Composite heater assembly and preparation method thereof

Abstract

The invention provides a composite heater assembly and a preparation method thereof. The method comprises the following steps: mixing insulating powder and metal powder to obtain mixed powder, and enabling the insulating powder and the metal powder to expand and contract synchronously; compacting the mixed powder to obtain a bar; sintering the bar to obtain a green body; turning the green body to obtain a composite heater (5); and bonding a cathode cylinder (2) and an electrode (7) to the two ends of the composite heater (5) through welding flux (6), so as to obtain the composite heater assembly. The preparation method disclosed by the invention is simple in process, and the cathode composite heater assembly which is high in reliability, small in size, high in efficiency, uniform in heating and free of a magnetic field can be prepared.

Description

technical field [0001] The disclosure relates to the technical field of microwave vacuum electronic devices, in particular to a composite thermal subassembly and a preparation method thereof. Background technique [0002] Microwave vacuum electronic devices are widely used in radar, satellite communications, electron accelerators, global positioning, controllable thermonuclear fusion, and high-power microwave weapons in the future military frontier. Their unique functions and superior performance, especially in high-power and In the case of high frequency band, it cannot be replaced by other devices. The part that heats the cathode in the microwave vacuum device is called the thermoson or the thermoson assembly. [0003] In recent years, the requirements of fast start-up and long life of microwave devices have posed higher technical challenges to the thermal performance, and it is necessary to do a lot of in-depth and meticulous research work on how to shorten the warm-up t...

AI Technical Summary

Problems solved by technology

However, this traditional heating method has some disadvantages: the preheating time of the cathode becomes longer; the heating efficiency is low; the working temperature of the heating element is high; the vibration and shock resistance is poor

However, this traditional thermal subassembly still has many defects, such as short circuit of the hot wire, large volume, insufficient thermal efficiency, magnetic field generated on the surface of the cathode, which affects the electron emission performance, etc.

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