FORFARANDE FOR FRAMSTELLNING AV ALSTER AV BOROSILIKATGLAS,申请号SE19770010489-传众专利搜索

FORFARANDE FOR FRAMSTELLNING AV ALSTER AV BOROSILIKATGLAS

申请公布号：SE7710489(A)

申请号：SE19770010489

申请日期：1977.09.19

申请公布日期：1978.03.21

申请人：

PEDRO BUARQUE * MACEDO;THEODORE AARON * LITOVITZ

发明人：P B * MACEDO;P K * GUPTA;M G * DREXHAGE

分类号：C03C3/089;C03C3/091;C03C23/00;(IPC1-7):C03C23/00

主分类号：C03C3/089

摘要：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. The method substantially reduces the breaking tendency. A glass material and preshaped glass articles are also disclosed.