B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 1/00 (2006.01) B01J 23/40 (2006.01) B01J 35/06 (2006.01) B22F 3/00 (2006.01) B22F 9/06 (2006.01) C22C 5/04 (2006.01) F01N 3/28 (2006.01)
Patent
CA 2729968
A metal fibre based on one or more elements from the group consisting of platinum, palladium, rhodium, ruthenium and iridium together with from 0 to 30% by weight of one or more additional alloying elements from the group consisting of nickel, cobalt, gold, rhenium, molybdenum and tungsten has, according to the invention, from 1 to 500 ppm by weight of boron or phosphorus. A nonwoven or mesh according to the invention, in particular for producing nitrogen oxide or for producing hydrocyanic acid, comprises such fibres. To produce fibres based on noble metals together with up to 30% by weight of additional alloying metals, the melting point of the metal is reduced by at least 400°C by addition of boron or phosphorus as alloying constituent before drawing of the fibres from a melt and the boron or the phosphorus is removed again from the fibres.
L'invention concerne une fibre métallique à base d'un ou plusieurs éléments du groupe platine, palladium, rhodium, ruthénium ou iridium, contenant 0 à 30 % en poids d'un ou plusieurs éléments d'alliage supplémentaires du groupe nickel, cobalt, or, rhénium, molybdène et tungstène. La fibre selon l'invention contient également 1 à 500 ppm en poids de bore ou de phosphore. L'invention concerne également un non-tissé ou une toile notamment destiné à la fabrication d'oxyde d'azote ou d'acide cyanhydrique, composé de telles fibres. Pour la fabrication de fibres à base de métaux précieux, contenant jusqu'à 30 % en poids de métaux d'alliage supplémentaires, le point de fusion du métal est réduit d'au moins 400 °C par alliage de bore ou de phosphore avant étirage des fibres, par étirage des fibres à partir d'une matière en fusion, et le bore ou le phosphore sont retirés à nouveau des fibres.
Jantsch Uwe
Lupton David F.
Manhardt Harald
Vorberg Stefan
Macrae & Co.
W.c. Heraeus Gmbh
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