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US3948669A Expired / Lapsed US ⏱️ 0.0 years remaining

Glasses and glass-ceramics containing rutile fibers

Assignee: Corning Glass Works
•
Filing: 1975-03-28
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Granted: 1976-04-06
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Expires: 1995-03-28
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Abstract

Abstract This invention is concerned with the production of composite articles comprising a glass or glass-ceramic matrix containing long fibrous single crystals of rutile (TiO 2 ) of very high aspect ratios grown in situ. The glass articles are formed via the heat treatment of a molten batch consisting essentially, by weight on the oxide basis, of about 45-65% B 2 O 3 , 5-30% Al 2 O 3 , 5-30% TiO 2 , and 3-30% alkaline earth metal oxides and can exhibit greatly improved mechanical strength and toughness when compared with the original, or fiber-free, glass. The glass-ceramic articles are formed by heat treating the fiber-containing glass in a particular manner to cause the development of fine-grained crystals in situ, resulting in a highly-crystalline article containing long fibrous single crystals of rutile exhibiting verh high aspect ratios.

Inventors

  • 👤 William T. Brydges, III
  • 👤 Dennis W. Smith

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 17:53
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/002; C03C10/00; C03C10/0054; C03C2214/00; C03C2214/02

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 96 words
A composite article consisting essentially of long single crystal rutile fibers of high aspect ratios contained within a glass-ceramic matrix, said article having an overall eomposition consisting essentially, by weight on the oxide basis, of about 45-65% B 2 O 3 , 5-30% Al 2 O 3 , 5-30% TiO 2 , and 3-30% RO, wherein RO consists of an alkaline earth metal oxide selected from the group MgO, CaO, SrO, and BaO, and wherein the crystal phase of said glass-ceramic matrix consists essentially of fine grained rutile and Al 4 B 2 O 9 .
Claim 2
Dependent Claim 96 words
A composite article consisting essentially of long single crystal rutile fibers of high aspect ratios contained within a glass-ceramic matrix, said article having an overall eomposition consisting essentially, by weight on the oxide basis, of about 45-65% B 2 O 3 , 5-30% Al 2 O 3 , 5-30% TiO 2 , and 3-30% RO, wherein RO consists of an alkaline earth metal oxide selected from the group MgO, CaO, SrO, and BaO, and wherein the crystal phase of said glass-ceramic matrix consists essentially of fine grained rutile and Al 4 B 2 O 9 .
Claim 3
Dependent Claim 30 words
A composite article according to claim 1 wherein said fibers range up to about 0.5 inches in length and 0.004 inches in width, with aspect ratios up to about 200:1.
Claim 4
Dependent Claim 28 words
A composite article according to claim 2 wherein said fibers range between about 0.1-0.4 inches in length and 0.00l-0.004 inches in width, with aspect ratios between about 50-100:1.
Claim 5
Dependent Claim 33 words
A composite article according to claim 1 wherein said composition is essentially free from SiO 2 , P 2 O 5 , Li 2 O, Na 2 O, K 2 O, and F.
Claim 6
Dependent Claim 33 words
A composite article according to claim 1 wherein said composition consists essentially of about 50-65% B 2 O 3 , 15-25% Al 2 O 3 , 5-20% TiO 2 , and 3-15% RO.
Claim 7
Dependent Claim 13 words
A composite article according to claim 1 wherein fine-grained anatase is also present.

References Cited (Backward Citations)

US2920971A Cited
US2876074A Cited
US3899340A Cited
US3901719A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-04-06 1979-10-06 1980-04-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-04-06 1983-10-06 1984-04-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-04-06 1987-10-06 1988-04-06 $7700.00 Window Closed / Lapsed

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