Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1996-09-20
1998-06-30
Czaja, Donald E.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65114, 65116, 65118, 65119, 65348, C03B 2700, C03B 2500, C03B 2100, C03B 2300
Patent
active
057727171
ABSTRACT:
A method of tempering an article is disclosed in which an article is heated so that the material making up the article is in an essentially stress-free state and the article thereafter is quenched and cooled. At the conclusion of the quenching, a stress pattern in initiated through the thickness of the article in which the midplane layer is in tension and the surface layers are in compression. This stress pattern is further developed during the cooling stage. The article is quenched by spraying the surfaces with a coolant, preferably comprising either liquid nitrogen or liquid air in the form of a two phase flow of liquid and vapor. The liquid is sprayed so that the surface tensile stress of the surface layers are not exceeded and the liquid does not accumulate on the surface layers as a film.
REFERENCES:
patent: 2026165 (1935-12-01), Goodwillie
patent: 2259727 (1941-10-01), Bowers
patent: 3701266 (1972-10-01), Chhisholm
patent: 3762902 (1973-10-01), Wagner et al.
patent: 3775087 (1973-11-01), Ritter, Jr.
patent: 3869876 (1975-03-01), Gardent et al.
patent: 4018590 (1977-04-01), Imler
Introduction to Ceramics by Kingery et al., pp. 830-831, 1976.
Kirschner Mark J.
Kozlu Hamdi
Sahm Michael K.
Czaja Donald E.
Pace Salvatore P.
Rosenblum David M.
Ruller Jacqueline A.
The BOC Group Inc.
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