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Abstract
Economic and strategic considerations due to the scarcity and cost of metals (tantalum, tungsten, cobalt etc.) together with technological requirements (improved machining properties to increase toughness and wear resistance) require the development of new sintered hard metals. Such materials can be produced by the total or partial replacement of cobalt by iron, nickel or ruthenium, of tungsten by molybdenum or titanium and of tantalum by niobium or hafnium. They can also be produced by optimal control of composition and microstructure, the development of specific substrates for coating and the development of new coatings.
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