| 摘要 |
Carbon articles are produced by mixing finely divided carbon of very small particle size with a solution of a synthetic resinous binder, drying the mixture without completely hardening the binder, pulverizing the mixture to a powder of very small particle size, lightly consolidating in a mould a charge of the mixture powder, curing the binder to bond the particles together, carbonizing the bond to form a porous carbon article and pyrolitically depositing carbon throughout the pores from a carbon compound gas or vapour whilst heating the article to a temperature in the range 500 DEG to 1500 DEG C. The resin preferably forms not more than 15% by weight of the mixture. The carbon may be of uniform particle size throughout, preferably not greater than 150 mesh B.S.S. The carbon-compound gas or vapour is supplied as a moving stream sweeping over the articles at a pressure in the range sub-atmospheric to slightly above atmospheric. The consolidating pressure is preferably not greater than 10 p.s.i., and in some cases vibration is sufficient. The final article produced has a density greater than 1.7 g./c.c., a bend strength greater than 7800 p.s.i. and a compression strength greater than 35,000 p.s.i. |
