University of Oulu

Stanislav Gornostayev, Jyrki Heino & Timo Fabritius (2017) Effect of micro-pores on cracks formation in metallurgical coke, Canadian Metallurgical Quarterly, 56:3, 252-258,DOI: 10.1080/00084433.2017.1345059

Effect of micro-pores on cracks formation in metallurgical coke

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Author: Gornostayev, Stanislav1; Heino, Jyrki1; Fabritius, Timo1
Organizations: 1Process Metallurgy Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 4.4 MB)
Persistent link:
Language: English
Published: Informa, 2017
Publish Date: 2020-01-15


The relationships of micro-pores and cracks in metallurgical coke have been investigated by optical microscope and field emission scanning electron microscope, using surface section samples. The pores have circular, elliptical and irregular shapes with smooth outlines, formed during the thermoplastic stage of the coking process. They often associate with connecting cracks between neighbouring pores. In case of elliptical pores, the connecting cracks are usually oriented along the longer axis of the pore. The connecting cracks can be developed between the pores, depending on their size and the distance between them. The coke with a large number of small pores rather than with a small number of larger pores will have lower strength due to the increased amount of connecting cracks. When compared with circular pores, elliptical and flattened pores have a lower ability to resist load pressure. Nano-sized pores have polygonal outlines, indicating an ‘explosion’-type formation in the solidified matrix.

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On a examiné la relation entre les micropores et les fissures du coke métallurgique au moyen de la microscopie optique et de la FESEM, en utilisant des échantillons de section de la surface. Les pores ont des formes circulaires, elliptiques ou irrégulières avec des contours lisses, et sont formés lors de l’étape thermoplastique du procédé de cokéfaction. Ils sont souvent associés à la mise en connexion des fissures entre les pores voisins. Dans le cas des pores elliptiques, les fissures de connexion sont habituellement orientées dans la direction de l’axe le plus long du pore. Les fissures de connexion peuvent se développer entre les pores, dépendant de leurs tailles et de la distance entre eux. Le coke ayant un grand nombre de petit pores plutôt qu’un petit nombre de pores plus grands aura une plus faible résistance à cause de la plus grande quantité de fissures de connexion. Lorsque comparés aux pores circulaires, les pores elliptiques et aplatis ont une habilité plus faible de résister à la pression de la charge. Les pores nanométriques ont des contours polygonaux, indiquant une formation de type ‘explosion’ dans la matrice solidifiée.

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Series: Canadian metallurgical quarterly
ISSN: 0008-4433
ISSN-E: 1879-1395
ISSN-L: 0008-4433
Volume: 56
Issue: 3
Pages: 252 - 258
DOI: 10.1080/00084433.2017.1345059
Type of Publication: A1 Journal article – refereed
Field of Science: 222 Other engineering and technologies
Copyright information: © 2017 Canadian Institute of Mining, Metallurgy and Petroleum. This is an Accepted Manuscript of an article published by Taylor & Francis in Canadian metallurgical quarterly on 20 Jun 2017, available online: