Molybdenum foil for grid-controlled pulse traveling wave tube grid and preparation method thereof
A molybdenum foil and grid technology is applied in the field of molybdenum foil for grid-controlled pulse traveling wave tube grid and its preparation, which can solve problems such as performance requirements and preparation method guidance, and achieve good product consistency, good stamping performance, and process technology. Highly controllable effect
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[0061] The technological process of the molybdenum foil preparation method for the grid of the present invention is as follows figure 1 As shown, it includes the following steps: selection of molybdenum powder raw materials, 1 cold isostatic pressing; 2 compound sintering; 3 hot rolling blanking; 4 cross hot rolling; Annealing; 8 surface cleaning and shearing; 9 cross cold rolling; 10 surface degreasing; 11 vacuum stress relief annealing; performance molybdenum foil material.
[0062] The preparation method of the molybdenum foil material for grids of the present invention reaches the low-K and low-W medium particle size (Fischer particle size 3-5 μm) of FMo-1 in the national standard GB / T 3461-2006 with a purity of K≤30ppm and W≤50ppm. Molybdenum powder is used as raw material, prepared by refined molybdenum compact, composite sintering, low temperature large deformation billet opening, low temperature cross hot rolling, alkali washing, grinding and shearing, warm rolling, h...
Embodiment 1
[0076]Low-K and low-W molybdenum powder with a Fibonacci particle size of 3.1 μm is evenly loaded into a soft rubber mold fixed and limited by a rigid sleeve, and isostatically pressed at 250 MPa for 10 minutes; Pre-sintering at a low temperature of 1200 ° C for 1 hour, and then directly change the hydrogen atmosphere to 10 -3 Pa vacuum environment, sintering at 1900°C for 0.5 hours at a high temperature to obtain a refined sintered molybdenum slab with uniform density and low impurities; 35% hot rolling along the width direction of the molybdenum slab at 1300°C, one fire and one billet opening, hydrogen atmosphere protection After intermediate heating at 1150°C for 20 minutes, two heats and 4 passes of hot rolling are carried out. The rolls are preheated at 500°C and the intermediate heating temperature is 1050°C. The first cross-rolling is carried out along the original length direction, with two fires and 6 passes; after the hot-rolled molybdenum billet is subjected to surf...
Embodiment 2
[0080] Low-K and low-W molybdenum powder with a Fibonacci particle size of 4.6 μm is evenly loaded into a soft rubber mold with a rigid sleeve for fixed and limited positions, and isostatically pressed at 100 MPa for 20 minutes; Pre-sintering at a low temperature of 1300 °C for 2 hours, and then directly change the hydrogen atmosphere to 10 -2 Pa vacuum environment, sintering at 2000°C for 3 hours at a high temperature to obtain a refined sintered molybdenum slab with uniform density and low impurities; hot rolling at 1200°C along the width direction of the molybdenum slab by 25%, one fire and one billet, hydrogen atmosphere protection After intermediate heating at 1050°C for 30 minutes, hot rolling with two heats and 2 passes is carried out. The rolls are preheated at 400°C and the intermediate heating temperature is 950°C. The first cross-rolling is carried out along the original length direction, with two fires and 5 passes; after the hot-rolled molybdenum billet is subject...
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Abstract
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