Molybdenum foil for grid pulsing travelling wave tube mesh and preparation method thereof

A technology of molybdenum foil and grid, which is applied in the field of molybdenum foil for grid-controlled pulse traveling wave tube grid and its preparation, can solve problems such as performance requirements and preparation method guidance, and achieve good product consistency, strength and toughness matching, and easy The effect of mass production

Active Publication Date: 2019-06-07
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned inventions only involve the improvement of a certain aspect of performance of molybdenum strip / molybdenum sheet, such as extension, deep drawing, bending resistance, etc., and are not developed for the special purpose of grid processing. Molybdenum foil puts forward comprehensive and clear performance requirements and preparation method guidance

Method used

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  • Molybdenum foil for grid pulsing travelling wave tube mesh and preparation method thereof
  • Molybdenum foil for grid pulsing travelling wave tube mesh and preparation method thereof
  • Molybdenum foil for grid pulsing travelling wave tube mesh and preparation method thereof

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preparation example Construction

[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 high temperature for 0.5 hours, to obtain a low-impurity refined sintered molybdenum slab with uniform density; 35% hot rolling along the width direction of the molybdenum slab at 1300 ° C, one fire and one billet, under the protection of hydrogen atmosphere 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 was carried out in the original length direction, with two fires and 6 passes; after the hot-rolled molybdenum billet was subjected to surface al...

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

The invention relates to a molybdenum foil for a grid pulsing travelling wave tube mesh and a preparation method thereof, and belongs to the field of microwave vacuum electronic technology and refractory metal powder metallurgy. The thickness of the molybdenum foil used by the mesh is 0.03-0.25 mm, the dimensional deflection is smaller than or equal to + / - 5 microns, the tensile strength is greater than or equal to 800 MPa, the yield ratio is greater than or equal to 90%, the main texture is {112}(110), and certain amount of {001}(110) components are contained; microstructural characteristicscomprise a laminated fiber structure with mutually overlapping and staggering crystalline grains, wherein the crystalline grains with the shapes of prolate fibers are taken as the primary crystallinegrains, fine and equiaxed crystalline grains are taken as auxiliary crystalline grains, and the primary crystalline grains and the auxiliary crystalline grains are uniformly interwoven. The preparation method comprises the steps that low K low W medium particular dimension molybdenum is taken as the raw material, and warm rolling, hydrogen annealing, surface cleaning shearing, crossed cold rolling, surface deoiling, vacuum destressing annealing and cutting inspection are conducted. The molybdenum foil has the advantages that the molybdenum foil strength is high, the toughness matches, the dimensional precision is high, the punching performance is good, the molybdenum foil can be used for producing a grid controlled traveling wave tube spherical structure mesh, and the preparation method has the advantages of high technological controllability, good product uniformity and easy scale production implementation.

Description

technical field [0001] The invention belongs to the technical fields of microwave vacuum electron technology and refractory metal powder metallurgy, and relates to a molybdenum foil for a grid-controlled pulse traveling wave tube grid and a preparation method thereof. Background technique [0002] High-power traveling wave tubes have the remarkable characteristics of high power, high efficiency, broadband and miniaturization, and are widely used in electronic countermeasures, electronic warfare, ground radar, satellite communications, meteorological observation and space measurement, etc. Function, known as the "heart" of the electronic system. With the increasing demand for the power of the traveling wave tube, simply adding a modulation voltage to the anode or focusing electrode can no longer meet the requirements of large current control. In modern microwave vacuum devices, grid modulation is often used to control the cathode current. The grid-controlled pulse traveling...

Claims

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Application Information

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IPC IPC(8): B22F5/00B22F3/04B22F3/18B22F3/10
Inventor 李艳周增林惠志林何学良
Owner GRIMAT ENG INST CO LTD
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