Abstract
In order to explore the influence of space ultraviolet radiation on spacecraft lubricating materials, an in-situ friction experimental device simulating space ultraviolet radiation was developed in the laboratory, and the experimental verification was carried out. This paper firstly introduced the design index, structure and working principle of the space ultraviolet irradiation simulation device, and then calibrated and tested the parameters of the whole device, and also conducted a virtual operation of the device’s operation effect by simulation software, and the results showed that it met the design index. Finally, the validation tested of the ultraviolet irradiated in-situ friction experimental device were described in detail. By using the device to irradiate the samples, it was found that the in-situ ultraviolet irradiation device could achieve the expected irradiation effect, and the irradiation would lead to changes in the surface structure and properties of the PTFE material, while also achieving the need for in-situ spatial friction property testing of the material, providing favorable conditions for future testing.
Highlights
Space equipment is subject to intense solar irradiation during orbit [1]
The device can be used in conjunction with the existing MSTS-1 vacuum friction and wear tester [20], which realizes the requirements for the simulation of space ultraviolet irradiation and the in-situ tribological performance test
The three-dimensional surface morphology of PTFE samples before and after UV irradiation was observed by Nanoscope V atomic force microscope (AFM)
Summary
Space equipment is subject to intense solar irradiation during orbit [1]. The spectrum of solar radiation includes electromagnetic waves with various wavelengths, ranging from 10−14 m for γ rays to 104 m for radio waves. The wavelength of vacuum ultraviolet ray used was 172 nm, and the irradiation intensity was 100 W/m2 , which was about 1 times the solar constant; Tokoroyaman [13,14] was used to test the UV radiation resistance of several carbon films. The device can be used in conjunction with the existing MSTS-1 vacuum friction and wear tester [20], which realizes the requirements for the simulation of space ultraviolet irradiation and the in-situ tribological performance test. In the last reference [24] the effect of gamma (γ) irradiation on Materials 2022, 15, 2063 organic polymer films, including 100–200 micrometer thick of PTFE copolymer. 10 mm by PVD (physical vapor deposition) method on both sides
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