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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Johnson, W.L. Kim, S.A. White, G.S. Herzberger, J. |
| Copyright Year | 2014 |
| Description | Author affiliation: Nat. Inst. of Stand. & Technol., Boulder, CO, USA (Johnson, W.L.; Kim, S.A.; White, G.S.) || Dept. of Mech. Eng., Univ. of Maryland, College Park, MD, USA (Herzberger, J.) |
| Abstract | Measurements of resonant ultrasonic frequencies of multilayer ceramic capacitors (MLCCs) were performed as a function of excitation amplitude to assess the potential of nonlinear acoustic methods for sensing the presence of cracks. The ultimate objective of this work is to establish an approach for nondestructively screeningMLCCs for susceptibility to failure that arises from the evolution of structural flaws into electrical pathways during service. Direct ferroelectric tone-burst transduction and time-domain signal analysis were used to measure the frequency of an extensional mode near 1 MHz in $BaTiO_{3}-based$ MLCCs with interleaved Ag electrodes. The capacitors were subjected to thermal stress by quenching from 189 °C into ice water, which led to generation of visible surface-breaking cracks in a fraction of the MLCCs. The amplitude dependence of the resonant frequencies was found to be strongly correlated with the presence of visible cracks. |
| Starting Page | 244 |
| Ending Page | 247 |
| File Size | 774535 |
| Page Count | 4 |
| File Format | |
| e-ISBN | 9781479970490 |
| DOI | 10.1109/ULTSYM.2014.0062 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-09-03 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Resonant frequency Frequency measurement Acoustics Capacitors Acoustic measurements Ceramics Heat treatment |
| Content Type | Text |
| Resource Type | Article |
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