Accession Number : ADD000053

Title :   Electro-Ionic Method of Strengthening Glass.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Larrick,Benjamin F

Report Date : 16 Oct 1973

Pagination or Media Count : 7

Abstract : The patent concerns a process for strengthening glass comprising (1) subjecting one face of sodium or lithium containing glass at a temperature above its annealing point to a current from a molten salt to affect replacement of sodium or lithium ions by larger ions, (2) repeating step (1) but using a molten sodium or lithium salt and allowing current to flow for a time greater than the time to be used in steps (3) and (5) combined; (3) subjecting the opposite face of the glass as in step (1) but with the current reversed, (4) chill-tempering the glass and (5) repeating step (3) but at a temperature which is below the strain point of the glass.

Descriptors :   *Glass, *Strength(Mechanics), *Patents, Electric current, Fused salts, Ion exchange, Diffusion, Sodium, Lithium, Potassium, Heat treatment

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE