NONLINEAR ACOUSTIC EFFECTS IN MULTILAYER CERAMIC CAPACITORS

被引:5
作者
Johnson, W. L. [1 ]
Kim, S. A. [1 ]
Quinn, T. P. [1 ]
White, G. S. [1 ]
机构
[1] NIST, Div Mat Reliabil, Boulder, CO 80305 USA
来源
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A AND 32B | 2013年 / 1511卷
关键词
Barium Titanate; Ferroelectric Ceramics; Microcracks; Multilayer Ceramic Capacitors; Nonlinear Acoustics; Resonant Acoustics; Thermal Stress; QUALITY INSPECTION TOOL;
D O I
10.1063/1.4789214
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nonlinear resonant acoustics was explored as an approach for nondestructively evaluating the susceptibility of BaTiO3-based multilayer ceramic capacitors to electrical failure during service. The acoustic nonlinearity was characterized through measurements of the dependence of the frequency of a selected dominant mode near 1.16 MHz on driving amplitude, employing direct ferroelectric tone-burst transduction, time-domain signal acquisition, and frequency-domain spectral analysis. Finite-element modeling and consideration of the symmetry of the excitation led to identification of the selected mode as the lowest-order extensional mode. Measurements as a function of the number of thermal treatments (of two types) provided evidence for increases in acoustic nonlinearity arising from thermal-stress-induced material damage. No evidence for further systematic changes in nonlinearity was found after nine heat treatments. Signals and analysis for some samples were complicated by the emergence of a second resonance in the waveforms and an apparent reduction in acoustic nonlinearity as a function of time under DC bias. The second of these effects is suggested as being associated with changes in nonlinear elements of the material (presumably, microcracks) that arise from interactions of internal stresses during domain reorientation.
引用
收藏
页码:1462 / 1469
页数:8
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