Study On Preparation And Properties Of Coatings Of Anti-space Environment Atomic Oxygen And Anti-dielectric Charged

In-orbit spacecraft faces complicated space environments such as atomic oxygen erosion and charged particle radiation,which is harmful to sensitive materials and devices,leading to their degradation or even invalid.From the perspective of engineering application,this paper focuses on the preparation of organic-inorganic hybrid anti-atomic oxygen coatings and graphite conductive antistatic dielectric coatings.The purpose is to improve the reliability and service life of sensitive materials in orbit through the preparation of protective coatings.The main research results are as follows:1.NH2-POSS in-situ growth coating: The interfacial binding state of amino functional group and treated Kapton surface is studied systematically.At the same time,uniform and dense protective coating is prepared by in-situ growth.The atomic oxygen test showed that the organic-inorganic hybrid coatings can significantly increase anti-erosion ability of Kapton.The atomic oxygen corrosion rate of sample with the coating is much less than that of pristine Kapton.2.Preparation of modified graphite: In order to improve the dispersibility of graphite nano-powder in polymer and form film between graphite and polymer substrate through chemical bond,the graphite powder is modified.Firstly,the graphite powder was oxidized to generate functional groups such as hydroxyl group and carboxyl group.Subsequently,different modified graphite oxide powders(g-GO)were obtained by the surface modification of graphite oxide with different silane coupling agents.The modified g-GO has a resistivity of about 104 Ω·m.3.Preparation of composite coatings: Polyimide,epoxy resin and polyurethane as the polymer matrix,the prepared modified graphite(g-GO560,g-GO550)as conductive nanoparticles,and the composite coatings with adequate resistivity were prepared.Resistivity test showed that after adding a certain amount of modified graphite nanoparticle,the resistivity of the composite coating can reach the range of 109-1013Ω,which meets the demand of anti-internal charging.4.Study on the structure and surface properties of composite coatings: The surface morphology,mechanical properties,electrical conductivity and transmittance of the composites are studied.The results showed that all properties of the composites with modified graphite were improved,indicating excellent performance of composite coatings.