(北京科技大學(xué) 腐蝕與防護(hù)中心， 北京 100083)
摘 要: 分別在550、 650、 750和950 ℃的燒結(jié)溫度下制備陶瓷電容器賤金屬鎳電極。 研究了燒結(jié)溫度對鎳電極附著力和方阻的影響，分析了不同燒結(jié)溫度下鎳電極的微觀組織和成分， 揭示了鎳電極致密化過程的本質(zhì)。 結(jié)果表明， 隨著燒結(jié)溫度的增加， 鎳電極附著力逐漸增大， 方阻逐漸下降； 燒結(jié)溫度是影響鎳電極致密化過程的重要因素， 950 ℃時形成了連續(xù)、 致密的三層結(jié)構(gòu)電極， 中間層與鎳電極附著強(qiáng)度相關(guān)； 鎳電極的致密化過程分為液態(tài)玻璃的生成、 鎳粉顆粒的溶解-析出和固相骨架的形成3個階段。
關(guān)鍵字: 鎳電極； 陶瓷電容器； 致密化； 燒結(jié)溫度
in ceramic capacitors
MENG Hui-min， YU Hong-ying
（ Beijing Center for Corrosion and Protection,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract: The Ni base metal electrodes in ceramic capacitors were prepared at sintering temperature of 550, 650, 750 and 950 ℃, respectively. In order to elucidate the densification process mechanisms of Ni electrodes, the effects of sintering temperature on the adhesion and square resistance of Ni electrodes were studied, and the microstructures and compositions of Ni electrodes at various sintering temperatures were analyzed. With the increase of the sintering temperature, the adhesion force of Ni electrodes enhances, and the square resistance decreases. The SEM and EDS results show that the sintering temperature has a significant effect on the densification process of Ni electrodes. A continuous and compact electrode with the three-layer structure is formed at 950 ℃, and the adhesion strength of Ni electrodes is dependent on the middle layer. The densification process of Ni electrodes include three stages, such as the formation of liquid glass, the dissolution and precipitation of Ni particles and the formation of solid framework.
Key words: Ni electrode; ceramic capacitor; densification; sintering temperature
