Back to results
US 4,359,438 AGranted
Process for molding corrosion resistant fuel cell collecting plates
AssigneeAshland Oil, Inc.
InventorsJames T. Hoggins, Golden F. Watts
Life of this patent
Estimating the term…
Abstract
Durable bipolar fuel cell collecting plates are molded from resin bonded graphite and furfural wetting agent.
Claims7
A process for making bipolar fuel cell collecting plates comprising the steps of:
- (a) blending 25 parts of a phenol formaldehyde resin having a mole ratio of 1.0 mole phenol to 0.60 to 0.90 mole formaldehyde, a curing amount to reduce weight loss on exposure to high temperature acidic conditions, of hexamethylene tetramine, 75 parts of graphite filler and an effective amount of furfural wetting agent in 100 grams of resin graphite blend;
- (b) charging the blend into a heated mold;
- (c) heating the charged mold under pressure;
- (d) releasing the pressure allowing the escape of gaseous products;
- (e) further heating the charged mold under pressure;
- (f) cooling the mold;
- (g) removing the formed plate;
- and
- (h) postcuring the formed plate.
6 more elements
A process for making bipolar fuel cell collecting plates comprising the steps of:
- (a) blending 25 parts of a styrenated phenol formaldehyde resin having a mole ratio of 4 moles phenol to 0.1 to 4.0 moles styrene to 3.2 moles formaldehyde, a curing amount of hexamethylene tetramine, 75 parts of graphite filler and an effective amount, to reduce weight loss on exposure to high temperature acidic conditions of furfural wetting agent in 100 grams of resin graphite blend;
- (b) charging the blend into a heated mold;
- (c) heating the charged mold under pressure;
- (d) releasing the pressure allowing the escape of gaseous products;
- (e) further heating the charged mold under pressure;
- (f) cooling the mold;
- (g) removing the formed plate;
- and
- (h) postcuring the formed plate.
6 more elements
Dependencies are inferred from the claim text.