探討燒結參數對於抑制銀擴散的（Zn,Mg）TiO3-based積層陶瓷電容器之影響

Abstract

In this study, the effects of heating rate and two-steps sintering on the sintering behavior, the microstructure and the silver diffusion of (Zn, Mg) TiO3-based Mulitlayer Ceramic Capacitors (AMT MLCC) with pure silver electrodes were investigated. The EDS results showed that the silver ions diffused into the dielectric layer significantly when ZMT MLCC was sintered directly up to 900℃ with a fixed heating rate (conventional sintering). However, ZMT MLCC was pre-sintered at 600℃~800℃then sintered at 900℃ (two-steps sintering), it was found effectively suppressed silver ion diffusion into dielectric layer. For example, the concentration of silver ions was identified by energy dispersive spectrometer (EDS), and both of conventional sintering and two-steps intering are 2 at% and 0.1 at%, respectively. In addition, SEM observations showed that the silver electrode of ZMT MLCCs was greatly discontinuity by conventional sintering. Unlike two-steps sintering, this result shows that the silver electrode of ZMT MLCCs was completely continuity. To prove the effect of silver ions diffusion on the insulation resistance of ZMT MLCCs, the insulation resistance under different sintering conditions was measured at 85℃ and 95 R.H. atmosphere. The insulation resistance of ZMT MLCCs with conventional sintering was degraded obviously which was compared with two-steps sintering.