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Aluminate for assembling barium-tungsten cathode of diode and preparation method thereof

A barium tungsten cathode and aluminate technology, which is applied in the field of diodes, can solve the problems of traveling wave tubes such as high requirements for diodes, poor anti-poisoning performance, low aluminate yield and pass rate, etc. The effect of strong poisoning performance and reasonable process design

Inactive Publication Date: 2011-11-16
NANJING SANLE ELECTRONICS INFORMATION IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aluminate is the active material of the aluminate barium tungsten cathode in the diode. The emission current of the barium tungsten cathode is mainly determined by the active material (aluminate). Therefore, the quality of the aluminate directly affects the quality of the barium tungsten cathode. The quality of the diode affects the quality of the entire diode, and the traveling wave tube has higher requirements for the diode. The aluminate disclosed in the prior art cannot meet the high requirements of the diode, and the assembled cathode has an emission current. Disadvantages such as low density, poor emission consistency, poor anti-poisoning performance and short cathode life
Moreover, the preparation method of aluminate provided by the prior art is not ideal in process design, the yield and pass rate of aluminate are low, and the prepared aluminate cannot meet the high requirements of the diode cathode required by the traveling wave tube.

Method used

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  • Aluminate for assembling barium-tungsten cathode of diode and preparation method thereof
  • Aluminate for assembling barium-tungsten cathode of diode and preparation method thereof
  • Aluminate for assembling barium-tungsten cathode of diode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] 1. Aluminate for assembly of barium tungsten cathode in diode, which is composed of the following molar fractions of raw materials:

[0054] Barium carbonate 5.8mol, calcium carbonate 1.2mol, aluminum hydroxide 4.0mol.

[0055] 2, the preparation method of the aluminate that barium tungsten cathode is assembled in the diode, it comprises the following steps:

[0056] (1) Barium carbonate, calcium carbonate and aluminum hydroxide were placed in a 160°C oven and baked for 24 hours, then accurately weighed barium carbonate 214.62g, calcium carbonate 22.52g and aluminum hydroxide 58.5 (the molar ratio was 5.8:1.2: 4.0) Put it into a ball mill jar, add 500ml of distilled water, and then put 8 agate balls with a diameter of 25mm, 14 agate balls with a diameter of 15mm, and 25 agate balls with a diameter of 10mm in the ball mill jar, and place them after sealing. Grind on a planetary ball mill with a rotation speed of 180 rpm for 4 hours, then pour the ball-milled powder into...

Embodiment 2

[0060] 1. Aluminate for assembly of barium tungsten cathode in diode, which is composed of the following molar fractions of raw materials:

[0061] Barium carbonate 5.6mol, calcium carbonate 1.4mol, aluminum hydroxide 4.0mol.

[0062] 2, the preparation method of the aluminate that barium tungsten cathode is assembled in the diode, it comprises the following steps:

[0063] (1) Place barium carbonate, calcium carbonate and aluminum hydroxide in an oven at 160°C for 24 hours, then accurately weigh 5.6 mol of barium carbonate, 1.4 mol of calcium carbonate and 4.0 mol of aluminum hydroxide and put them into a ball mill, add 500ml of distilled water, and then put 8 agate balls with a diameter of 25mm, 14 agate balls with a diameter of 15mm, and 25 agate balls with a diameter of 10mm in the ball mill jar, and place them on a planetary ball with a speed of 180 rpm after sealing. Grind on a ball mill for 4 hours, then pour the ball-milled powder into a porcelain plate, place it in a...

Embodiment 3

[0066] Example 3 Aluminate stability, consistency, anti-poisoning performance and service life test

[0067] 1. According to the method of Example 1 and Example 2, 4 batches of aluminate were prepared and loaded into tubes, and the stability and consistency of the emission performance were tested. The specific experimental results are shown in Table 7. And 4 batches of aluminates were tested for anti-poisoning performance (re-exposed the cathode of the secondary tube after the exhaust test to the atmosphere, and then tested after the secondary sealing and exhaust, and tested the change of the emission performance of the cathode after the above process. Measuring the anti-poisoning performance of aluminate) The specific experimental results are shown in Table 8.

[0068] Table 7 Emission stability and consistency test results of different batches of aluminates

[0069]

[0070] Table 8 Test results of anti-poisoning properties of different batches of aluminates

[0071] ...

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Abstract

The invention discloses aluminate for assembling barium-tungsten cathode of diode and a preparation method thereof. The aluminate is formed by 5.6 to 5.8 moles of barium carbonate, 1.2 to 1.4 moles of calcium carbonate and 4.0 moles of aluminium hydroxide. Experiment study indicates that the mixing ratio of the components is reasonable, that the prepared aluminate has high emission performance and high anti-poisoning performance, and that the service life of the assembled cathode is long. The preparation method of the aluminate has high operability and reasonable process design; and particularly, under optimal pressing mode, sintering temperature, sintering heat-preservation time, sintering atmosphere and the like, the preparation method can prepare the aluminate which has high emission performance and long service life and can meet requirements for high-standard traveling-wave diode cathode assembly.

Description

technical field [0001] The invention designs a diode in a traveling wave tube, and in particular relates to an aluminate used for assembling a barium-tungsten cathode in the diode and a preparation method thereof. Background technique [0002] Aluminate is the active material of the aluminate barium tungsten cathode in the diode. The emission current of the barium tungsten cathode is mainly determined by the active material (aluminate). Therefore, the quality of the aluminate directly affects the quality of the barium tungsten cathode. The quality of the diode affects the quality of the entire diode, and the traveling wave tube has higher requirements for the diode. The aluminate disclosed in the prior art cannot meet the high requirements of the diode, and the assembled cathode has an emission current. Low density, poor emission consistency, poor anti-poisoning performance and short life of the cathode. Moreover, the process design of the aluminate preparation method provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16
Inventor 马静王玉春赵清武元元
Owner NANJING SANLE ELECTRONICS INFORMATION IND GRP
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