Superconducting molybdenum or molybdenum alloy film prodn. - by coating substrate with molybdenum sulphide and treating with metal and halogen vapour

摘要

Prodn. of superconducting Mo (alloy) films on substrates coated with Mo involves first coating the substrate with sulphides, e.g. MoS2, Mo1-xMxS2 or treating at over 600 degrees C with a gas mixt. of S and/or Se, their halides and diluents e.g. Ar, N2 and/or H2, and then treating at 1000-1200 degrees C with a gas mixt. of perhalides and/or halogens and Mo, Pb, Sn, lanthanides, A-metals and/or their alloys. The process is suitable for the continuous prodn. of films on wires, rods, ribbons and sheets. Pref. coating takes place continuously and the gas used contains 85-99 vol.% diluent and is at a total press. of 0.5-2 atmos. Coating with MoS2 or Mo1-xMxS2 (in which M is Nb, Ta, Ti, Zr, Hf, V, Cr, W. May be carried out by sputtering, evapn. or deposition from a reactive gas phase.