冶金用コークスの破壊強度 : 材料力学的評価(コークス強度評価技術の新展開,<特集>劣質な石炭のコークス化機構解析とコークス強度評価)

概要

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The failure strength of metallurgical coke is examined on the basis of materials mechanics and fracture mechanics. A novel concept of the "rule of scaling" is addressed for the macro-, meso-, and the micro/nano-structures of coke that comprises complex pores and cracks embedded in a carbonaceous matrix. It is emphasized that the failure strength of coke grains having the dimension of meso-scale (scale from about 5 to about 30mm) is essential for mechanically qualifying the grade of metallurgical coke. Through instrumented spherical indentation testing, the mechanical characterization in mm-scale is conducted for the cokes made from various types of coals encompassing from caking to non-caking coals (strongly coking to poorly coking coals). The indentation test results confirm that the discrepancy in the mechanical properties (elastic modulus, yielding strength, and work-of-indentation) of these cokes in mmscale is insignificant, whereas there exists a crucial discrepancy in the values of their drum indices (DI). The Weibull statistic is applied to the compressive failure load of coke grains with mm-scales (6 to 15mm grains and 15 to 25mm grains). The results of Weibull statistics for the compressive failure loads are successfully related in a quantitative manner to the DI-values.
社団法人日本鉄鋼協会の論文
2006-03-01