Patent US3793041A successfully refreshed from Google Patents.
US3793041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory fibers of zirconia and silica mixtures
Assignee: 3M Co
•
Filing: 1971-08-02
•
Granted: 1974-02-19
•
Expires: 1991-08-02
Abstract
Abstract Refractory fibers of zirconia and silica mixtures are made by shaping and dehydratively gelling, for example by extruding in air, an aqueous mixture of a zirconium compound, such as zirconium diacetate, and colloidal silica, and heating the resulting gelled fiber in a controlled manner to decompose and volatilize undesired constituents and convert the fiber to a refractory fiber having a desired microstructure and useful to form refractory fabrics, reinforced composites, heat or sound insulation, filter or adsorption media, etc.
Inventors
- 👤 H Sowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6225; C04B35/01; C04B35/48; C04B35/6224
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
17 words
Refractory fiber according to claim 1, wherein the mole ratio of zirconia to silica is about 1:1.
Claim 2
Dependent Claim
17 words
Refractory fiber according to claim 1, having a density of 1.5 to 4.3 grams per cubic centimeter.
Claim 3
Dependent Claim
18 words
Refractory fiber according to claim 1 having a modulus of elasticity of less than 25 X 106 psi.
Claim 4
Dependent Claim
18 words
Refractory fiber according to claim 1 having a modulus of elasticity of 7 to 20 X 106 psi.
Claim 5
Dependent Claim
11 words
Refractory fiber according to claim 1, further comprising a metal oxide.
Claim 6
Dependent Claim
27 words
Refractory fiber according to claim 1, further comprising 0.5 to 25 weight percent of a metal oxide, based on the total weight of said zirconia and silica.
Claim 7
Dependent Claim
20 words
Refractory fiber according to claim 1, further comprising an amount of a metal oxide sufficient to impart a color thereto.
Claim 8
Dependent Claim
14 words
Refractory fiber according to claim 1 further characterized as being round, straight, and continuous.
Claim 9
Dependent Claim
6 words
Textile comprising fiber of claim 1.
Claim 10
Dependent Claim
7 words
Woven fabric comprising fiber of claim 1.
Claim 11
Dependent Claim
27 words
Woven fabric comprising fiber of claim 1 and capable of having its color or tone changed by the application of heat in an oxidizing or reducing atmosphere.
Claim 12
Dependent Claim
7 words
Non-woven textile comprising fiber of claim 1.
Claim 13
Dependent Claim
7 words
A mat comprising fiber of claim 1.
Claim 14
Dependent Claim
50 words
An essentially zircon-free, solid, transparent refractory fiber round in cross-sections, comprising a mixture of microcrystalline zirconia and amorphous silica, said zirconia being essentially the sole zirconium compound in said refractory and predominantly present in its tetragonal form, the mole ratio of zirconia to silica in said refractory being about 1:1.
Claim 15
Dependent Claim
11 words
A product comprising a plurality of the fibers of claim 15.
Claim 16
Independent Claim
123 words
A method comprising extruding in air in the form of fiber a liquid composition comprising an aqueOus mixture of colloidal silica and zirconium compound capable of being calcined to zirconia, the mole ratio of equivalent zirconia to silica in said liquid composition being in the range of 1.5:1 to 1:2, said liquid having an equivalent solids content of 15 to 55 weight percent, heating the resulting gelled fiber to remove water, organic material, and carbon therefrom and form refractory fiber, and heating the latter at an elevated temperature in the range of 900* to 1,150*C. for a sufficient period of time to form solid, transparent, essentially zircon-free refractory fiber comprising a mixture of microcrystalline zirconia in predominantly its tetragonal form and amorphous silica.
Claim 17
Dependent Claim
18 words
The method according to claim 17, wherein said elevated temperature is in the range of 950* to 1,050*C.
Claim 18
Dependent Claim
25 words
The method according to claim 17, wherein the mole ratio of zirconia to silica in said liquid composition and in said refractory fiber is 1:1.
Claim 19
Dependent Claim
18 words
The method according to claim 17, wherein said liquid composition has a viscosity of 45,000 to 500,000 cps.
Claim 20
Independent Claim
104 words
A method for forming fibers made of a transparent, solid, essentially zircon-free refractory comprising a mixture of microcrystalline zirconia in predominantly its tetragonal form and amorphous silica, the mole ratio of zirconia to silica in said refractory being about 1:1, which method comprises extruding through orifices a viscous liquid comprising a dispersion of colloidal silica in an aqueous solution of zirconium diacetate, drawing the resulting fibers in air, heating the drawn fibers in air to remove water, organic material, and carbon therefrom and form refractory, and further heating the latter at 900* to 1, 150*C. for a sufficient time to form said refractory fibers.
References Cited (Backward Citations)
US3082099A
Cited
US3311481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |