Application of Laser Vacuum Ultraviolet Radiation Simulation and Its Influence on Polymer Materials Jiang Lixiang Liu Zhen (Harbin Institute of Technology Space Materials and Cup Project. Not only the energy spectrum is extremely close and the energy is greater than the actual solar far-ultraviolet radiation energy (curve 1). It is the main requirement for ground simulation that the radiation intensity is continuously adjustable between 07024W/m2, the error is minimal, 0.08, the instability rate is 1.3%, the beam intensity is 24mA, and the electron energy is also equal to lkeV. Simulate high vacuum (icr5Pa) and low temperature (test operating temperature 20K) conditions in the space environment.
Effects of Vacuum Ultraviolet Radiation on the Properties of Polymer Materials We used the jet vacuum vacuum ultraviolet radiation simulation equipment to perform the following tasks: 1 Influence of vacuum ultraviolet irradiation on the performance of solid lubricant coatings Using VUV to simulate actual space exposure for 80 hours and 300 hours The radiation dose irradiates the MS2 coating of organic matrix materials (silicone and epoxy) and inorganic matrix material (sodium silicate). Test vacuum is l (T3Pa, test temperature is 20K. The test results show (see), the effect of vacuum ultraviolet radiation on the life of MS2 coating is related to the matrix material. For silicone and epoxy matrix materials, vacuum ultraviolet radiation causes coating. The life of the layer is reduced; for the sodium silicate matrix material, the lifetime of the coating is increased, and the longer the irradiation time is, the more obvious the increase is.
Lifespan of MS2+Organic Gui with Different Matrix MoS2 Coatings under Vacuum Ultraviolet Radiation 2. Effect of Vacuum Ultraviolet Radiation on the Damage Properties of Carbon (Graphite)/Epoxy Composites Using VUV to Simulate the Actual Space Exposure for Half a Year, One Year, and Two Years The carbon (graphite)/epoxy composite (CF/EP) was irradiated at the dose. Test vacuum is l (T3Pa, test temperature is 20K. Test results show (see), CF / EP has a significant mass loss, and with the radiation time prolonged, the quality of damage increases. Through the optical microscope and SEM observation of irradiation The surface of the sample after the test found that CF/EP fibers and the surface of the substrate were significantly damaged, some of the fibers were cracked, and the test surface changed from the pre-irradiation rich fat to the post-irradiation fat-reduced fat, which may have caused the damage. The main reason.At the same time, the mechanical properties of CF/EP after irradiation have also been reduced to varying degrees, which is consistent with the experimental results of foreign test satellites, which shows that the destruction of CF/EP by vacuum ultraviolet radiation. It is necessary to carry out deep research.
3. Effect of vacuum ultraviolet radiation on the mechanical properties of polyimide light-absorbing coatings + Solar electromagnetic radiation (wavelength 2002500 nm) Simulated actual space exposure conditions The polyimide light-absorbing coating was irradiated and its mechanical properties were observed. The structure and composition of the sample are as shown. The radiation conditions used were: vacuum ultraviolet radiation one year dose, vacuum ultraviolet + solar radiation for one hour, working temperature 300K and 77K, vacuum degree 103Pa. Test results show (see), vacuum ultraviolet radiation coating mechanical properties Have a certain influence. When the temperature changed from 300K to 77K, the yield strength and breaking strength of the material increased dramatically, indicating that the vacuum ultraviolet irradiation and temperature alternation had a significant effect on the tensile properties of the material. This must be considered when designing and manufacturing spacecraft light absorbing coatings.
Polyimide light-absorbing coating stress-strain curve Creep properties of polyethylene film and rubber film VUV was used to irradiate polyethylene film and rubber film for spacecraft, and its creep performance was observed. Test conditions: Simulated radiation exposure in actual space for 2000 hours.
In the case of radiation, the creep performance test was performed on a low temperature tensile tester 3-71, vacuum degree 1-33, fixed load: polyethylene 3.9 MPa, rubber 0 44 MPa. Visible, at time q the deformation rate reached saturation. When radiation is started, radiation causes additional deformation of the two materials, polyethylene deformation is positive (elongation), and rubber deformation is negative (shrinkage). After radiation is stopped at time t2, deformation cannot be recovered, and both materials have some residual Deformation e, and eb. (a) Polyethylene film (thickness 0.04mm) (b) Rubber film (thickness 0.07mm) Effect of vacuum ultraviolet radiation on the creep properties of polyethylene film and rubber film. (t1: radiation begins when the deformation rate reaches saturation> stop radiation).
From the results of the above preliminary experiments, it can be seen that the influence of vacuum ultraviolet radiation on space materials, especially polymer materials, cannot be ignored and must be studied in depth. After understanding the damage effects of vacuum ultraviolet on space materials, we must further study the mechanism of damage and propose effective measures to improve the design, manufacture, and selection of space materials.
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