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

A composite powder and mixed powder technology, which is applied in the field of preparation of ultrafine tungsten-rhenium composite powder containing scandium and strontium, can solve the problems of uniform distribution affecting the cathode electron emission performance, low product qualification rate, and low impregnation efficiency, so as to improve The effect of electron emission performance, low equipment requirements, and low cost

Active Publication Date: 2022-02-18
西安稀有金属材料研究院有限公司
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method and application of superfine tungsten-rhenium composite powder containing scandium and strontium
  • Preparation method and application of superfine tungsten-rhenium composite powder containing scandium and strontium
  • Preparation method and application of superfine tungsten-rhenium composite powder containing scandium and strontium

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of superfine tungsten-rhenium composite powder containing scandium and strontium. The method comprises the steps: 1, tungsten oxide powder, ammonium perrhenate powder and carbon black are subjected to ball milling and then calcined, and tungsten-rhenium mixed powder is obtained; 2, tungsten-rhenium mixed powder is added into the mixed solution, and a solid-liquid mixture is obtained; 3,a solution containing carbonate is added into the solid-liquid mixture for reacting to obtain a precipitate; and 4, sintering is performed to obtain the superfine tungsten-rhenium composite powder containing scandium and strontium. The invention further discloses application of the superfine tungsten-rhenium composite powder containing scandium and strontium in preparation of hot cathode material through one-step sintering. The tungsten oxide powder and the ammonium perrhenate powder serve as sources of tungsten and rhenium, scandium nitrate hexahydrate and strontium nitrate serve as sources of scandium and strontium, a solid-liquid mixing mode is combined with carbon and hydrogen two-step reduction, matrix and precursor active substances do not need to be prepared, and the method is simple and efficient; and the application process is simple, the production period 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap