Collector composite structure for traveling wave tube and preparation method of collector composite structure

The invention provides a collector composite structure for a traveling wave tube and a preparation method thereof, and relates to the technical field of vacuum electronic devices. The method comprises the following steps: preparing an insulating cylinder made of a high-thermal-conductivity boron nitride material by adopting a chemical vapor deposition method, and carrying out secondary processing on redundant parts; a collector electrode made of a pyrolytic graphite material is prepared on the inner wall of the insulating cylinder by adopting a chemical vapor deposition method, so that the collector electrode is connected with the insulating cylinder, and redundant parts are secondarily processed; an electrode tail cover made of a pyrolytic graphite material is prepared by adopting a chemical vapor deposition method, and redundant parts are secondarily processed. According to the collector prepared by the method, vapor-deposited high-purity and high-density pyrolytic boron nitride and pyrolytic graphite are a