Patent US3715196A successfully refreshed from Google Patents.
US3715196A
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Low-expansion glass-ceramic cementing method
Assignee: Corning Glass Works
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Filing: 1970-09-02
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Granted: 1973-02-06
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Expires: 1990-09-02
Abstract
Abstract A cementing composition and method suitable for bonding together glass-ceramic structures comprising preparing a mixture containing a thermally devitrifiable glass and a flux containing a quantity of silica fibers, applying said mixture to the glassceramic components to be bonded, and thereafter heat treating the cemented structure so that the cement is cured to a glass-ceramic bond which closely matches the glass-ceramic components in microstructure and thermal properties.
Inventors
- 👤 M Montierth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:09
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/04; C04B37/045; C03; C03C; C03C10/00; C03C10/16; C04B37/003; C04B37/005; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/5232; C04B2235/5264; C04B2235/5296; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2235/6567; C04B2235/70; C04B2235/74; C04B2235/76; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/062; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
9 words
60-80% silica fibers, 3-25% LiF, and 5-25% AlBO3; and
Claim 2
Dependent Claim
9 words
60-80% silica fibers, 3-25% LiF, and 5-25% AlBO3; and
Claim 3
Independent Claim
396 words
A method of bonding glass-ceramic components together to form a bonded glass-ceramic assembly having a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz, and fluorophlogopite, wherein the principal crystal phase of the bond area matches the principal crystal phase of the glass-ceramic assembly comprising the steps of: a. preparing a fluxing cementing composition consisting essentially, in weight percent, of 60-90 percent of a thermally devitrifiable glass and 10-40 percent of a fiber-flux mixture; i. said thermally devitrifiable glass being selected from the group of glasses which upon controlled devitrification will have a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz and fluorophlogopite, said principal crystal phase matching the principal crystal phase of the glass-ceramic assembly; and ii. said fiber-flux mixture consisting essentially of a fused silica fiber constituent, a metal fluoride salt constituent selected from the group consisting of LiF, ZnF2 and MgF2, and at least one other constituent selected from the group consisting of AlBo3, Al(OH)3, and H3BO3, the composition of said fiber-flux mixture being such that, upon heating, the constituents of said fiber-flux mixture will interact to form a glass which upon controlled devitrification will have a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz, and fluorophlogopite, said principal crystal phase matching the principal crystal phase of the glass-ceramic assembly, b. applying said fluxing cementing compositing to selected areas of at least one of said glass-ceramic components; c. placing said glass-ceramic components in contacting relationship with one another to form said glass-ceramic assembly; and d. subjecting said glass-ceramic assembly to heat treatment at a temperature at least sufficient to cause controlled devitrification of said thermally devitrifiable glass, interaction of said constituents of said fiber-flux mixture to form a glass, and controlled devitrification of said glass, but below a temperature at which said glass-ceramic assembly will deform, for a time at least sufficient to obtain substantially complete crystallization of said fluxing cementing composition, so as to convert said fluxing cementing composition from a glassy state to a glass-ceramic bond having a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz and fluorophlogopite which matches the principal crystal phase of said glass-ceramic assembly.
Claim 4
Independent Claim
396 words
A method of bonding glass-ceramic components together to form a bonded glass-ceramic assembly having a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz, and fluorophlogopite, wherein the principal crystal phase of the bond area matches the principal crystal phase of the glass-ceramic assembly comprising the steps of: a. preparing a fluxing cementing composition consisting essentially, in weight percent, of 60-90 percent of a thermally devitrifiable glass and 10-40 percent of a fiber-flux mixture; i. said thermally devitrifiable glass being selected from the group of glasses which upon controlled devitrification will have a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz and fluorophlogopite, said principal crystal phase matching the principal crystal phase of the glass-ceramic assembly; and ii. said fiber-flux mixture consisting essentially of a fused silica fiber constituent, a metal fluoride salt constituent selected from the group consisting of LiF, ZnF2 and MgF2, and at least one other constituent selected from the group consisting of AlBo3, Al(OH)3, and H3BO3, the composition of said fiber-flux mixture being such that, upon heating, the constituents of said fiber-flux mixture will interact to form a glass which upon controlled devitrification will have a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz, and fluorophlogopite, said principal crystal phase matching the principal crystal phase of the glass-ceramic assembly, b. applying said fluxing cementing compositing to selected areas of at least one of said glass-ceramic components; c. placing said glass-ceramic components in contacting relationship with one another to form said glass-ceramic assembly; and d. subjecting said glass-ceramic assembly to heat treatment at a temperature at least sufficient to cause controlled devitrification of said thermally devitrifiable glass, interaction of said constituents of said fiber-flux mixture to form a glass, and controlled devitrification of said glass, but below a temperature at which said glass-ceramic assembly will deform, for a time at least sufficient to obtain substantially complete crystallization of said fluxing cementing composition, so as to convert said fluxing cementing composition from a glassy state to a glass-ceramic bond having a principal crystal phase consisting essentially of a species selected from the group consisting of beta-spodumene, cordierite, zinc petalite, beta-quartz and fluorophlogopite which matches the principal crystal phase of said glass-ceramic assembly.
Claim 5
Dependent Claim
212 words
The method of claim 1 wherein said thermally devitrifiable glass is selected from the following four groups of glasses wherein the compositions thereof consist essentially, in weight percent on the oxide basis as calculated from the batch, of about: (Group A) 60-80% SiO2, 10-25% Al2O3, 2-10% Li2O, and 0-5% BaO; (Group B) 40-80% SiO2, 10-35% Al2O3, 5-20% MgO, and 0-15% TiO2; (Group C) 40-60% SiO2, 20-30% Al2O3, 20-30% ZnO, 0-15% ZrO, and 0-0.5% Ag, Au, Cu, and/or Pt; (Group D) 35-48% SiO2, 5-15% B2O3, 14-22% Al2O3, 15-25% MgO, 3-8% K2O, and 5-10% F. said thermally devitrifiable glass being selected as follows: from Group A when said glass-ceramic components to be bonded have a principal crystal phase consisting essentially of beta-spodumene; from Group B when said glass-ceramic components to be bonded have a principal crystal phase consisting essentially of cordierite; from Group C when said glass-ceramic components to be bonded have a principal crystal phase consisting essentially of beta-quartz or zinc petalite; and from Group D when said glass-ceramic components to be bonded have a principal crystal phase consisting essentially of fluorophlogopite; and wherein said fiber-flux mixture is selected as follows: from the two following compositions when utilized with the thermally devitrifiable glasses of Group A, said compositions being expressed in weight percent:
Claim 6
Dependent Claim
32 words
60-80% silica fibers, 3-25% LiF, 5-25% Al(OH)3 and 0-15% H3BO3; from the two following compositions when utilized with the thermally devitrifiable glasses of Group B, said compositions being Expressed in weight percent:
Claim 7
Dependent Claim
32 words
60-80% silica fibers, 3-25% LiF, 5-25% Al(OH)3 and 0-15% H3BO3; from the two following compositions when utilized with the thermally devitrifiable glasses of Group B, said compositions being Expressed in weight percent:
Claim 8
Dependent Claim
9 words
40-80% silica fibers, 3-25% MgF2, and 10-35% AlBO3; and
Claim 9
Dependent Claim
9 words
40-80% silica fibers, 3-25% MgF2, and 10-35% AlBO3; and
Claim 10
Dependent Claim
146 words
The method of claim 2 wherein said heat treatment comprises: a. heating at a temperature ranging from about 1,000*C. to about 1,100*C. for a time ranging from about 2-12 hours when said principal crystal phase of said glass-ceramic assembly consists essentially of beta-spodumene; b. heating at a temperature ranging from about 1,100*C. to about 1,200*C. for a time ranging from about 2-12 hours when said principal crystal phase of said glass-ceramic assembly consists essentially of cordierite; c. heating at a temperature ranging from about 700*C. to about 900*C. for a time ranging from about 2-12 hours when said principal crystal phase of said glass-ceramic assembly consists essentially of beta-quartz or zinc petalite; and d. heating at a temperature ranging from about 800*C. to about 1,000*C. for a time ranging from about 2-12 hours when said principal crystal phase of said glass-ceramic assembly consists essentially of fluorophlogopite.
Claim 11
Dependent Claim
29 words
The method of claim 2 wherein said thermally devitrifiable glass is in the form of a powder having a particle size ranging from about 1 to about 30 microns.
Claim 12
Dependent Claim
32 words
40-80% silica fibers, 3-25% MgF2, 10-35% Al(OH)3, and 0-23% H3BO3; from the two following compositions when utilized with the thermally devitrifiable glasses of Group C, said compositions being expressed in weight percent:
Claim 13
Dependent Claim
32 words
40-80% silica fibers, 3-25% MgF2, 10-35% Al(OH)3, and 0-23% H3BO3; from the two following compositions when utilized with the thermally devitrifiable glasses of Group C, said compositions being expressed in weight percent:
Claim 14
Dependent Claim
33 words
40-60% silica fibers, 3-25% ZnF2, 15-35% Al(OH)3, and 0-23% H3BO3; and from the two following compositions when utilized with the thermally devitrifiable glasses of Group D, said compositions being expressed in weight percent:
Claim 15
Dependent Claim
33 words
40-60% silica fibers, 3-25% ZnF2, 15-35% Al(OH)3, and 0-23% H3BO3; and from the two following compositions when utilized with the thermally devitrifiable glasses of Group D, said compositions being expressed in weight percent:
Claim 16
Dependent Claim
11 words
40-80% silica fibers, 3-25% MgF2, 5-15% K2O, and 10-50% AlBO3; and
Claim 17
Dependent Claim
11 words
40-80% silica fibers, 3-25% MgF2, 5-15% K2O, and 10-50% AlBO3; and
Claim 18
Dependent Claim
12 words
40-80% silica fibers, 3-25% MgF2, 5-15% K2O, 10-50% Al(OH)3 and 0-30% H3BO3.
Claim 19
Dependent Claim
12 words
40-80% silica fibers, 3-25% MgF2, 5-15% K2O, 10-50% Al(OH)3 and 0-30% H3BO3.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |