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Rhenium tungsten based cathode material and preparation method thereof

A cathode material, tungsten-based technology, applied in the cathode material and preparation, rhenium-tungsten-based cathode and its preparation field, can solve the problems of complex preparation process, short cathode life, poor controllability and repeatability, etc., and achieve simple preparation process, distributed Uniform, reproducible results

Inactive Publication Date: 2012-08-08
BEIJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0003] The rhenium-coated "M" type cathode also improves the emission current density and anti-ion bombardment of the cathode by depositing a layer of rhenium film on the surface of the barium-tungsten cathode, but the preparation process of this cathode is complicated, and the controllability and repeatability are poor. shorter lifespan

Method used

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  • Rhenium tungsten based cathode material and preparation method thereof
  • Rhenium tungsten based cathode material and preparation method thereof
  • Rhenium tungsten based cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0015] Example 1: Dissolve 10.824g of ammonium perrhenate in water to form a solution, add 2.5g of tungsten powder into the ammonium perrhenate solution and stir to form a solid-liquid mixture, then heat the solid-liquid mixture in a water bath at 90°C, and the water evaporates completely The mixed powder is then dried. Put the dried mixed powder in a hydrogen tube furnace for reduction. The first reduction temperature is 400°C, and the holding time is 1h; the second reduction temperature is 900°C, and the holding time is 2h, and then lowered to room temperature Obtain tungsten-rhenium powder containing 75% rhenium; put the cathode powder at 2t / cm 2 Under pressure, it is pressed into a cathode substrate with a diameter of 3 mm, and sintered at 1500 ° C by powder metallurgy; then impregnated with barium aluminate calcium salt (BaO, CaO and Al 2 o 3 The molar ratio is 6:1:2), the impregnation amount is 10%, and the emission of the cathode is tested at different temperatures, s...

Embodiment 2

[0016] Example 2: Dissolve 3.608g of ammonium perrhenate in water to make a solution, add 7.5g of tungsten powder into the ammonium perrhenate solution and stir to form a solid-liquid mixture, then stir and heat the solid-liquid mixture in a water bath at 70°C, and the water evaporates completely The mixed powder is then dried. Put the dried mixed powder in a hydrogen tube furnace for reduction. The first reduction temperature is 400°C, and the holding time is 1h; the second reduction temperature is 900°C, and the holding time is 2h, and then lowered to room temperature Obtain the tungsten-rhenium powder containing rhenium 25wt%; 2 A cathode substrate with a diameter of 3mm was pressed under pressure and sintered at 1700°C; then impregnated with barium aluminate calcium salts (BaO, CaO and Al 2 o 3 The molar ratio is 6:1:2), the impregnation amount is 10%, and the emission of the cathode is tested at different temperatures, see Table 1.

Embodiment 3

[0017] Example 3: Dissolve 7.216g of ammonium perrhenate in water to make a solution, add 5g of tungsten powder into the ammonium perrhenate solution and stir to form a solid-liquid mixture, then heat the solid-liquid mixture in a water bath at 80°C, and after the water is completely evaporated The mixed powder is dried. Put the dried mixed powder in a hydrogen tube furnace for reduction. The first reduction temperature is 400°C, and the holding time is 1h; the second reduction temperature is 900°C, and the holding time is 2h, and then lowered to room temperature Obtain the tungsten-rhenium powder containing rhenium 50wt%; 2 Under pressure, it is pressed into a cathode substrate with a diameter of 3 mm, and is sintered at 1900 ° C by powder metallurgy; then impregnated with barium aluminate calcium salt (BaO, CaO and Al 2 o 3 The molar ratio is 6:1:2), the impregnation amount is 10%, and the emission of the cathode is tested at different temperatures, see Table 1.

[0018] ...

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Abstract

The invention relates to a rhenium tungsten based cathode material and a preparation method thereof and belongs to the technical field of a refractory metal thermal cathode material. BaO, CaO and Al2O3 are loaded in pores of a porous rhenium tungsten base; the rhenium tungsten base is formed by coating tungsten grains by rhenium. The preparation method comprises the following steps: dissolving ammonium perrhenate in water, thereby preparing into a solution; adding tungsten powder into the ammonium perrhenate solution and stirring; drying; resolving and reducing in two steps under the hydrogen atmosphere, thereby obtaining rhenium tungsten powder; and pressing and sintering the rhenium tungsten powder under the hydrogen atmosphere, thereby obtaining a rhenium tungsten base and steeping into a molten barium aluminate calcium salt. The preparation method provided by the invention has the advantages that the preparation process is simple, the introduction of impurity element during the preparation process is avoided, the repeatability is strong, the prepared cathode material is excellent in emitting property, and the ion bombardment resistance of a traditional barium tungsten cathode is enhanced.

Description

technical field [0001] The invention relates to a cathode material and a preparation method, particularly a rhenium-tungsten-based cathode and a preparation method, belonging to the technical field of refractory metal hot cathode materials. Background technique [0002] The cathode is the electron emission source of vacuum electronic devices, and is its core component, which plays a vital role in the power output and life of vacuum electronic devices. At present, traditional barium-tungsten cathodes are mainly used in various klystrons and traveling wave tubes. With the continuous development of vacuum electronic devices, the performance requirements of cathodes are getting higher and higher, especially in my country's national defense, aerospace science and technology The development of vacuum electronic devices requires stable operation and high power output in harsher environments, which requires the cathode to have a large emission current density, good anti-ion bombardme...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C32/00C22C1/08B22F9/22B22F3/11
Inventor 王金淑刘伟王茜崔云涛王凯风梁文龙周美玲左铁镛
Owner BEIJING UNIV OF TECH
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