| 摘要 |
The invention relates to a method for producing a metal film composed of an alloy having more than 50% nickel, comprising the following steps: (a) the alloy is melted in amounts of more than one tonne in a vacuum induction furnace, or openly in an induction or arc furnace, followed by a treatment in a VOD or VLF installation, (b) then the alloy is cast into blocks or electrodes or as a continuous casting in order to form a pre-product, optionally followed by a one-time or multiple-time remelting by means of VAR and/or ESR, (c) then the pre-product is annealed if necessary at temperatures between 800 and 1350°C for a duration of 1 h to 300 h under air or protective gas, (d) then the pre-product is hot worked, in particular hot rolled, at temperatures between 1300°C and 600°C, wherein the thickness of the starting material is reduced by a factor of 1.5 to 200, such that the pre-product has a thickness of 1 to 100 mm after the rolling and is not recrystallized and/or recovered and/or is (dynamically) recrystallized having a grain size less than 300 μm, in particular less than 150 μm, (e) the pre-product is then pickled, (f) then the pre-product is cold worked with a degree of deformation greater than 90% to a final thickness of 10 to 600 μm, in particular 40 to 150 μm, in order to produce a film, (g) the film is cut into strips of 5 to 300 mm after the cold working, (h) then the film strips are coated with a ceramic powder loosely or by means of an adhesive or by means of an oxide dissolved in alcohol or covered with a separating film and, if necessary, dried, (i) the film strips are then wound annularly onto one or more mandrels or one or more sleeves, wherein the inner and the outer end are each fastened by means of spot welding or clamps, (j) the annularly wound film strips are then annealed under protective gas at temperatures between 600 and 1200°C for 1 min to 300 h, (k) wherein the annealed film-like material is recrystallized after said annealing and has a large proportion of cubic texture. |
