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Scandium-containing aluminate for impregnated diffusion cathode and preparation method thereof

A diffusion cathode and aluminate technology, which is applied to the cathode of the transit time type electron tube, can solve problems affecting reliability, recognition, and the difference in cathode electron emission performance, and achieve the effect of easy mass production

Active Publication Date: 2018-12-18
四川杰诺创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a simple process and is consistent with the traditional impregnated diffusion cathode. However, the lack of understanding of the composition and crystal structure of scandium-containing aluminate has led to differences in the electron emission performance of the cathode, which in turn affects the reliability of practical applications.

Method used

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  • Scandium-containing aluminate for impregnated diffusion cathode and preparation method thereof
  • Scandium-containing aluminate for impregnated diffusion cathode and preparation method thereof
  • Scandium-containing aluminate for impregnated diffusion cathode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Preparation and electron emission performance of 5:1:2 aluminate

[0026] Preparation of the cathode: the cathode substrate is made of tungsten sponge with 25% pores, the cathode substrate and the molybdenum support cylinder are brazed with molybdenum ruthenium solder at high temperature (1995°C), the heater is placed in the molybdenum support cylinder, and the aluminum oxide powder is filled. High-temperature sintering (1750°C), the emission material is 5:1:2 aluminate, the cathode substrate is placed upside down in the emission material, and the temperature is raised to 1700°C in a hydrogen furnace for impregnation. After the impregnation, the residual salt on the surface is removed, and finally the into a test cathode.

[0027] Measurement of electron emission performance: the cathode is tested for electron emission capability in a water-cooled copper anode diode device, the test mode adopts DC mode, and the test temperature is 1100°C B (brightness tem...

Embodiment 2

[0028] Example 2: Add 3wt.% Sc in 5:1:2 aluminate 2 o 3 post electron emission performance

[0029] Experimental conditions: Add 3wt.% scandium oxide to the 5:1:2 aluminate composition, after the raw materials are mixed and pressed and pressed, the sintering temperature is 1350°C in a high-temperature muffle furnace, and the heating rate is 10°C / min , the holding time is 200 minutes, and finally the scandium-containing aluminate is formed. The three scandium-containing aluminates were ground into powders and subjected to powder X-ray diffraction analysis respectively. The conditions of diffraction data collection are: sampling time 1 second, sampling step width 0.02°, and Bragg diffraction angle range from 15° to 80°.

[0030] The X-ray diffraction data are attached figure 1 . Through the comparison of phase analysis software, it can be seen that all scandium-containing aluminates contain Ba 3 al 2 o 6 and Ba 2 ScAlO 5 . Most importantly, Ba 3 al 2 o 6 and Ba 2 ...

Embodiment 3

[0032] Example 3: Add 5wt.% Sc in 5:1:2 aluminate 2 o 3 post electron emission performance

[0033] The experimental conditions are the same as in Example 2, the difference is that 5wt.% Sc is added to the 5:1:2 aluminate 2 o 3 .

[0034] The preparation of the cathode and the measurement of the electron emission capability were the same as in Example 1. attached Figure 4 Add 5wt.% Sc to impregnate 5:1:2 aluminate 2 o 3 The DC emission current density of the cathode (unit A / cm 2 ) and voltage (unit V) log logarithmic plot. It can be seen from the figure that the emission current density of the deviation point reaches 9.6A / cm 2 .

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Abstract

The invention discloses a scandium-containing aluminate for impregnating diffusion cathodes and a preparation method thereof, belonging to the field of manufacturing of microwave electron tubes. A proper amount of scandium oxide (accounting for 3-7 wt.% of total mass) is added into 5:1:2 aluminate to obtain a two-phase structure containing Ba3Al2O6 and Ba2ScAlO5, so that the cathode impregnated with the scandium-containing aluminate has high current density emission. The preparation method is simple and easy to operate, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of microwave electric vacuum device manufacture, and in particular relates to a method for preparing scandium-containing aluminate for impregnating and diffusing hot cathodes. Background technique [0002] Vacuum electronic devices play an important role in information systems and national defense equipment, and the research on vacuum electronic devices is expanding to the millimeter wave, submillimeter wave and even terahertz regions. As the core component of such devices, the cathode has higher and higher performance requirements. As the electron emission source of the vacuum device, the performance of the cathode has a crucial influence on the power output, stability, reliability and lifetime of the device. Several important indicators in the cathode work are: low cathode operating temperature, high emission current density, high reliability, long cathode life, short preheating and start-up time, etc. Among them,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J23/04C04B35/44C04B35/622
CPCC04B35/44C04B35/622C04B2235/3208C04B2235/3215C04B2235/3217H01J23/04
Inventor 付浩商亚粉郑强胥麟姚徐成永东罗勇
Owner 四川杰诺创科技有限公司