Stackpole Carbon Company

John W Borkowski

William A Nystrom

La Vern Lenze, Jr

Alan F Campbell

Vermiform graphite is compressed to produce a preform with a density of about 0.03 to 0.8 g/cc, followed by comminuting the preform to produce a graphite molding powder that will have a typical mold fill-ratio between about 7 and 10 to 1 for making molded graphite parts with a density of at least 1.1 g/cc.

Graphite molding powder and method of preparation

Finely-divided graphite flake is heated to a high temperature in the presence of boron or a boron-containing compound to cause the boron to permeate the crystal structure of the flake, which is then subjected to an intercalating agent and rapidly heated, resulting in an expanded or vermicular graphite with a bulk density substantially less than what might be expected if the flake were not pretreated with boron. The expanded graphite then is compressed to form a preform that is reduced in thickness by rolling or molding to form a higher-strength flexible graphite foil than heretofore.

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Ridgway, PA, United States of America

John W Borkowski