Low absorption-radiation ratio thermal control coating on titanium alloy surface and preparation method thereof

Abstract

The invention relates to a thermal control coating with a low absorption-radiation ratio on the surface of a titanium alloy and a preparation method thereof, belonging to the technical field of thermal control coatings for spacecraft. The invention utilizes plasma electrolytic oxidation method to prepare, adopts sodium hypophosphite or potassium hypophosphite 5-20g / l, potassium water glass or sodium water glass 40-100g / l as electrolytic solution, adopts AC pulse power supply to control the titanium alloy In the oxidation process, the prepared coating is composed of silicon dioxide, which is composed of α-cristobalite and amorphous silicon oxide, and the two phases are mixed and distributed in the coating. The titanium alloy surface of the present invention has a low radiation absorption ratio heat control solar absorption ratio (in the solar radiation interval of 250-2500nm) is lower than 0.45, the hemispherical infrared radiation rate is greater than 0.8, and the ratio of the solar absorption ratio to the hemispherical infrared radiation rate is less than 0.5 , can adapt to the processing of the surface of parts with more complex structures, has high bonding strength with the substrate, and the coating has good space stability, which solves the problem of temperature control of spacecraft exposed to extraterrestrial titanium alloy parts.

Description

Low absorption-radiation ratio thermal control coating on titanium alloy surface and preparation method thereof technical field The invention relates to a thermal control coating with a low absorption-radiation ratio on the surface of a titanium alloy and a preparation method thereof, in particular to a coating and a preparation method for the thermal control of titanium alloy parts externally used in spacecraft, and belongs to the thermal control coating technology of spacecraft field. Background technique With the development of China's space technology, the functional requirements of space vehicles are becoming wider and wider, and the shapes of extraterrestrial equipment are becoming more and more complex. my country's spacecraft have increasingly strong demand for large-scale structures and mechanisms such as antennas. Large-scale structures and mechanisms will be used more and more in my country's future spacecraft. The temperature control of various moving parts of ...

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Problems solved by technology

The purpose of the present invention is to propose a low absorption-radiation ratio thermal control coating on the surface of titanium alloy and its preparation method in order to solve the above-mentioned problems, so as to solve the problem of thermal control of titanium alloy parts for external use in spacecraft

The low-absorption-radiation ratio thermal control coating on the surface of titanium alloy of the present invention is prepared by plasma electrolytic oxidation method

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