초록 ▼

Disclosed herein are shaped articles of porous carbon comprising carbon fibers having a compression strength of higher than 50 kg/cm2 and a porosity of 50 to 80%, in which radii of not less than 60% of the pores are distributed in a range wherein the difference between the upper pore radius and the

Disclosed herein are shaped articles of porous carbon comprising carbon fibers having a compression strength of higher than 50 kg/cm2 and a porosity of 50 to 80%, in which radii of not less than 60% of the pores are distributed in a range wherein the difference between the upper pore radius and the lower pore radius is 20 microns.

대표청구항 ▼

A shaped article comprised of porous carbon having a porosity of 50 to 85% and a compressive strength of more than 50 kg/cm2 wherein the radii of not less than 60% of the total number of the pores of said shaped article are distributed in a range wherein the differences between the upper limit of th

A shaped article comprised of porous carbon having a porosity of 50 to 85% and a compressive strength of more than 50 kg/cm2 wherein the radii of not less than 60% of the total number of the pores of said shaped article are distributed in a range wherein the differences between the upper limit of the pore radius and the lower limit of the pore radius is not more than 20 microns, said shaped articles being prepared by: (a) preparing lumps of a mixture of 100 parts by weight of carbonaceous fibers of 3 to 30 microns in diameter and less than 2 mm in length and 20 to 100 parts by weight of a resinous binder selected from the group consisting of phenolic resins and furfuryl alcohol resins; (b) crushing the thus prepared mixture; (c) adding to 100 parts by weight of the resultant crushed mixture 20 to 100 parts by weight of a granular substance which is soluble in a solvent, and wherein the radii of the particles occupying more than 70% of the weight of said granular substance are distributed in a range wherein the difference between the upper limit of the radius thereof and the lower limit of the radius thereof is not more than 30 microns; (d) shaping the thus obtained mixture at an elevated temperature and under pressure; (e) immersing the thus shaped mixture into a solvent which is capable of dissolving said granular substance, thereby removing said granular substance from the shaped mixture; and (f) baking the thus treated mixture at an elevated temperature, thereby obtaining said shaped articles of porous carbon.