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| CONTAMINATION AND EROSION OF MAGNESIUM FLUORIDE COATING OF DIFFUSIVE REFLECTION FLAKES BY NITROGEN TETRAOXIDE |
| Yonghua Shu;Hongli LiU;Jing Fan;Jiping Cui;Chong Xie |
| 中科院力学所高温气体动力学开放实验室 |
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Abstract This srticle, through measurement of diffusive reflectivity,X-ray photoelectron energy spectra and mass spectra,studies the contamination of magnesium fluoride(MgF2)coating diffusive reflection flakes by solid and gaseous nitrogen tetraoxide(N2O4).Our experiments show tha solid N2O4 may erode seriously the MgF2xoatings.The diffusive reflectivity of the coating surfaces,after contaminated by solid particles of N2O4,will decrease about 20%~30%.Within a certain period of time, the effects of gaseous N2O4 on MgF2coatings obviously depend upon its pressure.Exposure in N2O4 vapor for ten minutes,at the pressures of 6.9×104Pa and 200Pa,the 40μm coatings are almost disappeared for the former case,amd accompanied by about 20%decrese of the surface diffusive reflectivity,for the latter case there are a little changes in the atomic cinstitution and diffusive reflectivity of the coating surface.This article also provides the mole densit for absorption of N2O4 molecules on Mgf2 coating surfaces, and the probability for N2O4 molecules in collision with the surfaces to extract Ngf2 through a chemical absorption process.
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Received: 01 September 2003
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Corresponding Authors:
Yonghua Shu
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