A Microscopic Study on the Crack Development in the Blast Furnace Cokes with Various Texture

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Abstract
The crack development in the blast furnace coke was studied at the carbonization and calcination stages by continuous microscopic observation of the same area of the polished coke surface, since the crack may be very influential on its mechanical strength. The extent and direction of the crack development were summarized in relation to the optical texture in the coke.1) NO crack is observable in the isotropic, Mc and CF texture of the carbonized coke, however some small ones developed by the calcination at 1, 000°C.2) In the Mvf and Mf regions, no crack appeared even after the calcination.3) In the F and D regions, cracks observed in the carbonized coke and further grew at the calcination.4) The cracks appeared in the boundary of the different optical textures.The initiation and propagation of crack were discussed on the basis of the local contractibity due to the orientation of micro cristallines which reflected the optical texture .

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