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Preparation method of high-power and long-life cathode heater assembly

A long-life, high-power technology, applied in cold cathode manufacturing, thermal electron cathode manufacturing, electrode system manufacturing, etc., can solve the problems of no improvement and improvement, and achieve the effects of shortened start-up time, uniform temperature distribution, and firm fixation

Active Publication Date: 2019-04-26
湖北汉光科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the design structure of the cathode heater later adopts double helix, folded type and coil type, which has certain effects on vacuum electronic devices with low power and life requirements, but for high power and long life vacuum electronic devices, there is no fundamental to improve and enhance

Method used

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  • Preparation method of high-power and long-life cathode heater assembly
  • Preparation method of high-power and long-life cathode heater assembly
  • Preparation method of high-power and long-life cathode heater assembly

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The preparation method of the high-power and long-life cathode heater assembly in this embodiment includes the following steps:

[0032] 1) In order to improve the mechanical strength of the heating wire, choose a rhenium tungsten wire with a diameter of 0.90-0.95mm (preferably 0.92mm). Compared with tungsten wire, rhenium tungsten wire has higher resistivity and better ductility Well, the recrystallization temperature should be as high as 150-200°C; and its tensile strength is several times higher than that of pure tungsten wire, and its interaction with alumina coating is weak; in high-power vacuum electronic devices, due to the effect of strong magnetic field , Excessive initial current, due to the influence of mechanical force, may cause the welding spot of the hot wire to be soldered or fall off. Therefore, in high-power v...

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Abstract

The invention discloses a method for preparing a high-power and long-life cathode heater assembly. A rhenium tungsten wire is used to wind a double-headed double-helical cylindrical heating wire prefabricated part, and the double-ended double-helical cylindrical hot wire prefabricated part is placed on the The double-headed double-helix cylindrical hot wire is formed on the semi-cylindrical hot wire forming die, and the double-headed double-helical cylindrical hot wire is put into the ring-shaped cavity mold and the pitch is evenly arranged and bent into a circle to form a prefabricated part of the hot part. The parts are blackened, coated with an insulating layer and sintered in turn to make the required heater, and the space between the cathode and the heater is filled with ceramic filler, and then sintered to form the cathode heater assembly. The double-headed double-helix and ring structure overcomes the problem of uneven axial temperature distribution of the cathode caused by the cold-end effect at both ends of the cathode in the previous double-helix filament cathode. The surface temperature of the cathode is evenly distributed, and the temperature of the cathode operating point can be reduced; The obtained cathode heating subassembly can shorten the start-up time of the cathode by about half and reduce the heating power of the cathode.

Description

technical field [0001] The invention relates to the field of high-power vacuum electronic devices, in particular to a method for preparing a high-power and long-life cathode heater assembly. Background technique [0002] In the prior art, there are single-helix, double-helix, folded and coiled-type structures for cathode heaters in high-power vacuum electronic devices. When looking for the cause of the end of the life of high-power vacuum electronic devices, it is usually not due to the exhaustion of active materials, but the damage of the hot wire, which is due to the magnetic field generated by the alternating thermal sub-power supply and the axial magnetic field of the vacuum electronic device. The interaction causes the hot wire to be subjected to an alternating mechanical force. Obviously, the greater the current of the heating wire, the greater the interaction force, the greater the vibration frequency of the heating wire, the easier it will be damaged after long-term...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/16H01J9/04
CPCH01J1/16H01J9/04H01J9/042
Inventor 何屹
Owner 湖北汉光科技股份有限公司
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