Patent ID: 7658903

Claim:
A method of producing a graphite article comprising: a. mixing raw needle coke having a coefficient of thermal expansion less than 0.4 ppm/° C. measured between 30° C. and 100° C. and which has been milled such that 95% by weight passes through a screen having mesh size of about 100 microns with binder pitch to form a coke mixture; b. milling the coke mixture to create a molding powder such that 95% by weight passes through a screen having mesh size of about 150 microns; c. isostatically molding the molding powder to form a green article; and d. graphitizing the processed carbonaceous article to obtain a graphite article having an isotropy ratio of no greater than about 1.5, where isotropy ratio is defined as the ratio of coefficient of thermal expansion in two directions, with less than about 300 parts per million ash and less than about 2 parts per million boron equivalence without a post-graphite purification treatment.