PILOT RESERARCH FOR PRODUCTION OF
ELECTRICAL CONTACTS FOR STRONG CURRENTS
BY POWDER METALLURGY
There were experienced three pilot versions for electrical contacts for strong currents, W – Cu, by powder metallurgy. Based on these it was selected the following variant: Cu matrix composite reinforced with W, starting from the powder: W – 50.18 mass %, Ni – 1.02 %, Cu 48.06 %, and 0.74 % zinc stearate. 8 GPa pressed, sintered at 875 °C for 15 minutes, then infiltrated with Cu to fill the pores, resulting in a product that has a density of 11.738 kg/m3, similar to the theoretical density. It is noted that often remain additions of no infiltrated Cu and sometimes may appear craters in place of infiltration. It is preferred the version with as little as possible infiltrated Cu.
Keywords: sintered electrical contacts, W-Cu
Cuvinte cheie: contacte electrice sinterizate, W-Cu
