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Rhenium doped tungsten-based alloy cathode and preparation method thereof

A tungsten-based alloy, tungsten-rhenium alloy technology, applied in the field of electric vacuum, can solve the problem of fast evaporation on the cathode surface

Inactive Publication Date: 2016-06-22
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, when the high-power continuous wave magnetron guarantees normal output power, its cathode generally works at a temperature between 2450-2700K. Excessively high cathode operating temperature causes the surface of the cathode to evaporate too quickly. When the diameter of the cathode is lower than the initial At 90% of the diameter, the life of the cathode is declared to be over

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  • Rhenium doped tungsten-based alloy cathode and preparation method thereof
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  • Rhenium doped tungsten-based alloy cathode and preparation method thereof

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0019] The invention discloses a rhenium-doped tungsten-based alloy cathode. The alloy cathode uses 5wt% rhenium-doped tungsten-rhenium alloy as an electron emission material. It is prepared by sintering in a hydrogen furnace. The rhenium-doped tungsten-based alloy cathode can be used in high-power continuous wave magnetrons, and the current life on the life table has exceeded 2000 hours.

[0020] The invention also discloses a preparation method of a rhenium-doped tungsten-based alloy cathode, which comprises the following steps:

[0021] a. After mixing metal W powder and Re powder, grind for 24 hours to obtain evenly mixed tungsten-rhenium alloy powder;

[0022] b. After uniformly mixing the uniformly mixed tungsten-...

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Abstract

The invention provides a preparation method of a rhenium doped tungsten-based alloy cathode. The preparation method comprises the steps of: mixing metal tungsten powder with rhenium powder to obtain evenly mixed tungsten-rhenium alloy powder; mixing the tungsten-rhenium alloy powder with 1.5wt% nitro-cotton solution evenly, applying the mixed solution to the surface of a tungsten cathode substrate, and baking; and placing a tungsten wire with the tungsten-rhenium alloy powder applied on surface into a high-temperature hydrogen furnace, and keeping the tungsten wire at the temperature of 1600+ / -50 DEG C for 10-15 minutes, thereby preparing the rhenium doped tungsten-based alloy cathode. The invention further provides the rhenium doped tungsten-based alloy cathode prepared by adopting the method. The rhenium doped tungsten-based alloy cathode provided by the invention can increase emission current density of a pure tungsten cathode used for a high-power continuous wave magnetron, reduce working temperature of the pure tungsten cathode, reducing surface evaporation rate of the cathode, and further prolonging service life of the cathode.

Description

technical field [0001] The invention belongs to the field of electric vacuum technology, and more specifically relates to a rhenium-doped tungsten-based alloy cathode and a preparation method thereof. Pure tungsten wire cathode can increase the emission current density of the cathode, reduce the working temperature of the cathode and prolong the life of the cathode. Background technique [0002] With the development of magnetrons towards high output power, ordinary oxide cathodes, barium tungsten cathodes, etc. cannot be used because they are not resistant to anode high voltage, electron and ion bombardment, and are prone to electric sparks. Therefore, carbonized thoriated tungsten cathodes are used in medium power (less than 3KW) magnetrons. In high-power (greater than 10KW) continuous wave magnetrons with high anode voltage (greater than 10kV), direct-heating pure tungsten (W) wire cathodes with small emissivity are generally used. Compared with ordinary oxides, pure W wi...

Claims

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Application Information

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IPC IPC(8): H01J9/02H01J23/04
Inventor 漆世锴王小霞罗积润胡明炜赵青兰李云张琪
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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