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Multi-element rare earth boride Sm1-2xEuxBaxB6 polycrystal as well as preparation method and application thereof

A technology of rare earth borides and polycrystals, applied in the direction of boron/borides, metal borides, etc., can solve the problems of limited product size, complex preparation process, high pressing pressure, etc., and achieve simple preparation process, excellent emission performance, and compaction less stressful effect

Active Publication Date: 2020-11-10
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts boron / carbothermal reduction method to obtain Eu and Ba atoms instead of SmB 6 Sm of some Sm atoms in the lattice 1-2x Eu x Ba x B 6 After the single-phase powder, through the improved hot pressing and sintering molding process, the prepared Sm 1-2x Eu x Ba x B 6 Polycrystalline, single-phase, has the advantages of high purity, high density, and excellent emission performance. At the same time, the invention solves the problems of high pressing pressure, complicated preparation process, high cost, and limited product size in the prior art. And other issues

Method used

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  • Multi-element rare earth boride Sm1-2xEuxBaxB6 polycrystal as well as preparation method and application thereof
  • Multi-element rare earth boride Sm1-2xEuxBaxB6 polycrystal as well as preparation method and application thereof
  • Multi-element rare earth boride Sm1-2xEuxBaxB6 polycrystal as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The invention adopts boron / carbothermal reduction method-hot pressing sintering integrated process to prepare Sm with different sizes and high performance 0.4 Eu 0.3 Ba 0.3 B 6 polycrystalline, including the following steps:

[0039] Step 1: Raw material Sm 2 o 3 、Eu 2 o 3 、BaCO 3 , B 4 C, B powder are weighed according to the stoichiometric ratio of 0.4:0.3:0.6:3:1 (molar ratio), wherein Sm 2 o 3 、Eu 2 o 3 、BaCO 3 Both are multiplied by an excess coefficient of 1 to 1.5, and the raw materials are mixed evenly and placed in a graphite crucible;

[0040] Step 2: Place the graphite crucible in a vacuum carbon tube furnace, and start heating when the vacuum degree is lower than 0.01Pa. The process parameters are: heating rate 10°C / min, holding temperature 1800°C, holding time 1-2h, Take it out with the furnace cooling to room temperature;

[0041] Step 3: Grinding the synthetic product in step 2, pickling (0.5mol / L dilute hydrochloric acid), washing with wat...

Embodiment 2

[0045] The difference between this example and Example 1 is that the stoichiometric ratio of the five raw materials in Step 1 is 0.6:0.2:0.4:3:1, and the others are the same as Example 1.

[0046] Prepared Sm 0.6 Eu 0.2 Ba 0.2 B 6 The color of the polycrystalline block is blue, and the XRD pattern is as follows Figure 4 As shown, it can be seen from the figure that the sample has a single-phase structure; through EDS energy spectrum analysis, the chemical purity of the polycrystal reaches 99.25%, the relative density is 95.2%, and the resistivity is ~258μΩ.cm.

Embodiment 3

[0048] The difference between this example and Example 1 is that the stoichiometric ratio of the five raw materials in Step 1 is 0.8:0.1:0.2:3:1, and the others are the same as Example 1.

[0049] Prepared Sm 0.8 Eu 0.1 Ba 0.1 B 6The color of the polycrystalline block is blue, and the XRD pattern is as follows Figure 5 As shown, it can be seen from the figure that the sample has a single-phase structure; by EDS energy spectrum analysis, the chemical purity of the polycrystal reaches 99.24%, the relative density is 96.1%, and the resistivity is ~270μΩ.cm.

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Abstract

The invention discloses a multi-element rare earth boride Sm1-2xEuxBaxB6 polycrystal as well as a preparation method and application thereof. The preparation method comprises the following steps: taking Sm2O3, Eu2O3, BaCO3, B4C and boron powder as raw materials, and carrying out proportioning and mixing; preparing Sm1-2xEuxBaxB6 single-phase powder by adopting a boron / carbon thermal reduction method; and putting the powder into a graphite mold, and carrying out hot pressed sintering in a sectional heating, heat preservation and sectional cooling manner and a linear pressure reduction manner after linear pressurization to prepare the Sm1-2xEuxBaxB6 polycrystal, in which x is more than or equal to 0.1 and less than or equal to 0.3. The polycrystal prepared by the method is single-phase, highin purity, high in density and excellent in emission performance, and can be used as a cathode material. The preparation process is simple, the pressing pressure is small, the production cost is low,and polycrystals with different sizes can be prepared.

Description

technical field [0001] The invention relates to the technical field of rare earth boride cathode materials, in particular to a multi-element rare earth boride Sm 1-2x Eu x Ba x B 6 Polycrystal and its preparation method and application. Background technique [0002] from LaB 6 Since its appearance, rare earth hexaboride (REB 6 ) Due to its unique structure and performance, it replaces traditional tungsten cathodes and is widely used in radars, plasma engines and ion thrusters, high-power emission tubes, magnetrons, electron sources for electron beams and ion beams, electric light source devices, vacuum micro / Nanoelectronic devices and electron emitters, etc. As the key cathode material for thermionic emission, rare earth hexaboride has been researched for its high melting point, high hardness, good thermal stability, stable chemical properties, high conductivity, low electron work function (work function) and resistance to ion bombardment. extensive attention of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04
CPCC01B35/04C01P2002/72C01P2006/80C01P2006/40
Inventor 赵瑞山黄美松王志坚刘华杨露辉樊玉川傅臻
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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