Preparation, electrical contact performance and arc-erosion behavior of Cu/La_2NiO_4 composites

摘要

La_2NiO_4 conductive particles were incorporated into Cu matrix for enhanced electrical contact performance, while their effect on the arc erosion behavior of contacts was investigated. The results indicate that the particles in the hot-pressed Cu/La_2NiO_4 composites accelerate the separation of oxide scales from contact surface during arc erosion cycling, suggested by increased mass loss of roughly 3 to 9 times larger than pure Cu. Thus, the growth of oxide scales on contact surface was blocked by a self-cleaning-like function. As a result, the contact resistance declines to 21.6 mΩ after 5000 cycles, in contrast with 29.5 mΩ for Cu, and correspondingly the temperature rise degrades about 30.7%.