金屬/陶瓷界面工程:介電陶瓷與金屬電極之接著強度研究

Abstract

本論文是研究金屬與陶瓷界面的機械強度性質，陶瓷是使用商用鈦酸鋇粉，金屬部分為銀膏及鎳膏所製成的金屬膜，膜的成型方是為網版印刷法。使用不同表面性質的緻密鈦酸鋇做為基板，金屬膏覆蓋在陶瓷基板上並在不同溫度下燒結，試片加工製成特殊形狀以符合Blister test的試片形狀要求。 Blister test可以得到量化的介面強度，並可由此得出介面裂縫延伸的所需的能量，在實驗過程中會伴隨著塑性變形，在本實驗中我們提出一個簡單的處理方法以減去塑性變形的影響。在不同銀膠燒結溫度下，銀及鈦酸鋇的界面強度落在4 -7 J/m2 之間，鎳及鈦酸鋇的界面強度約為1 J/m2。 本實驗中嘗試發展三種 indentation 方法來量測相同的金屬與陶瓷界面的強度，經由 normal及 interface indentation 所得出的銀與碳酸鋇的界面強度約為 0.5 J/m2. 第三種測試方法Cross-sectional indentation test 為本研究中發展出的全新測試方法，並提出一種新的理論分析。依照不同的分析模型，所得出的銀與碳酸鋇的界面強度約為 1到3 J/m2.

The present study investigates the mechanical strength of metal/oxide interface. Ceramic was commercial available BaTiO3. Silver and nickel pastes are used as the metal materials. The metal film was prepared by screen-printing. Specimens with Ag or Ni layer, fabricated at different sintering temperatures, covering dense BaTiO3 substrates with different surface roughness have been prepared with a special geometry appropriate for blister and indentation testing. The blister test technique allows numerical estimation of interfacial adhesion strength through determination of the interfacial crack propagation energy. A simple method is proposed to correct for generalized plastic straining of silver layer. The average value of Ag/BaTiO3 adhesion strength ranges from 4 J/m2 to 7 J/m2 according to the firing temperature of Ag. For Ni film fired at 1200°C for 2 h on dense barium titanate, the average value is about 1 J/m2 Three indentation tests are developed to measure critical energy release rate of the same metal/oxide interfaces. The average Gci of Ag/BaTiO3 interface is about 0.5 J/m2 according to normal and interface indentation tests. Cross-sectional indentation test has been also successfully performed and a new model for analysis of its results is developed. The average Gci of Ag/BaTiO3 interfaces are obtained from 1 J/m2 to 3 J/m2 according to the models.