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Thermomechanical Finite Element Techniques in LTCC Package Design
Keywords: LTCC, Thermomechanical, Finite Element
Critical in the robust design of any LTCC (low temperature co-fired ceramic) pkg is the thermal expansion mismatch that takes place during brazing between the metal components and ceramic substrate. This general expansion mismatch produces residual tensile thermal strain in the ceramic that, depending on the severity, can lead to premature component failure. In the present work, the finite element method (FEM) has been utilized as a convenient tool for investigating the design choices that minimize this effect. However, as with any computational tool, proper implementation of the technique must address a host of technical issues such as: i. Temperature dependent material property characterization. ii. Fine detail stress analysis resolution by implementation of submodeling technique. iii. Statistical nature of failure in brittle materials via CARES (Ceramics Analysis and Reliability Evaluation of Structures) design software. iv. Experimental validation of results. These issues will be discussed in the broader context of LTCC package design allowing the audience to gain a general understanding of FEM and its application. It will also be emphasized how the finite element technique can be used to expedite the entire package design process thereby eliminating costly “build and test” scenarios.
Mark Eblen, R&D Program Manager
Kyocera America, Inc
San Diego, CA

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