Semi-active heat protection structure and manufacturing method thereof

The invention relates to a semi-active heat protection structure and a manufacturing method thereof. The heat protection structure is constructed in a bearing structure and comprises a cover plate and a bottom plate, wherein the cover plate is connected with the bottom plate through diffusion brazing to form a closed structure; a steam flow channel is arranged in the bottom plate, and a plurality of capillary flow channels are arranged on a local surface of the steam flow channel; one end of the closed structure is provided with a vent hole, one end of the vent hole is communicated with the steam flow channel, and the other end is provided with a connector; a medium with the volume fraction of 30-60% is injected into the steam flow channel through the connector, and then the connector is sealed. The heat protection structure is advantaged int hat a diffusion brazing mode is adopted, so an integrated high-strength heat exchange structure can be constructed, the heat protection structure is suitable for manufac