A kind of intelligent thermal control device and its preparation method

Abstract

The invention discloses an intelligent thermal control device. The intelligent thermal control device adopts the multi-layer composite structure comprising a reflecting layer, a dielectric layer, a phase change layer and an absorptivity adjusting and controlling layer sequentially from bottom to top; and the multi-layer composite structure is located on a base layer. A preparation method of the intelligent thermal control device includes steps as follows: (1) the reflecting layer is prepared on a base with the physical vapor deposition method; (2) the dielectric layer is prepared on the surface of the reflecting layer with the physical vapor deposition method; (3) the vanadium dioxide thin-film phase change layer is prepared on the surface of the dielectric layer with the magnetron sputtering method; (4) the phase change layer is covered with the absorptivity adjusting and controlling layer, and then the intelligent thermal control device is obtained. The prepared intelligent thermal control device has the large emissivity change range and has the good temperature adjusting and controlling effects, the corresponding high emissivity at the high temperature is higher than 0.8, the area of the thermal control device is reduced favorably, and the function density is increased; and meanwhile, the sunlight absorptivity is lower than 0.3, the intelligent adjusting ability of the device can be guaranteed, and the actual demand for thermal control of a space vehicle can be basically satisfied.

Description

technical field [0001] The invention belongs to the technical field of spacecraft thermal control, and in particular relates to an intelligent thermal control device and a preparation method thereof. Background technique [0002] In the orbital space environment, the main heat exchange method between the interior of the spacecraft and the outer space environment is thermal radiation. Due to the large fluctuation range of external ambient temperature, effective thermal control technology must be adopted in order to keep the temperature inside the spacecraft in a suitable range and ensure the normal operation of various equipment components. At present, the thermal control methods used on spacecraft mainly use complex devices such as thermal control coatings, louvers, and heat pipes. However, these devices have disadvantages such as large volume and weight, high energy consumption, and complex mechanical moving devices, which seriously affect the spacecraft. limited load capa...

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Problems solved by technology

However, when the sun is shining, the high solar absorptivity will cause the temperature of the device to rise sharply, thus losing the ability to intelligently adjust the temperature of the spacecraft components. solar absorptivity

However, the emissivity variation of existing intelligent thermal control devices is still relatively small, the solar absorption rate is high, and the complex structure makes the preparation process more difficult, and it is difficult to meet the actual needs of spacecraft thermal control.

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