Metal/Ceramic Interface Engineering: Adhesion Strength Measurement between Dielectric Ceramic and Electrode Metals
博士 === 臺灣大學 === 材料科學與工程學研究所 === 95 === 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, fa...
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| Format: | Others |
| Language: | en_US |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/40054970050171665722 |
| Summary: | 博士 === 臺灣大學 === 材料科學與工程學研究所 === 95 === 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.
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