Refractory filaments

• US 6,395,080 B1
• Filed: 10/27/1998
• Issued: 05/28/2002
• Est. Priority Date: 08/28/1989
• Status: Expired due to Fees

• Current Assignee: Richard B. Cass, Roland R. Loh, Thomas C. Allen
• Original Assignee: Richard B. Cass, Roland R. Loh, Thomas C. Allen
• Inventors: Loh, Roland R., Cass, Richard B., Allen, Thomas C.
• Primary Examiner(s): Fiorilla, Christopher A.
• Application Number:
  US09/179,715
• Time in Patent Office: 1,309 Days
• Field of Search: 264/614,639,640 501/95.1 424/401,438 428/364 106/166.01
• US Class Current: 106/166.01
• CPC Class Codes: C04B 35/62227 obtaining fibres
• CPC Class Codes: H01M 4/66 Selection of materials
• CPC Class Codes: H01M 4/664 Ceramic materials
• CPC Class Codes: H01M 4/8605 Porous electrodes
• CPC Class Codes: H01M 4/8621 containing only metallic or ceramic material, e.g. made by sintering or sputtering
• CPC Class Codes: H01M 4/8803 Supports for the deposition of the catalytic active composition H01M4/90 takes precedence
• CPC Class Codes: H01M 4/90 Selection of catalytic material
• CPC Class Codes: H01M 8/0295 Matrices for immobilising electrolyte melts
• CPC Class Codes: H10N 60/0801 Manufacture or treatment of filaments or composite wires
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y10T 428/2913 Rod, strand, filament or fiber

Abstract

A filament produced from a wet-spinning process. The process comprising (a) preparing a dispersion of particles of refractory material; (b)preparing a spin mix by mixing said dispersion with a carrier solution comprising a salt of cellulose xanthate, wherein the weight ratio of said particles to cellulose of said cellulose xanthate in said spin mix is greater than about 1:4; (c) wet spinning said spin mix to form at least one filament of cellulose having at least a portion of said particles dispersed therein; and (d) optionally heating said at least one filament to sufficient temperatures and over sufficient durations to remove substantially all of said regenerated cellulose and to sinter said refractory particles to thereby form said at least one filament of refractory material is disclosed for producing fibers of refractory material.

Claims

1. A filament of fiber comprising regenerated cellulose containing particles of refractory material, wherein the weight ratio of said refractory material to said cellulose is greater than about 1:

4, wherein said refractory material comprises piezoelectric material.

2. The filament of claim 1, wherein said cellulose is stretched.

3. The filament of claim 2, Wherein said cellulose is stretched from about 32% to about 128%.

4. The filament of claim 1, wherein said ratio is greater than about 7:

3.

5. The filament of claim 4, wherein said ratio is greater than about 4:

1.

6. The filament of claim 1, wherein said filament has a diameter corresponding to the diameter of a stream of cellulose xanthate spun from a spinneret having an opening with a diameter of about 18 to about 400μ

and fed into a 53°

C. bath composed of 7.5% by weight of H₂SO₄, 22.0% by weight of Na₂SO₄, and the remainder deionized water.

7. The filament of claim 1, wherein said filament has a diameter of about 28 to about 45μ

.

8. A filament of regenerated cellulose containing ceramic particles, said filament being formed from a process comprising the steps of:

preparing a spin mix of a solution of cellulose and ceramic particles, wherein the weight ratio of ceramic particles to cellulose is about 4;

1, said ceramic particles comprising piezoelectric material;

wet spinning said spin mix through a spinneret to form a stream; and

extracting the solvent of the solution of cellulose from said stream to form said filament of regenerated cellulose containing said ceramic particles.

9. The filament of claim 8, wherein extracting said solvent reduces the diameter of said stream.

10. The filament of claim 8, wherein said solution of cellulose is viscose.

11. The filament of claim 8, wherein said filament is prepared using a lyocell process.

12. The filament of claim 8, wherein said filament has one or more defined properties selected from current carrying capacity, range of physical or mechanical properties, electrochemical properties, electrorestrictive properties or other property which is substantially the same as the corresponding property of said ceramic particles from which said filament is formed.

13. The filament of claim 8, wherein extracting said solvent comprises dehydration.