| http://www.w3.org/ns/prov#value | - mal hardness and which does not react or reacts only slowly with carbon and/or BN or which does not dissolve or dissolves very little carbon at temperatures up to 1000??? C. Examples of the latter are metals as Cu, Ag, Au, alloys, intermetallic phases, compounds such as oxides and oxide mixtures, silicates, aluminates, spinels, sulphides, carbides, nitrides, carbonitrides, oxycarbides, silicides,
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