The alignment of the glass elements from Radiation-Resistant optical glass K-208 for thermal control coatings of spacecraftстатья Исследовательская статья

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Дата последнего поиска статьи во внешних источниках: 16 ноября 2017 г.

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[1] The alignment of the glass elements from radiation-resistant optical glass k-208 for thermal control coatings of spacecraft / P. A. Vyatlev, D. V. Sergeev, V. N. Sigaev et al. // Letters on materials. — 2017. — Vol. 7, no. 1. — P. 64–67. Optical coatings, i.e. elements of temperature controlling coatings, based on ultrathin elements of optical radiation-resistant glass K-208 with thickness of about 150 μm, are successfully used as passive means of temperature controlling tools in space engineering. The paper considers the process of fabrication of glass elements for temperature controlling coatings, which includes the following stages: drawing of glass ribbon from a brick of glass heated to a temperature of high plastic consistency through a steel draw-hole; dimensional cutting of the glass ribbon that is done by means of a diamond scriber; process of thermal plastic flattening of glass elements done in a furnace by heating to a temperature of plastic consistency under load. The process of drawing from a highly plastic brick of large sizes leads to difficulties in providing the flatness of the ribbon drawn. The glass ribbon has a convex shape. In order to achieve a required deviation from the flatness, the technique of warm plastic deformation of the glass elements under load is used. The process of flattening of convex glass elements is considered, temperature regimes and holding time, which allow one to achieve minimum deviations from the flatness (below 10 μm) are chosen. Measurements of flatness deviations of glass elements before and after flattening are carried out by a profile recorder 252 “Caliber”. The results of the measurements prove the efficiency of the flattening technique chosen. The flattening process makes it possible to fabricate thin elements of K-208 glass with minimum flatness deviations that allows for their application in the units of temperature controlling coatings in the temperature controlling systems of space vehicles. © 2017, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved. [ DOI ]

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