International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

It is determined, that electron-beam processing of elements from optical glasses with nanosized coatings from metal oxides leads to improvement of their physical and mechanical properties, that influence operational characteristics of elements: negative microdefects on the surface are excluded, its microporosity decreases by 5… 10%, as well as microroughness from 30… 35 nm to 9… 15 nm; the microhardness of the surface increases from 2,3…3,5 GPa to 23,7…24,9 GPa, thus the influence of the coating thickness on its value decreases by 30…40%; wear resistance increases by 7… 12% and service life of optical elements increases by 20… 30%. Mathematical model has been developed, allowing to pre-define critical modes of electron-beam processing of elements, control of which allows to prevent their possible destructions and increase the probability of nonfailure work at operation.

The range of parameters of the electron beam (density of thermal effect Fn = 7∙106…8∙108 W/m² and travel speeds V = 5∙10-3…5∙10-2 m/s), within which there is an improvement in the performance characteristics of optical elements: increase of microhardness of the surface of elements from optical ceramics from 1,21∙103…2,83∙103MPa to 4,84∙103…7,15∙103 MPa and increase of the spectral transmission coefficient of IR-radiation by 4… 6% for elements of optical glass and for 5… 7% – for elements of optical ceramics; there occurs an increase in the critical values of the external heat flow leading to the destruction of the elements by 1,5…2 times, thus the increase of external pressure up to 107 Pa decreases the specified critical values by 1,3…1,5 times; critical values of thermoelastic stresses in optical elements at heating temperatures 300… 1200 K increase by 1,5…2,5 times, indicating an increase in resistance to thermal effects and increased external pressures of optical elements processed by an electronic beam; the values of critical heights of falling of a steel ball on their surface, leading to destruction of elements, increase from 0,18…1,1 m to 0,37…1,35 m, so, their resistance to mechanical shocks increases. It is established, that increase of durability of optical elements, processed by an electron beam, to external thermal and mechanical effects leads to the increase of probability of non-failure operation of optic-electronic devices under extreme conditions of operation to 10… 20%.