An increase in glass strength can be achieved by modifying the surface layer. Considered: gradient glasses, in which the strength of the glass increases due to the difference in TCLE over the thickness of the glass; ion bombardment, in which large atoms are embedded (implanted) into glass in a strong electromagnetic field; protective coatings (temporary and permanent); chemical hardening. The considered methods provide an increase in the strength of glass by increasing the strength of its surface, without changing the bulk strength
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