The electrical breakdown performance of the Cu-25 Cr alloy

which is taken Cu-Cr alloy as cathode

the pure W bar with 3.2mm in diameter as anode formed in vacuum chamber

was investigated by measuring and calculating the dielectric strength of the Cu-25 Cr alloy and relationship between distance and voltage

resistance.Meanwhile

effects of different content（0.06%

0.2%）rare earth element on electrical breakdown performance of the alloy were analyzed.By analyzing the dielectric strength of the samples

the relation between distance and voltage

electric resistance

the microstructure of the samples before and after the experiment

the factors affecting Cu-Cr alloy’s electrical breakdown performance were described.The results reveal that voltage strength resistance and anti-electric arc corrosion of the Cu-Cr alloy are imcreased to improve the electric breakdown performance as a result of RE refining structure.The electric breakdown performance of the Cu-Cr alloy is related with electric resistance and distance.At a given distance

with increasing in electric resistance

voltage strength resistance of the alloy is increased

which can decrease arc distance of electric contactor

meeting the electric performance requirements.