A Study of the Microstructure and Electric Properties of Ba₂Ti₉O₂₀-based Multilayer Ceramic Capacitors by Microwave Sintering

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• 作者：Ying-Chieh Lee^a ; ^{YCLee@mail.npust.edu.tw} ; Yu Hong Chen^a ; Yung-Lin Huang^a ; Lay Gaik Teoh^b
• 关键词：Microwave sintering ; conventional sintering ; MLCC ; silver diffusion ; Ba2Ti9O20 ceramics
• 刊名：Procedia Engineering
• 出版年：2012
• 期刊代码：P56_18777058
• 类别：et
• 出版时间：2012
• 卷：36
• 期：Complete
• 页码：496-503
• 文件大小：332 K

摘要

In this study, the effects of microwave sintering on the sintering behaviour, the microstructure and the silver diffusion of Ba₂Ti₉O₂₀-based multilayer ceramic capacitors (BT MLCCs) with 95Ag-5Pd electrodes were investigated. The energy dispersive spectroscopy results showed that the silver ions diffused into the dielectric layer significantly when BT MLCC was sintered directly up to 940 掳C (conventional sintering). However, BT MLCC was fired at 940 掳C using microwave sintering; it was found to effectively suppress silver ion diffusion into the dielectric layer. According to the EDS analysis, the concentration of Ag in the Ba₂Ti₉O₂₀-based dielectrics using microwave sintering is below 0.4 at.%, whereas the use of conventional sintering results in an Ag ion concentration of approximately 2.3 at.%. The result for this may be due to different sintering kinetics between conventional and microwave sintering. To prove the effect of silver ion diffusion on the insulation resistance of BT MLCCs, the insulation resistance under different sintering conditions was measured at 85 掳C and 95%relative humidity atmosphere. The insulation resistance of BT MLCCs with conventional sintering was degraded obviously, which was compared with that with the microwave sintering.