IP Library Granted Patent US 7,824,650
Granted Patent B2
US 7,824,650 · App. 11/677,328 · Granted Nov 2, 2010

Enhanced directional conductivity of graphitizable foam

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Quick Facts
Patent No.
US 7,824,650
App. No.
11/677,328
Granted
Nov 2, 2010
Kind
B2
Abstract

A graphitizable carbon foam having enhanced directional thermal conductivity is provided. The mesophase portions of a mesophase pitch are aligned with each other to create an oriented mesophase pitch, which is then foamed to provide an oriented pitch foam. The pitch foam can be heated to carbonize the pitch thereby forming an oriented carbon foam. The carbon foam can be further heated to provide an oriented graphite foam.

Claims (15)

1. A process for manufacturing a carbon foam with enhanced directional thermal conductivity, comprising:

(a) providing a mesophase pitch having mesophase portions, each mesophase portion comprising layer planes of aligned molecules;

(b) aligning the layer planes of the mesophase portions of the mesophase pitch with each other to create an oriented mesophase pitch by exposing the mesophase pitch to a magnetic field;

(c) foaming the oriented mesophase pitch thereby forming an oriented pitch foam with enhanced thermal conductivity in directions corresponding to the orientation of the layer planes of the mesophase portions of the mesophase pitch; and

(d) heating the oriented pitch foam to a temperature sufficient to carbonize the pitch, thereby forming an oriented carbon foam.

2. The process of claim 1 , further comprising:

graphitizing the oriented carbon foam of step (d).

3. The process of claim 1 , wherein:

step (b) further comprises providing relative rotation between a molten mesophase pitch and a magnetic field.

4. The process of claim 3 , wherein:

step (a) comprises forming the mesophase pitch while providing relative rotation between the mesophase pitch and the magnetic field, so that steps (a) and (b) occur at least partially simultaneously.

5. The process of claim 3 , wherein:

step (c) is conducted while providing relative rotation between the mesophase pitch and the magnetic field.

6. The process of claim 3 , wherein:

step (d) is conducted while providing relative rotation between the oriented pitch foam and the magnetic field.

Assignments (5)
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 →
SECURITY AGREEMENT Recorded Jun 10, 2015
From: GRAFTECH INTERNATIONAL HOLDINGS INC.; FIBER MATERIALS INC.
To: JPMORGAN CHASE BANK N.A., AS COLLATERAL AGENT
Reel/Frame 035839/0754 →
SECURITY AGREEMENT Recorded Jul 14, 2010
From: GRAFTECH INTERNATIONAL HOLDINGS INC.
To: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Reel/Frame 024678/0830 →
CHANGE OF NAME Recorded Oct 15, 2007
From: UCAR CARBON COMPANY INC.
To: GRAFTECH INTERNATIONAL HOLDINGS INC.
Reel/Frame 019961/0697 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 10, 2007
From: STANSBERRY, PETER G.; SINGER, LEONARD
To: UCAR CARBON COMPANY INC.
Reel/Frame 019554/0035 →