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Journal of the Southern African Institute of Mining and Metallurgy

versão On-line ISSN 2411-9717

Resumo

CARDU, M.  e  GIRAUDI, A.. Metal-rock pair characterization in excavation engineering. J. S. Afr. Inst. Min. Metall. [online]. 2012, vol.112, n.5, pp. 379-386. ISSN 2411-9717.

Abrasivity and wear resistance are not intrinsic properties of materials, but rather parameters describing the interaction between the wear part and the material exerting the wearing action. Moreover, wear or, at least, that part of the wear which is due to the cumulative effect of minute scratches, is linked to the hardness disparity concept. Abrasivity, in this context, is a relative concept, pertaining to a metal-rock pair, rather than to a rock. Based on this assumption, a methodology has been developed and checked against actual cases, enabling description of the abrasiveness of a rock or the abrasion resistance of a metal through the ratio of comparable quantitative indicators. The paper describes the methods and provides examples of applications to practical cases (namely: rock cutting, excavation by means of tunnel boring machines (TBMs), rock crushing, and hydro-mill cutting).

Palavras-chave : metal-rock; wear; microhardness; characterization; small scale.

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