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Lanthanum-carbide-tungsten hot cathode material and preparation method thereof

A technology of lanthanum carbide and hot cathodes, which is applied in the manufacture of hot electron cathodes, electrical components, and parts of discharge tubes/lamps, etc., can solve problems such as complex procedures, non-hot cathode materials, serious brittleness, etc., and achieve simple preparation methods, The effect of good thermal electron emission capability and high emission stability performance

Inactive Publication Date: 2013-04-10
BEIJING UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0002] At present, the century-old W-ThO is still used in medium and high power tubes. 2 cathode, due to W-ThO 2 The radioactive contamination and severe brittleness of the cathode after carbonization suggest that it is not an ideal hot cathode material
[0003] Studies have shown that the emission performance of the cathode can be greatly improved in the carbonization of rare earth oxide-tungsten and molybdenum cathodes, but this method requires the rare earth oxide-tungsten and molybdenum cathodes to Carry out carbonization treatment, the process is complicated

Method used

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  • Lanthanum-carbide-tungsten hot cathode material and preparation method thereof
  • Lanthanum-carbide-tungsten hot cathode material and preparation method thereof
  • Lanthanum-carbide-tungsten hot cathode material and preparation method thereof

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Embodiment Construction

[0012] specific implementation plan

[0013] Example 1, put 16 grams of lanthanum hydride and 2 grams of graphite into a vacuum ball mill jar under the protection of an argon atmosphere, and then put the pellets in a ratio of 1:1. Put it on the ball mill and mill it for two hours at a speed of 800rpm. After the time is up, put it into a vacuum melting furnace and heat it to 1200°C for 30 minutes. Weigh 57 grams of tungsten powder, take 3 grams of lanthanum carbide and the weighed tungsten powder and put them into a ball mill jar, then put the ball material in a ratio of 1:1, and put it on the ball mill at a speed of 400rpm Ball mill for two hours. After the ball milling is completed, put the powder into a Φ20mm grinding tool, and sinter on a spark plasma sintering equipment with a pressure of 20MP and a temperature of 1000°C for 10 minutes. The sintered sample was machined into a cylinder with a diameter of 3 mm and a height of 2.8 mm by locomotive machining, and activated ...

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Abstract

The invention discloses a lanthanum-carbide-tungsten hot cathode material and a preparation method thereof, belonging to the technical field of cathode materials of refractory metals. The lanthanum-carbide-tungsten hot cathode material is characterized by containing La2C3 and metallic tungsten powder, wherein the content of lanthanum carbide accounts for 5%-20% of the total weight of the material. The preparation method comprises the following steps of: mixing lanthanum hydride powder and graphite powder with the mass ratio of 8: 1 uniformly under protection of argon atmosphere, putting the mixture in a vacuum furnace, heating to 1200 DEG C, preserving the heat for 30 minutes and obtaining a product La2C3; mixing the prepared La2C3 and the tungsten powder uniformly in vacuum by using a ball milling method, then putting the powder in a grinding tool and using ion sintering methods such as discharging and the like to carry out sintering; and adopting a locomotive processing method to prepare the needed cathode. In the lanthanum-carbide-tungsten hot cathode material, the preparation process is simple, the heat emission performance is good and the emission stability is good.

Description

technical field [0001] The invention relates to a lanthanum carbide-tungsten hot cathode and a preparation method thereof, belonging to cathode material preparation. Background technique [0002] At present, the century-old W-ThO is still used in medium and high power tubes. 2 cathode, due to W-ThO 2 The radioactive contamination and severe brittleness of the cathode after carbonization indicate that it is not an ideal hot cathode material. [0003] Studies have shown that the emission performance of the cathode can be greatly improved in the carbonization of rare earth oxide-tungsten and molybdenum cathodes, but this method requires the rare earth oxide-tungsten and molybdenum cathodes to Carry out carbonization treatment, the procedure is complicated. In this study, a new type of lanthanum carbide-tungsten cathode material was prepared by directly adding lanthanum carbide to the tungsten matrix by powder metallurgy, and the process is simple. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/148H01J9/04
Inventor 王金淑刘伟李常才崔云涛张喜珠杨帆王茜王凯风周美玲左铁镛
Owner BEIJING UNIV OF TECH
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