Polymer materials commonly employed in low Earth orbit(LEO)environments are highly susceptible to atomic oxygen(AO)attack,leading to severe degradation and deterioration of their properties.To address this challenge,3...Polymer materials commonly employed in low Earth orbit(LEO)environments are highly susceptible to atomic oxygen(AO)attack,leading to severe degradation and deterioration of their properties.To address this challenge,3-glycidyloxypropyltrimethoxysilane-modified hexagonal boron nitride(h-BN@KH560)nanohybrids were synthesized and incorporated into epoxy(EP)composites to enhance their AO erosion resistance.The resulting hexagonal boron nitride-based epoxy nanocomposites(FBN/EP)were systematically evaluated for their tribological performance and AO erosion resistance using a series of characterization techniques.The results demonstrated that the incorporation of h-BN@KH560 nanohybrids significantly improved the wear resistance and AO erosion resistance of the EP matrix.Specific ally,the FBN_(1.0)/EP nanocomposite exhibited an 86.1%reduction in wear rate compared to pure EP,while FBN_(5.0)/EP nanocomposite achieved optimal AO erosion resistance,with a minimal erosion rate of 3.58×10^(-24)cm^(3)atoms^(-1)at an AO dose of 1.2×10^(21)atoms cm^(-2).These findings indicate that the incorporating content-induced distribution of h-BN@KH560 within the EP matrix strongly influences the wear resistance of FBN/EP nanocomposites,but there is a relatively minor effect on their AO erosion resistance.The enhanced AO erosion resistance is attributed to the synergistic barrier protection provided by h-BN@KH560 and the formed B_(2)O_(3)and SiO_(2)layers under AO irradiation.This study offers a promising strategy for extending the service life of epoxy nanocomposites in harsh LEO environments.展开更多
In order to investigate the effect of space environmental factors on spacecraft materials, a ground-based simulation facility for space atomic oxygen（AO） irradiation was developed in our laboratory. Some Kapton film...In order to investigate the effect of space environmental factors on spacecraft materials, a ground-based simulation facility for space atomic oxygen（AO） irradiation was developed in our laboratory. Some Kapton film samples were subjected to AO beam generated by this facility. The Kapton films before and after AO exposure were analyzed comparatively using optical microscopy, scanning electronic microscopy, atomic force microscopy, high-precision microbalance, and X-ray photoelectron spectroscopy. The experimental results indicate that the transmittance of Kapton film will be reduced by AO irradiation notably, and its color deepens from pale yellow to brown. Surface roughness of the AO-treated sample is already increased obviously after AO irradiation for 5 hours, and exhibits a flannel-like appearance after 15 hours’ exposure in AO beam. The imide rings and benzene rings in kapton molecule are partially decomposed, and some new bonds form during AO irradiation. The mass loss of kapton film increases linearly with the increase of AO fluence, which is resulted from the formation of volatile products, such as CO, CO2 and NOx. The breakage in structure and degradation in properties of AO-treated Kapton film can be attributed to the integrated effect ofimpaction and oxidization of AO beam. The test results agree well with the space flight experimental data.展开更多
基金financially supported by Natural Science Foundation of Zhejiang Province(No.LY23E050004)Ningbo City’s Key Technology Breakthrough Plan for“Science and Technology Innovation Yongjiang 2035(No.2024Z133)+1 种基金the National Natural Science Foundation of China(No.52375220)the Natural Science Foundation of Ningbo Municipality(No.2024QL021)
文摘Polymer materials commonly employed in low Earth orbit(LEO)environments are highly susceptible to atomic oxygen(AO)attack,leading to severe degradation and deterioration of their properties.To address this challenge,3-glycidyloxypropyltrimethoxysilane-modified hexagonal boron nitride(h-BN@KH560)nanohybrids were synthesized and incorporated into epoxy(EP)composites to enhance their AO erosion resistance.The resulting hexagonal boron nitride-based epoxy nanocomposites(FBN/EP)were systematically evaluated for their tribological performance and AO erosion resistance using a series of characterization techniques.The results demonstrated that the incorporation of h-BN@KH560 nanohybrids significantly improved the wear resistance and AO erosion resistance of the EP matrix.Specific ally,the FBN_(1.0)/EP nanocomposite exhibited an 86.1%reduction in wear rate compared to pure EP,while FBN_(5.0)/EP nanocomposite achieved optimal AO erosion resistance,with a minimal erosion rate of 3.58×10^(-24)cm^(3)atoms^(-1)at an AO dose of 1.2×10^(21)atoms cm^(-2).These findings indicate that the incorporating content-induced distribution of h-BN@KH560 within the EP matrix strongly influences the wear resistance of FBN/EP nanocomposites,but there is a relatively minor effect on their AO erosion resistance.The enhanced AO erosion resistance is attributed to the synergistic barrier protection provided by h-BN@KH560 and the formed B_(2)O_(3)and SiO_(2)layers under AO irradiation.This study offers a promising strategy for extending the service life of epoxy nanocomposites in harsh LEO environments.
基金Funded by the Distinguished Young Scholars of NSFC(51125023)the Major State Basic Research Development Programof China(2011CB013405)the Natural Science Foundation of Beijing City(3120001)
文摘In order to investigate the effect of space environmental factors on spacecraft materials, a ground-based simulation facility for space atomic oxygen（AO） irradiation was developed in our laboratory. Some Kapton film samples were subjected to AO beam generated by this facility. The Kapton films before and after AO exposure were analyzed comparatively using optical microscopy, scanning electronic microscopy, atomic force microscopy, high-precision microbalance, and X-ray photoelectron spectroscopy. The experimental results indicate that the transmittance of Kapton film will be reduced by AO irradiation notably, and its color deepens from pale yellow to brown. Surface roughness of the AO-treated sample is already increased obviously after AO irradiation for 5 hours, and exhibits a flannel-like appearance after 15 hours’ exposure in AO beam. The imide rings and benzene rings in kapton molecule are partially decomposed, and some new bonds form during AO irradiation. The mass loss of kapton film increases linearly with the increase of AO fluence, which is resulted from the formation of volatile products, such as CO, CO2 and NOx. The breakage in structure and degradation in properties of AO-treated Kapton film can be attributed to the integrated effect ofimpaction and oxidization of AO beam. The test results agree well with the space flight experimental data.
