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A cathode heating subassembly and its preparation method

A heater and assembly technology, applied in the field of cathode heater assembly and its preparation, can solve the problems of complex preparation process, long preheating time, poor reliability, etc., and achieve high heating temperature, short preheating time, and increased volume Effect

Active Publication Date: 2021-12-07
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this traditional cathode heating subassembly has many defects, such as long warm-up time, poor reliability, large volume, low efficiency, magnetic field, complicated preparation process, etc.

Method used

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  • A cathode heating subassembly and its preparation method
  • A cathode heating subassembly and its preparation method
  • A cathode heating subassembly and its preparation method

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preparation example Construction

[0027] The embodiment of the present invention provides a preparation method of a cathode heater subassembly, the preparation method includes: cutting a metal sheet with a preset thickness to obtain a rectangular metal strip, and using the rectangular metal strip as the heater 5; The heater 5 is welded to the surface of the cathode base 1 , which is the surface opposite to the emission surface of the cathode base 1 . that is figure 2 In the viewing angle shown, the upper surface of the cathode substrate 1 is the emitting surface, and the lower surface is the surface opposite to the emitting surface. At this time, the heater 5 is welded to the lower surface of the cathode substrate 1 .

[0028] In the present invention, the following conditions must be satisfied as the metal strip material: 1. The evaporation rate is small at the working temperature or the high temperature required in the treatment process. 2. The expansion coefficient is similar to that of the cathode metal...

Embodiment 1

[0039] This embodiment provides a cathode heater subassembly, see figure 2 , the assembly includes: a cathode, and a heater 5 welded on the back surface of the cathode; wherein, the cathode comprises a cathode substrate 1, the heater 5 is welded on the surface of the cathode substrate 1, and the heater 5 The thickness of the heater 5 is 0.05mm, the width of the heater 5 is 2mm consistent with the diameter of the cathode substrate 1 , and the length of the heater 5 is 3.5 times the diameter of the cathode substrate 1 . The material of the heater 5 is tungsten.

Embodiment 2

[0040] Embodiment 2: This embodiment provides a method for preparing a cathode heater subassembly. The method includes the following steps:

[0041] Step 1. Cut a tantalum metal sheet with a thickness of 0.05mm into a heater of the required size, a strip-shaped metal strip (ie a rectangular metal strip); the width of the metal strip is the same as the cathode size, which is 2mm; the length is the diameter of the cathode. 3.5 times, which is 7mm. The metal strip is the heater.

[0042] Step 1. Weld the cathode base with a diameter of 2 mm on the metal strip by laser welding.

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Abstract

The invention provides a cathode thermal subassembly and a preparation method thereof. The preparation method includes: cutting a metal sheet with a preset thickness to obtain a rectangular metal strip, and using the rectangular metal strip as a heater; welding the heater to the surface of the cathode base, which is connected to the cathode base The surface opposite to the emitting surface. The cathode heating subassembly of the present invention has a simple structure, and the prepared cathode heating subassembly has high yield, short preheating time, no short circuit, small volume, high thermal efficiency, high heating temperature, uniform heating, good vibration resistance, and thermal shock resistance The utility model has the advantages of good performance, high reliability and simple manufacturing method.

Description

technical field [0001] The invention relates to the technical field of microwave devices, in particular to a cathode heater subassembly and a preparation method thereof. Background technique [0002] Microwave vacuum electronic devices are widely used in radar, satellite communication, electron accelerators, global positioning, controllable thermonuclear fusion and high-power microwave weapons in the future military frontier. In the case of high frequency band, it cannot be replaced by other devices. After decades of development, although the theory of conventional microwave vacuum electronic devices and related technologies has basically matured, modern high-tech microwave devices continue to put forward new development requirements for the power, frequency, bandwidth and other operating characteristics of microwave signals. These demands are mainly manifested in the requirement of higher frequency, higher power, wider frequency band, higher efficiency and new working char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/04H01J9/08H01J1/22H01J1/146
CPCH01J1/146H01J1/22H01J9/04H01J9/08
Inventor 刘燕文王国建田宏朱虹李芬孟鸣凤赵恒邦谷兵
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI