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Cathode salt, preparation method thereof, barium-tungsten cathode containing cathode salt and preparation method of barium-tungsten cathode

A cathode and cathode vehicle technology, applied in the field of microwave devices, can solve problems such as the decrease of emission current, the cathode is not resistant to ion bombardment, the technical indicators such as tube power, pass rate, and life cannot meet the requirements, and achieve the increase of ion bombardment resistance. , Guaranteed the effect of emission current and performance

Active Publication Date: 2015-07-08
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of the existing barium tungsten cathode, after the emission surface is bombarded by ions, the emission current drops, and the technical indicators such as the power, pass rate, and life of the tube cannot meet the requirements. This phenomenon occurs. The main reason is that the cathode is not resistant to ion bombardment. After being bombarded by ions, the original normal emission state of the cathode surface is destroyed, and the emission material elemental barium cannot be migrated to the emission surface in time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of cathode salt, the ratio of its raw material components is: BaCO 3 4. CaCO 3 0.4, Al 2 o 3 1.

[0024] A method for preparing the cathode salt, comprising the steps of:

[0025] 1) Weigh the analytically pure BaCO according to the formula quantity 3 78.9g, CaCO 3 4g, Al 2 o 3 10.2g, put the three materials into an agate jar, take 5 agate balls with a diameter of 15mm and 4 agate balls with a diameter of 25mm, take 0.1L of pure water, put them into the agate jar for ball milling for 36 hours, and mix well;

[0026] 2) Take out the evenly mixed powder after ball milling from the agate jar, and dry it in an oven at 120°C for 24 hours to dry the powder;

[0027] 3), the unit pressure is 0.4T / cm 2 Press the powder into a block with a thickness of 12mm;

[0028] 4) Sintering the pressed bulk powder in a dry hydrogen atmosphere at a sintering temperature of 1300° C. for 2 hours. Prepare the cathode, comprising the following steps:

[0029] A, preparation o...

Embodiment 2

[0034] A kind of cathode salt, the ratio of its raw material components is: BaO4.5, CaO0.55, Al 2 o 3 1.

[0035] A method for preparing the cathode salt, comprising the steps of:

[0036] 1) Weigh the analytically pure BaCO according to the formula quantity 3 88.8g, CaCO 3 5.5g, Al 2 o 3 10.2g, put the three materials into an agate jar, and take 5 agate balls with a diameter of 15mm and 4 agate balls with a diameter of 25mm, take 0.125L of pure water, carry out ball milling for 42 hours, and mix well; 2), after ball milling, mix evenly The powder is taken out from the agate jar, and dried in an oven at 150°C for 18 hours to dry the powder;

[0037] 3) Press the powder into a block with a thickness of 11mm with a unit pressure of 0.6T / cm2;

[0038] 4) Sintering the pressed bulk powder in a dry hydrogen atmosphere at a sintering temperature of 1350° C. for 1.5 hours. Prepare the cathode, comprising the following steps:

[0039] A, the preparation of cathode base: direc...

Embodiment 3

[0044] A kind of cathode salt, the ratio of its raw material components is: BaCO 3 5. CaCO 3 0.7, Al 2 o 3 1.

[0045] A method for preparing the cathode salt, comprising the steps of:

[0046] 1) Weigh the analytically pure BaCO according to the formula quantity 3 98.7g, CaCO 3 7g, Al 2 o 3 10.2g, put the three materials into an agate jar, and take 5 agate balls with a diameter of 15mm and 4 agate balls with a diameter of 25mm, take 0.16L of pure water, conduct ball milling for 48 hours, and mix well;

[0047] 2) Take out the evenly mixed powder after ball milling from the agate jar, and dry it in an oven at 180°C for 12 hours to dry the powder;

[0048] 3) Press the powder into a block with a thickness of 10mm with a unit pressure of 0.8T / cm2;

[0049] 4) Sintering the pressed bulk powder in a dry hydrogen atmosphere at a sintering temperature of 1400° C. for 1 hour.

[0050] The preparation of ion bombardment resistant cathode comprises the following steps:

[00...

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Abstract

The invention discloses cathode salt, a preparation method thereof, a barium-tungsten cathode containing the cathode salt and a preparation method of the barium-tungsten cathode. The cathode salt contained in the cathode comprises BaCO3, CaCO3 and Al2O3, the substance amount ratio among the BaCO3, the CaCO3 and the Al2O3 is 4-5:0.4-0.7:1, and the preparation method of the cathode salt includes the steps of weighing, ball milling, briquetting and sintering. The preparation method of the barium-tungsten cathode containing the cathode salt includes: preparing a cathode substrate, preparing the cathode salt, dipping the cathode salt, lathing the cathode and laminating the emitting surface of the cathode. The barium-tungsten cathode prepared by the cathode salt is resistant to ion bombardment, the service life of microwave tubes is long, and each technical index can meet design requirements.

Description

technical field [0001] The invention relates to the technical field of microwave devices, in particular to a cathode salt and a preparation method thereof, a barium tungsten cathode containing the cathode salt and a preparation method thereof. Background technique [0002] In some microwave tubes, due to its working principle, some ions etc. are generated to bombard the cathode during the working process of the tube. In such a working environment, the cathode emitting surface needs to withstand bombardment in order to ensure the performance of the microwave tube. During the use of the existing barium tungsten cathode, after the emission surface is bombarded by ions, the emission current drops, and the technical indicators such as the power, pass rate, and life of the tube cannot meet the requirements. This phenomenon occurs. The main reason is that the cathode is not resistant to ion bombardment. After being bombarded by ions, the original normal emission state of the catho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J23/04H01J9/02B22F3/26
Inventor 吴华夏邓清东贺兆昌宋田英张丽
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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