 82.5 MPa,and the compressive strength of 173.2 MPa.
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