IP Library › Granted Patent US 7,563,841
Granted Patent B2
US 7,563,841 · App. 11/677,613 · Granted Jul 21, 2009

Cement for carbon articles

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Quick Facts
Patent No.
US 7,563,841
App. No.
11/677,613
Filed
Feb 22, 2007
Granted
Jul 21, 2009
Kind
B2
Art Unit
1796
USPC
524/496
Abstract

A cement useful for bonding carbon articles or sealing the surfaces of carbon articles to provide a surface useful for, inter alia, composite tooling or other high temperature applications or for bonding of carbon articles together to form larger blocks.

Claims (21)

1. A cement material for carbon articles comprising an admixture of filler, resin, water and not including either furfuryl alcohol or furfuraldehyde, wherein the filler comprises a first fraction and a second fraction and further wherein the second fraction has a particle size distribution wherein at least 80% of the particles are between about 0.2 microns and about 10 microns.

2. The cement of claim 1 wherein the filler is a carbonaceous material.

3. The cement of claim 1 wherein the filler comprises of from about 30% to about 90% by weight of the cement.

4. The cement of claim 1 wherein the first fraction has a particle size distribution wherein at least 80% of the particles are between about 2 microns and about 500 microns in diameter.

5. The cement of claim 1 wherein the first fraction comprises from about 20% to about 80% by weight of the cement.

6. The cement of claim 1 wherein the first fraction comprises particles of coke.

7. The cement of claim 1 wherein the first fraction comprises particles of graphite.

8. The cement of claim 1 wherein the second fraction comprises from about 10% to about 40% by weight of the cement.

9. The cement of claim 1 wherein the second fraction comprises particles of carbon black.

10. The cement of claim 1 wherein the resin comprises from about 10% to about 40% by weight of the cement.

11. The cement of claim 1 wherein the resin is soluble in water.

12. The cement of claim 1 wherein the resin is a phenolic resin.

13. The cement of claim 12 wherein the phenolic resin is a resole.

14. The cement of claim 12 wherein the phenolic resin is a novolac.

15. The cement of claim 1 wherein water is present at a level of up to about 15% by weight of the cement.

16. The cement of claim 1 further comprising resin solids.

17. A cement for carbon articles comprising by weight:

carbonaceous flour from about 20% to about 80%;

carbon black from about 10% to about 40%;

phenolic resin from about 10% to about 40% by weight; and

water which is present at a level of up to about 15% by weight.

Assignments (1)
RELEASE OF SECURITY INTEREST Recorded Feb 12, 2018
From: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
To: GRAFTECH INTERNATIONAL HOLDINGS INC.
Reel/Frame 045308/0567 →