Abstract The instant invention relates to the production of articles exhibiting the physical properties and internal microstructure of glass-ceramic materials but which can be formed spontaneously from a molten glass, i.e., no heat treatment of a glass body is required to cause the crystallization in situ thereof, as is demanded in the manufacture of conventional glass-ceramic articles. More particularly, this invention is concerned with the production of glass-ceramic articles having compositions within the Li 2 O-Al 2 O 3 -SiO 2 -F field which are nucleated with TiO 2 , wherein beta-spodumene solid solution constitutes the predominant crystal phase, and which can be formed spontaneously from a molten glass batch.
Inventors
👤 David G. Grossman
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 16:27
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0018; C03C10/0027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
A method for making a highly crystalline glass-ceramic article consisting essentially of beta-spodumene solid solution and rutile crystals dispersed within a glassy matrix, said crystals constituting at least 50% by volume of said article, which comprises the steps of: a. melting a batch for a glass consisting essentially, by weight on the oxide basis as calculated from the batch, of about 4-7% Li 2 O, 12-19% Al 2 O.sub. 3, 60-70% SiO.sub. 2, 0.5-5% F, and 5-12% TiO 0 2 , the molar ratio Al.sub. 2 O.sub. 3 :Li 2 O being less than one; b. simultaneously cooling said melt at a rate between about 10°- 1000° C./minute to a temperature about 750°-900° C. to shape said melt into a glass body and obtain a phase separation and nucleation therein;
Claim 2
Independent Claim
130 words
A method for making a highly crystalline glass-ceramic article consisting essentially of beta-spodumene solid solution and rutile crystals dispersed within a glassy matrix, said crystals constituting at least 50% by volume of said article, which comprises the steps of: a. melting a batch for a glass consisting essentially, by weight on the oxide basis as calculated from the batch, of about 4-7% Li 2 O, 12-19% Al 2 O.sub. 3, 60-70% SiO.sub. 2, 0.5-5% F, and 5-12% TiO 0 2 , the molar ratio Al.sub. 2 O.sub. 3 :Li 2 O being less than one; b. simultaneously cooling said melt at a rate between about 10°- 1000° C./minute to a temperature about 750°-900° C. to shape said melt into a glass body and obtain a phase separation and nucleation therein;
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein said time sufficient to cause crystallization is at least about two minutes.
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein said crystallized body is cooled to room temperature by means of a quick chilling technique to thermally temper said body.