High density electric arc electrodes - moulded from graphite and phenol formaldehyde resin in concrete former

摘要

The electrodes of specified shape are cast in a low shrinkage concrete matrix contg. Portland cement which can withstand compression strength of is not 1500-2000 psi. by filling the matrix cavity with a mix of 92-85% flocculate graphite powder and quick hardening two step phenol formaldehyde resin, compressing to 105.5-140.6 kg/cm2 under heat, and firing at 960-2760 degrees C under inert atmos. to convert resin to carbon.