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A five-element rare earth boride single crystal hot cathode material and its preparation method

A technology of rare earth borides and hot cathodes, which is applied in the growth of polycrystalline materials, chemical instruments and methods, and single crystal growth. It can solve the problems of small single crystal size, achieve good thermal emission performance and ensure high purity.

Active Publication Date: 2021-12-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of single crystal size small, penta-element rare earth hexaboride single crystal growth process, further explore the electron emission potential of rare-earth boride, and provide a large-size (diameter greater than 6mm) penta-element rare earth boron Compound single crystal hot cathode material and preparation method thereof

Method used

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  • A five-element rare earth boride single crystal hot cathode material and its preparation method
  • A five-element rare earth boride single crystal hot cathode material and its preparation method
  • A five-element rare earth boride single crystal hot cathode material and its preparation method

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Embodiment 1

[0022] The present embodiment prepares five elemental rare earth borides (Ce 0.4 La 0.2 PR 0.2 Nd 0.2 )B 6 Single crystal:

[0023] (1) CeB with a purity of not less than 99.9% and a particle size of less than 360 mesh 6 、LaB 6 , PrB 6 、NdB 6 The powder is used as the raw material, and it is evenly mixed and dried by ball milling at a molar ratio of 2:1:1:1. The resulting mixed powder is placed in a graphite mold, pre-pressed (at a pressure of 10MPa), and then placed in the cavity of a spark plasma sintering furnace. Vacuumize until the vacuum degree is not higher than 5Pa, apply an axial pressure of 40MPa, heat up to 1700°C, and hold for 5 minutes; after completion, cool with the furnace, take out the sample when the furnace temperature is not higher than 50°C, and obtain a polycrystalline sample;

[0024] (2) Cut the polycrystalline sample into a polycrystalline test rod with a diameter of Ф6mm by using a wire electric discharge machine. The rods were placed in an e...

Embodiment 2

[0031] The present embodiment prepares five elemental rare earth borides (Ce 0.7 La 0.1 PR 0.1 Nd 0.1 )B 6 Single crystal:

[0032] (1) CeB with a purity of not less than 99.9% and a particle size of less than 360 mesh 6 、LaB 6 , PrB 6 、NdB 6 The powder is used as the raw material, and it is evenly mixed and dried by ball milling at a molar ratio of 7:1:1:1. The resulting mixed powder is placed in a graphite mold, pre-pressed (at a pressure of 10MPa), and then placed in the cavity of a spark plasma sintering furnace. Vacuumize until the vacuum degree is not higher than 5Pa, apply an axial pressure of 40MPa, heat up to 1700°C, and hold for 5 minutes; after completion, cool with the furnace, take out the sample when the furnace temperature is not higher than 50°C, and obtain a polycrystalline sample;

[0033] (2) Cut the polycrystalline sample into a polycrystalline test rod with a diameter of Ф6mm by using a wire electric discharge machine. The rods were placed in an e...

Embodiment 3

[0038] The present embodiment prepares five elemental rare earth borides (Ce 0.55 La 0.15 PR 0.15 Nd 0.15 )B 6 Single crystal:

[0039] (1) CeB with a purity of not less than 99.9% and a particle size of less than 360 mesh 6 、LaB 6 , PrB 6 、NdB 6 The powder is used as the raw material, and it is evenly mixed and dried by ball milling at a molar ratio of 11:3:3:3. The resulting mixed powder is put into a graphite mold, pre-pressed (10MPa pressure), and then placed in the cavity of a spark plasma sintering furnace. Vacuumize until the vacuum degree is not higher than 5Pa, apply an axial pressure of 40MPa, heat up to 1700°C, and hold for 5 minutes; after completion, cool with the furnace, take out the sample when the furnace temperature is not higher than 50°C, and obtain a polycrystalline sample;

[0040] (2) Cut the polycrystalline sample into a polycrystalline test rod with a diameter of Ф6mm by using a wire electric discharge machine. The rods were placed in an elect...

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Abstract

The invention discloses a five-element rare earth boride single crystal hot cathode material and a preparation method thereof, which consists of (Ce x La (1‑x) / 3 PR (1‑x) / 3 Nd (1‑x) / 3 )B 6 , 0<x<1; it is prepared by combining spark plasma sintering and optical zone fusion. The prepared five yuan rare earth boride (Ce x La (1‑x) / 3 PR (1‑x) / 3 Nd (1‑x) / 3 )B 6 The single crystal size is large (diameter up to 6mm), and the crystal quality is high and the thermal emission performance is good.

Description

technical field [0001] The invention relates to a five-element rare earth boride single crystal hot cathode material, belonging to the technical field of rare earth boride hot cathode materials. Background technique [0002] Hexaboride single crystal is a cermet single crystal material composed of rare earth elements and boron. It has the advantages of low work function, high melting point, low evaporation rate, strong resistance to ion bombardment, and good reusability in a dynamic environment. It is an excellent thermionic emission cathode material, which is widely used in national defense and civil high-tech fields such as satellites, spacecraft, nuclear energy, plasma sources, electron beam processing, electron microscopes, electron beam welders, and 3D printers. Since J.M.Lafferty discovered that lanthanum hexaboride has excellent electron emission characteristics in 1951, it has aroused the interest of scientists from all over the world, and since then started the rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/10C30B13/00C30B13/16H01J1/148
CPCH01J1/148C30B13/00C30B13/16C30B29/10
Inventor 张久兴王盼杨新宇宁舒羽王衍胡可
Owner HEFEI UNIV OF TECH
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