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US4464475A Expired / Lapsed US ⏱️ 0.0 years remaining

Glass-ceramic articles containing osumilite

Assignee: Corning Glass Works
•
Filing: 1983-01-13
•
Granted: 1984-08-07
•
Expires: 2003-01-13
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Abstract

Abstract This invention is directed to the production of glass-ceramic bodies exhibiting high strength and capable of being used at temperatures of 1300° C. and higher. Barium osumilite constitutes the predominant crystal phase and the inventive bodies have overall compositions consisting essentially, in weight percent, of: ______________________________________ SiO 2 51-68 Al 2 O 3 17.5-30 MgO 5-12 BaO 3.5-15 Si 0-1 Nb 2 O 5 0-20 Ta 2 O 5 0-10 TiO 2 0-12 ZrO 2 0-6 ______________________________________ The bodies can be utilized in monolith form and are very useful as matrices for fiber reinforced structures suitable for high temperature applications.

Inventors

  • 👤 George H. Beall
  • 👤 Agustin M. Chirino
  • 👤 Kenneth Chyung
  • 👤 Francis W. Martin
  • 👤 Mark P. Taylor

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 20:27
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C14/00; C03C14/002; C03C2214/00; C03C2214/02; C03C2214/20; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/25; Y10T428/252

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 59 words
A glass-ceramic body exhibiting high strength and a use temperature up to 1300° C. and higher, wherein Ba-osumulite constitutes the predominant crystal phase, consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ SiO.sub.2 51-68 Al.sub.2 O.sub.3 17.5-30 MgO 5-12 BaO 3.5-15 Si 0-1 Nb.sub.2 O.sub.5 0-20 Ta.sub.2 O.sub.5 0-10 TiO.sub.2 0-12 ZrO.sub.2 0-6 ______________________________________
Claim 2
Dependent Claim 59 words
A glass-ceramic body exhibiting high strength and a use temperature up to 1300° C. and higher, wherein Ba-osumulite constitutes the predominant crystal phase, consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ SiO.sub.2 51-68 Al.sub.2 O.sub.3 17.5-30 MgO 5-12 BaO 3.5-15 Si 0-1 Nb.sub.2 O.sub.5 0-20 Ta.sub.2 O.sub.5 0-10 TiO.sub.2 0-12 ZrO.sub.2 0-6 ______________________________________
Claim 3
Dependent Claim 35 words
A glass-ceramic body according to claim 1 also containing up to 15% total of the following materials in the indicated proportions of 0-3% As 2 O 3 , 0-4% CaO, 0-12% SrO, and 0-10% ZnO.
Claim 4
Dependent Claim 52 words
A glass-ceramic body according to claim 1 which is crystallized in situ through internal nucleation and crystallization of a precursor glass body containing at least one nucleant selected from the group in at least the indicated minimum proportion of 0.1% Si, 10% Nb 2 O 5 , and 5% TiO 2 .
Claim 5
Dependent Claim 24 words
A glass-ceramic according to claim 2 prepared by firing a finely-divided, precursor glass frit wherein the mole ratio Al 2 O 3 : (MgO+CaO+ZnO+BaO+SrO)<1.
Claim 6
Dependent Claim 33 words
A glass-ceramic body according to claim 2 prepared by firing a finely-divided, precursor glass frit containing more than 1% CaO and wherein the mole ratio Al 2 O 3 :(MgO+BaO+SrO) may be ≧1.

References Cited (Backward Citations)

US2920971A Cited
US3480452A Cited
US3573939A Cited
US3713854A Cited
GB1459178A Cited
US3839053A Cited
GB1535202A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-08-07 1988-02-06 1988-08-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-08-07 1992-02-06 1992-08-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-08-07 1996-02-06 1996-08-07 $7700.00 Window Closed / Lapsed

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