Method for making mineral wool, cobalt-based alloys therefor and other uses

摘要

The invention concerns a method for making mineral wool by internal centrifuging characterised in that the temperature of the mineral material in the fibre-forming spinner is at least 1100 °C and the fibre-forming spinner consists of a cobalt-based alloy comprising the following elements (in weight percentages of the alloy): Cr 23 to 34 %, Fe less than 3 %, Ni 6 to 12 %, Si less than 1 %, Ta 3 to 10 %, Mn less than 0.5 %, C 0.2 to 1.2 %, Zr less than 0.1 %, W 0 to 8 %, the rest being formed by cobalt and unavoidable impurities, the mol ratio of tantalum to carbon being at least 0.3. The invention also concerns alloys particularly suited for this method corresponding to said formula and do not contain tungsten. The inventive alloys can be used for other purposes in oxidising atmosphere at a temperature of at least 1100 °C.