Patent ID: 7276284

Claim:
A carbon fiber-reinforced coke, comprising: a mixture of: a proportion of cut carbon fibers being surface-oxidized or non-surface-oxidized or stabilized precursor fibers for forming PAN-based carbon fibers, and at least one of the following being true for said cut carbon fibers or stabilized precursor fibers upon entering the delayed coker, said fibers or precursor fibers: not being provided with a sizing; or being provided with a sizing selected from the group consisting of sizings for satisfying objectives of various textile processes; or being provided with a sizing selected from the groups consisting of: waxes, montan waxes, and waxes produced synthetically by esterification of fatty alcohols with long-chain fatty acids containing 12 to 40 carbon atoms; polyurethane, phenolic, polyester, and epoxy resins; and low-viscosity pitches and pitches dissolved in organic solvents; feedstock for a delayed coking process, said feedstock including a material selected from the group consisting of highly aromatic residues of vacuum distillation, residues of visbreaking, residues of a fluidized catalytic cracking process, residues of thermocracking, residues of ethylene pyrolysis, soft pitches produced from coal coking or by distillation of highly aromatic coal residues; the mixture having been coked in a delayed coker; said feedstock, upon entering the delayed coker, containing at most 4% by weight of said cut carbon fibers or at most 8% by weight of said stabilized precursor fibers; and the coke having a coefficient of thermal expansion with values of at most 0.15×10 −6 K −1 , measured on specimens produced in accordance with DIN 51930 in an extrusion direction and in accordance with DIN 51909.