Method of manufacturing a tempered glass dielectric material for

Details Method of manufacturing a tempered glass dielectric material for Method of manufacturing a tempered glass dielectric material for

1982-10-27

1984-09-11

Schor, Kenneth M.

Stock material or miscellaneous articles

Surface property or characteristic of web, sheet or block

Surface modified glass

65 3014, 174137B, C03B 2700, C03C 2100

Patent

active

044710240

ABSTRACT:
A tempered glass dielectric material for use as an electrical insulator is thermally tempered to produce surface compression between 200 MPa and 400 MPa. At least part of the material is then chemically tempered under conditions of temperature and duration such that the surface compression due to the thermal tempering is reduced by between 50% and 80%. The chemical tempering is effected by applying to the relevant part of the material, at ambient temperature, a solution containing alkaline salts. This solution is dried and the material then heated for several hours at a temperature between 300.degree. C. and 500.degree. C. The solution has the following composition (in percentage by weight):

REFERENCES:
patent: 2198734 (1940-04-01), Littleton
patent: 3287200 (1966-11-01), Hess et al.
patent: 3445316 (1969-05-01), Megles
patent: 3498773 (1970-03-01), Grubb et al.
patent: 3607172 (1971-09-01), Poole et al.
patent: 3751238 (1973-08-01), Grego et al.

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