This paper brings an innovative processing route of manganese deep-sea nodules, which results in completely new grades of alloys. Deep-sea nodules were processed by aluminothermic method without the extraction of individual elements, producing complexly alloyed manganese-based "natural alloys". Three levels of the amount of aluminum were used for the aluminothermic reduction, and hence the alloys differ strongly in the amount of aluminum, which has a significant effect on their phase composition. The alloys have very high wear resistance, comparable with tool steel. The disadvantage of low-aluminum alloy is the susceptibility to local thermal cracking during friction, which occurs especially in the case of a dry sliding wear against the static partner with low thermal conductivity.

Czech Geological Survey Geologická 6 152 00 Prague 5 Czech Republic

Department of Metals and Corrosion Engineering University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic

Institute of Physics of the ASCR v v i Na Slovance 2 182 21 Prague 8 Czech Republic

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