Voskresensk Experimental and Technological Center on Special Materials, Belozersky settlement, Moscow Region, Russia:

V. S. Kaskov, Deputy Chief on Science

There is described a technology for production of thin vacuum-tight beryllium foils (10–150 mm) with a protective coating. The following features were stated:
1) the lower content of BeO in metal, the higher possibility of production of thin vacuum-tight foils with beryllium content is more than 99%;
2) oxide barrier prevents interaction of beryllium and stainless steel jacket allowing an easy detaching of beryllium foil upon rolling at 600–700 ^oC;
3) passivated foil is active during the hole rolling cycle providing a standard level of maximum permissible concentration; the foil becomes thin down to 1 μm;
4) rolling of packages is made on modified “Kirchner” mill;
5) purity of the foil production bay is one of the key conditions of successful production process.
The foils, which are manufactured under conditions of commercial production are more cost effective than their import analogues. Industrial application of thin foils (10–20 μm) is possible only in case of their protection against corrosion attacks and the usage of windows of a special structure in items. All-Russian Institute of Aviation Materials (VIAM) started production of trial lots of vacuum-tight beryllium windows with protection coating (10–150 μm), which meets the requirements of world standards.

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