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Preparation method and application of ultrafine tungsten-rhenium composite powder containing scandium and strontium

The technology of composite powder and mixed powder is applied in the field of preparation of ultrafine tungsten-rhenium composite powder containing scandium and strontium. The effect of low performance and equipment requirements and high preparation efficiency

Active Publication Date: 2022-04-08
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The preparation of cathode materials by this method has high requirements for equipment and long production cycle. At the same time, the impregnation efficiency in the third process is low, the product qualification rate is low, and the uniform distribution of the porosity of the porous tungsten matrix seriously affects the electronic properties of the cathode after impregnation. launch performance

Method used

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  • Preparation method and application of ultrafine tungsten-rhenium composite powder containing scandium and strontium
  • Preparation method and application of ultrafine tungsten-rhenium composite powder containing scandium and strontium
  • Preparation method and application of ultrafine tungsten-rhenium composite powder containing scandium and strontium

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Experimental program
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Embodiment 1

[0044] Such as figure 1 As shown, this embodiment includes the following steps:

[0045]Step 1: Ball mill 88.5g of tungsten oxide powder, 4.3g of ammonium perrhenate powder and 7.2g of carbon black to obtain a mixed powder, and then heat it to 1000°C at a heating rate of 5°C / min for 4 hours under an argon atmosphere to obtain Tungsten-rhenium mixed powder;

[0046] Step 2, prepare the mixed solution of 1000mL, wherein the concentration of scandium nitrate hexahydrate is 0.02mol / L, the concentration of strontium nitrate is 0.02mol / L, the concentration of aluminum nitrate nonahydrate is 0.08mol / L, the concentration of barium nitrate is 0.12 mol / L, the concentration of calcium nitrate tetrahydrate is 0.02mol / L, then the tungsten-rhenium mixed powder obtained in step 1 is added in the mixed solution to obtain a solid-liquid mixture;

[0047] Step 3, preparation 1000mL concentration is the solution that contains carbonate group of 2mol / L, then joins the solution that contains car...

Embodiment 2

[0054] Such as figure 1 As shown, this embodiment includes the following steps:

[0055] Step 1. Ball mill 61.3g of tungsten oxide powder, 20g of ammonium perrhenate powder and 7.2g of carbon black to obtain a mixed powder, and then heat it to 1000°C at a heating rate of 5°C / min for 4 hours under an argon atmosphere to obtain tungsten Rhenium mixed powder;

[0056] Step 2, prepare the mixed solution of 1000mL, wherein the concentration of scandium nitrate hexahydrate is 0.03mol / L, the concentration of strontium nitrate is 0.03mol / L, the concentration of aluminum nitrate nonahydrate is 0.1mol / L, the concentration of barium nitrate is 0.14 mol / L, the concentration of calcium nitrate tetrahydrate is 0.03mol / L, then the tungsten-rhenium mixed powder obtained in step 1 is added in the mixed solution to obtain a solid-liquid mixture;

[0057] Step 3, preparation of 1000mL concentration of 3mol / L solution containing carbonate, then the solution containing carbonate is added to the ...

Embodiment 3

[0060] Such as figure 1 As shown, this embodiment includes the following steps:

[0061] Step 1. Ball mill 55.34g of tungsten oxide powder, 37.46g of ammonium perrhenate powder and 7.2g of carbon black to obtain a mixed powder, and then heat it to 1000°C at a heating rate of 5°C / min for 4 hours under an argon atmosphere to obtain Tungsten-rhenium mixed powder;

[0062] Step 2, prepare the mixed solution of 1000mL, wherein the concentration of scandium nitrate hexahydrate is 0.04mol / L, the concentration of strontium nitrate is 0.04mol / L, the concentration of aluminum nitrate nonahydrate is 0.12mol / L, the concentration of barium nitrate is 0.16 mol / L, the concentration of calcium nitrate tetrahydrate is 0.04mol / L, then the tungsten-rhenium mixed powder obtained in step 1 is added in the mixed solution to obtain a solid-liquid mixture;

[0063] Step 3, preparing 1000mL concentration of 4mol / L solution containing carbonate, then adding the solution containing carbonate to the so...

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Abstract

The invention discloses a method for preparing ultrafine tungsten-rhenium composite powder containing scandium and strontium. The method comprises: 1. Ball milling tungsten oxide powder, ammonium perrhenate powder and carbon black to obtain tungsten-rhenium mixed powder; 2. Adding tungsten-rhenium mixed powder into the mixed solution to obtain a solid-liquid mixture; 3. Adding a solution containing carbonate to the solid-liquid mixture to react to obtain a precipitate; 4. Sintering to obtain ultrafine tungsten-rhenium composite powder containing scandium and strontium; The invention also discloses the application of one-step sintering of superfine tungsten-rhenium composite powder containing scandium and strontium to obtain hot cathode material. The present invention uses tungsten oxide powder and ammonium perrhenate powder as the source of tungsten and rhenium, uses scandium nitrate hexahydrate and strontium nitrate as the source of scandium and strontium, and uses a solid-liquid mixing method to combine carbon and hydrogen for two-step reduction without the need to prepare a matrix and The precursor active material has a simple and efficient method; the application process of the invention is simple, the production cycle is short, the cost is low, and the electron emission performance of the hot cathode material is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal functional materials, and in particular relates to a preparation method and application of superfine tungsten-rhenium composite powder containing scandium and strontium. Background technique [0002] With the wide application of electron beams in industrial fields, such as electron beam welding, electron beam 3D printing and electron beam melting, etc., vacuum electronic devices are increasingly developing in the direction of high power, high frequency output, miniaturization and new materials and new processes. As the core part of the vacuum device, the hot cathode is called the "heart" of the vacuum electronic device, and its performance directly determines the performance and life of the device. [0003] Among the hot cathode materials widely used in various vacuum electronic devices, the diffused cathode with tungsten or tungsten alloy as the matrix and alkaline earth metal barium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F9/20
CPCB22F9/22B22F9/20
Inventor 潘晓龙张于胜刘璐孙国栋张思雨田丰李海亮
Owner 西安稀有金属材料研究院有限公司
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