Process for making graphite articles
First Claim
1. A process for preparing a graphite article, the process comprising(a) mixing (i) a particulate fraction comprising at least about 35 weight percent coke, coal or mixtures thereof having a diameter such that a major fraction passes through a 25 mm mesh screen but not a 0.25 mm mesh screen, (ii) a pitch binder and (iii) carbon fibers, to form a stock blend;
- (b) extruding the stock blend to form a green stock;
(c) baking the green stock to form a carbonized stock; and
(d) graphitizing the carbonized stock by maintaining the carbonized stock at a temperature of at least about 2500°
C.,wherein the fibers are added to the particulate fraction and pitch binder after at least about 15% of the mix cycle is completed.
5 Assignments
0 Petitions
Accused Products
Abstract
A process for preparing graphite articles is presented. In particular, the process includes employing a particulate fraction comprising at least about 35 weight percent coke, coal or combinations thereof having a diameter such that a major fraction of it passes through a 0.25 mm to 25 mm mesh screen. The particulate fraction is mixed with a liquid or solid pitch binder, to form a stock blend; the stock blend is extruded to form a green stock; the green stock is baked to form a carbonized stock; and the carbonized stock is graphitized. The stock blend further includes carbon fibers added after mixing of the particulate fraction and pitch has begun.
12 Citations
13 Claims
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1. A process for preparing a graphite article, the process comprising
(a) mixing (i) a particulate fraction comprising at least about 35 weight percent coke, coal or mixtures thereof having a diameter such that a major fraction passes through a 25 mm mesh screen but not a 0.25 mm mesh screen, (ii) a pitch binder and (iii) carbon fibers, to form a stock blend; -
(b) extruding the stock blend to form a green stock; (c) baking the green stock to form a carbonized stock; and (d) graphitizing the carbonized stock by maintaining the carbonized stock at a temperature of at least about 2500°
C.,wherein the fibers are added to the particulate fraction and pitch binder after at least about 15% of the mix cycle is completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification