Claims
- 1. A method for making a preform, comprising:forming a slurry including materials having a plurality of structural forms, one of which is carbon fibers and another of which is a powder selected from the group consisting of pitch, coke, and silicon carbide; dispersing a cationic material into the slurry so as to substantially coat the plurality of structural forms with the cationic material; dispersing an anionic material into the slurry having the coated structural forms therein so as to cause the coated structural forms to flocculate; and drying the flocced slurry in a shaped form to obtain a preform.
- 2. The method of claim 1, wherein the structural forms comprise particles, flakes, and fibers.
- 3. The method of claim 1, wherein the form is shaped to provide a preform block.
- 4. The method of claim 1, wherein the form is shaped to provide a cylindrical preform having a thickness of 2.75 inches or 3.125 inches.
- 5. The method of claim 1, wherein dispersing the cationic material comprises dispersing a cationic polymer.
- 6. The method of claim 1, wherein dispersing the anionic material comprises dispersing an anionic polymer.
- 7. The method of claim 1, wherein drying the flocced slurry includes dewatering the flocced slurry.
- 8. A method for making a preform, comprising:forming a slurry including materials having a plurality of structural forms, one of which is carbon fibers and another of which is a powder selected from the group consisting of pitch, coke, and silicon carbide; dispersing an anionic material into the slurry so as to substantially coat the plurality of structural forms with the anionic material; dispersing a cationic material into the slurry having the coated structural forms therein so as to cause the coated structural forms to flocculate; and drying the flocced slurry in a shaped form to obtain a preform.
- 9. The method of claim 8, wherein the structural forms comprise particles, flakes, and fibers.
- 10. The method of claim 8, wherein the form is shaped to provide a preform block.
- 11. The method of claim 8, wherein the form is shaped to provide a cylindrical preform having a thickness of 2.75 inches or 3.125 inches.
- 12. The method of claim 8, wherein dispersing the anionic material comprises dispersing an anionic polymer.
- 13. The method of claim 8, wherein dispersing the cationic material comprises dispersing a cationic polymer.
- 14. The method of claim 8, wherein drying the flocced slurry includes dewatering the flocced slurry.
- 15. A method for making a preform for use in the manufacture of a friction brake, comprising:forming a slurry including materials having a plurality of structural forms, one of which is carbon fibers and another of which is a powder selected from the group consisting of pitch, coke, and silicon carbide; dispersing a cationic material into the slurry so as to substantially coat the plurality of structural forms with the cationic material; dispersing an anionic material into the slurry having the coated structural forms therein so as to cause the coated structural forms to flocculate; and drying the flocced slurry in a form having the shape of a block or a right cylinder to obtain a preform.
- 16. A method for making a preform for use in the manufacture of a friction brake, comprising:forming a slurry including materials having a plurality of structural forms, one of which is carbon fibers and another of which is a powder selected from the group consisting of pitch, coke, and silicon carbide; dispersing an anionic material into the slurry so as to substantially coat the plurality of structural forms with the anionic material; dispersing a cationic material into the slurry having the coated structural forms therein so as to cause the coated structural forms to flocculate; and drying the flocced slurry in a form having the shape of a block or a right cylinder to obtain a preform.
RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 09/611,735 filed on Jul. 7, 2000, now abandoned the entire contents of which are hereby incorporated by reference.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0 421 418 |
Apr 1991 |
EP |
Non-Patent Literature Citations (2)
Entry |
Kirk-Othmer, “Flocculating Agents”, Encyclopedia of Chemical Technology, vol. 11, pp. 61-80 (1994). |
Patent Abstracts of Japan, vol. 013, No. 179 (C-590), Apr. 26 1989 & JP 01 008232A (Tokai Carbon Co. Ltd.) Jan. 12 1989. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/611735 |
Jul 2000 |
US |
Child |
09/853230 |
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US |