Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1979-01-31
1981-01-13
Schor, Kenneth M.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 60R, 65111, 156663, 427309, C03C 1500
Patent
active
042447216
ABSTRACT:
A method for producing a glass article which comprises melting and forming a preshaped glass article having a composition in the phase separable regions of the alkali-boro-silicate or alkali-boro-germania-silicate systems, inducing the article to phase separate, leaching out a silica-poor phase from the surface layers only to form a structure having porous surface layers surrounding a solid region of substantially the original glass composition, washing this structure with an organic media which dissolves oxides of boron and other leaching reaction products, drying and heating to collapse the outer porous structure to form a glass having a silica-rich surface layer surrounding a solid region having substantially the original glass composition.
REFERENCES:
patent: 2106744 (1938-02-01), Hood et al.
patent: 2315329 (1943-03-01), Hood et al.
patent: 3782915 (1974-01-01), Filbert et al.
patent: 3785793 (1974-01-01), Park
patent: 3923688 (1975-12-01), Hammel et al.
patent: 4035210 (1977-07-01), Ohyoshi et al.
de Macedo Pedro B.
Drexhage Martin G.
Gupta Prabhat K.
De Macedo Pedro Buarque
Litovitz Theodore A.
Schor Kenneth M.
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